EVALUATION OF THE CHROMATIC INDUCTION INTENSITY ON MUNKER-WHITE SAMPLES

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1 DAAAM INTERNATIONAL SCIENTIFIC BOOK 2008 pp CHAPTER 41 EVALUATION OF THE CHROMATIC INDUCTION INTENSITY ON MUNKER-WHITE SAMPLES MILKOVIC, M.; MRVAC, N. & BOLANCA, S. Abstract: Systems of parallel lines which are similar or even equal to Munker- White s samples in their shape are used in different designer s solutions. Many of these solutions become the samples which have to be reproduced in some defined cases with great degree of exactness. However, because of the manifestation of the determined psychophysical effects the usage of such line systems can cause potential aberration in the perception of the desired colour of particular elements of the reproduced samples. The changes in colour perception on Munker-White s samples appear as the consequence of the geometrical structure in combination with the psychophysical visual effects of chromatic induction and assimilation. In this sense the experimental investigations are directed so that they enable the determination of the influence of particular standard rendering methods on the magnitude of the most intensive effect which is manifested on different types of Munker-White s sample, i.e. the effect of chromatic induction. Key words: Munker-White s effect, chromatic inductions, ICC rendering mehtod Authors data: Dr. Milkovic, M[arin]*; Prof. Mrvac, N[ikola]**; Dr. Bolanca, S[tanislav]***, *Graficki zavod hrvatske, M.Resetara 44, 10000, Zagreb, HR, **Faculty of Graphic Arts, Desno Sredicko 2a, Lasinja, HR,*** Faculty of Graphic Arts, Getaldiceva 2, 10000, Zagreb, HR, marin.milkovic@gzh.hr, mrvac@grf.hr, stanislav.bolanca@grf.hr This Publication has to be referred as: Milkovic, M[arin]; Mrvac, N[ikola] & Bolanca, S[tanislav] (2008). Evaluation of the Chromatic Induction Intensity on Munker-White Samples, Chapter 41 in DAAAM International Scientific Book 2008, pp , B. Katalinic (Ed.), Published by DAAAM International, ISBN , ISSN , Vienna, Austria DOI: /daaam.scibook

2 Milkovic, M.; Mrvac, N. & Bolanca, S.: Evaluation of the Chromatic Induction 1. Introduction Although the CIE L*a*b* colour model enables very strict calculation of the colorimetric difference ( E*), and ensures the correlation among the brightness, chromaticity and hue, it can not predict and specify the influences connected with a series of the psychophysical effects. First of all it is thought on the ambient adaptation effects (chromatic and light adaptation), then on the influence of the series of background effects (simultaneous, successive and complementary contrast, spreading, crispening, etc.) and the influence of geometrical-structural adaptation effects which appear in some types of image presentation (Fairchild, 2005). Because of the mentioned influences, in spite of standardized ICC rendering methods (ICC, 2003) the need of introduction the additional rendering methods is supposed (Morovic, 2008), which will not directly lean on the basic colorimetry. The Munker White s samples are basically chromatic versions of White s samples, from which it originates that geometrical structure, and not the colour of the samples is the primary factor which determines the existence of the effect itself, while the intensity of experience is determined by the combination of pairs of colours, which cause effect manifestations of the chromatic induction. That is, the choice of colour lines and their mutual relations determine the intensity of the effects, but they are not decisive for existing of the effect. With regard to the fact that the change of colour perception on Munker-White s samples is caused among other thing by chromatic induction, i.e. assimilation, it can be supposed that the intensity of the effect will increase with the increase of contrast among the chosen colour pairs or colour combinations. In accordance with the previously mentioned facts, two specific groups of Munker White s samples were created for the needs of evaluation of the intensity of the chromatic induction effect. Together with the segment for instrumental analysis, the samples are produced by standard rendering methods with the digital printing machine on the principle of the liquid toner. The main aim of the experiment was to investigate the influence of particular standard ICC rendering methods on intensity manifestation of the chromatic induction effect, as well as to determine the potential differences in the intensity manifestation of the mentioned effect for different investigated colour combinations of Munker-White s sample. 2. Design of the Printing Form for the Reproduction of Samples In accordance one the set investigation aims, the test form made of two main parts was created: a part for the instrumental analysis and one part for visual evaluation. The part for the instrumental analysis (Heidelberg Print-Open 4-color Standard Test chart (left part of the Figure 1.) is composed of 210 patches of different colour combinations of subtractive synthesis, generated by vector graphics in the steps of 5% screen value. The mentioned part is assigned for 486

3 DAAAM INTERNATIONAL SCIENTIFIC BOOK 2008 pp CHAPTER 41 spectrophotometric analysis and the calculation of volume and geometrical characteristics of gamut of the belonging reproductions. The part for visual evaluation is divided in two groups of Munker White s samples. Each has six different combinations of colour pairs (total 12 samples, with the size 5 x 10 cm). The first group of six different Munker White s samples is designed in the way that beside the black colour of the outer grid and the classic blue colour of the inner lines (which are induced), the other primary colours of the additive synthesis as well as all the primary colours of the subtractive synthesis were used. In accordance with the described idea, the Munker White s samples with the following colour combinations were designed: black blue, black green, black red, black cyan, black magenta and black yellow. The other group of six different Munker White s samples was designed in the way that the colours of the outer grid were complementary to the colours within the lines which were induced. The first three combinations of pairs were created so that the outer grid was represented by the primary colours of the subtractive synthesis and the inner lines which were induced were performed by the complementary colours of the additive synthesis. The next three combinations of colour pairs were inversely crated, i.e. the outer grid was represented by the primary colours of additive synthesis and the inner lines which were induced were their complementary colours of the subtractive synthesis. The samples of both mentioned groups were created in the way that they enabled the determination of the intensity of the chromatic induction of the primary colours in the process of graphic reproduction, i.e. the primary colours of the additive synthesis and the primary colours of the subtractive synthesis, as well as the determination of the intensity change of the chromatic induction regarding the influence of particular standard rendering method. Fig. 1. Presentation of the test form used in the investigation of effect of chromatic induction on Munker White's samples 487

4 Milkovic, M.; Mrvac, N. & Bolanca, S.: Evaluation of the Chromatic Induction 3. Exprimental Part 3.1. Reproduction of test templates The test from was recorded as PDF file format in CMYK colour space and it was printed on the calibrated digital printing machine with liquid toner, with the resolution of 1200 dpi and the usage of standard ICC rendering methods in the edition of 10 examples for each rendering method. The glossy fine art paper was used as the printing form, with high whiteness (expressed in CIE L*a*b* by the values: L* = 94.4, a* = 0.2 and b* = 0.2) and the grammage of 175 g/m 2. Before the printing process, the paper was conditioned for 48 hours according to the prescribed standard ambient conditions (temperature of 23 0 C and relative humidity of 55%) Instrumental analysis Measurements of samples from the part for instrumental analysis (Standard Print-Open test form) was performed with X-Rite DTP 41 reflection spectrophotometer, in the wavelength range from 390 to 710 nm, light source D50, and the steps of 10 nm and the illumination geometry of 45 0 /0 0. With the aim to increase the static exactness of the instrumental analysis, the values of the control patches were measured in edition of 10 samples for each rendering method. Each sample was measured twice, after which the average values were calculated. The exactness of the instrument, i.e. the average aberration in the sense of reflectance was 0.5% per wavelength step. Standard measure for calibration was made in Munsel s laboratory (RIT) with the exactness E*=0.25 for the light source D50 and the observation angle 2 0. On the basis of the spectrophotometric measurements, after conversion from CIEXYZ colour space (the output data of the instrument X-rite DTP41) in CIE L*a*b* value, by using the application Monaco GamutWorks, the volumes of gamut were calculated and the visual 2D and 3D gamut models of particular prints were made Visual evaluation The evaluation of the intensity effect of the chromatic induction for each 12 Munker-White s samples was performed in two separated series of visual evaluation for each of the standard rendering methods by applying the simultaneous binocular coordinating method. The tested stimuli in the mentioned technique of visual evaluation were in close proximity, at the same time in the whole field of sight, at which the evaluation was done simultaneously by comparison among the tested samples (Braun et al. 1996). The testing was performed at the Chair for Printing at the Faculty of Graphic Arts, University in Zagreb with the group of 18 examinees, mixed population, of the average age of 21 years. All the examinees satisfied the criteria of Ishihara test (of 24 samples) for the detection of potential visual anomalies. The ambient conditions of the space for visual evaluation were in accordance with the directions of the standard ISO 2664 from year 2000 (for the evaluation by 488

5 DAAAM INTERNATIONAL SCIENTIFIC BOOK 2008 pp CHAPTER 41 atlas) i.e. ISO from 2004 (for visual colorimetric experiment). The evaluation time in both estimation processes was not limited. The first series of the performed visual evaluation was based on the estimation of aberration among the stimuli and inner lines of the Munker-White s grid with the method which, according to its classification and criteria, would correspond to the method of constant stimuli. A set of different stimuli with the predefined unchangeable values was presented to the examinee according to random sample. The values of stimuli were chosen to cover the total potential area of threshold perception so that the smallest stimulus value was little under the expected perception threshold and the greatest was somewhat above the perception threshold. The aspiration was to choose the values which were considered to be nearest the evaluated stimulus (Kamtowitz B.H. et al. 2008). The described method was adapted to the specific characteristics of investigations performed in this work. For the needs of evaluation, the atlas with different variations of the primary colours of additive and subtractive synthesis was created. Each primary colour was presented in the atlas with 120 variations. Colour samples on atlas for each analysed colour have been selected on the principle that they should cover all predicted values. Fig. 2. Presentation of the atlas segment The first 26 samples of primary colours (Y, M, C, R, G, and B) of atlas (Figure 2) were designed as linear decreasing values of brightness (HSB colour model) in steps of 3% (in the range from 100% to 22%). The last four patches of each colour were not defined by changes of brightness value but as linear decreasing screen values in steps of 5% (in the range from 95% to 80% screen value). That means that each colour among the primary colours was given in variations of 30 different samples (26 + 4). The reason for atlas design with the described characteristics of patches is more understandable when the created Munker-White s samples are studied in details 489

6 Milkovic, M.; Mrvac, N. & Bolanca, S.: Evaluation of the Chromatic Induction (Figure 1). At the first sight already, it was noticeable that the change of colour appearance caused by chromatic induction or assimilation on given samples was perceived primary as the change of brightness of the primary stimulus (lines which were induced) and less as the change of tone or saturation. In the order to create colour samples on atlas, which would be as much as possible similar to the tested Munker-White s samples (whose characteristics were determined mostly by the application of the rendering method), the earlier described 30 basic samples of the particular primary colour were reproduced with four standard rendering methods, which gave the final number of 120 samples for each primary colour. The described atlas was printed on equal printing substrate, on the same digital printing machine as the tested samples. By spectrophotometric measurement (with X-Rite DTP41 device) the belonging CIE L*a*b* to each of the colour sample from the atlas values were given. The process of the evaluation the relationship among the stimuli was based on the process of visual detection and recognition. The task of each examinee was the identification of sample in colour atlas (constant stimulus) which according to his/her evaluation was the most similar (or equal) to the tested sample which was presented by the inner lines of the Munker- White s grid (Figure 3). Fig. 3. Presentation of the visual evaluation principle by atlas By assigning the reference sample from colour atlas (it was performed for both systems of inner lines regarding the background and surroundings) the tested sample got the perceived colorimetric values (CIE L*a*b* values). If, after the performed visual evaluation, the three dimensional geometrical colour difference E*ab was calculated from the belonging assigned colorimetric values we get the aberration value in colour perception which was caused by the manifestation of the effect of chromatic induction would be got. In the second series of visual evaluation, the aberration estimation among the stimuli of inner lines of Munker White s grid (which was induced) was performed 490

7 DAAAM INTERNATIONAL SCIENTIFIC BOOK 2008 pp CHAPTER 41 by the process which, according to its psychophysical classification and criteria, would correspond to the method of adjusting. During the experiment based on the adjusting method the examiner set the device for stimuli control to the determined starting value. The task of each examinee was to set the same device to the value which caused the demanded perceptual reaction e.g. equality (Norton et. al., 2002). The evaluation process was chosen by means of the mentioned method in the second series of the visual evaluation because the method enabled the direct interactive evaluation of the stimulus characteristics by the examinee and because of that it was considered to be the most correct one. The process of visual evaluation was based on the investigation study of the Department for Physics at Stockholm University under the leadership of Pehr Sällström at the end of (Sällström, 1998). The mentioned study describes the possibilities of the usage of PC and their calibrated screens with the aim of evaluating the colour values with the process which is very similar to the classical visual colorimetric experiment. The condition for using the computer screen as a medium in visual colorimetric experiment was that its gamut was greater than the gamut of a medium whose colours were compared. In accordance to the mentioned Sällström s study the visual evaluation of the inner lines of Munker-White s samples was performed on the calibrated computer screen by means of the tool Visual colorimeter from the application X-rite ColorShop. Before the beginning of the visual evaluation the examiner adjusted the initial values of the colorimeter depending on the primary stimulus colour which was evaluated. The initial values of the colorimeter were the values of stimulus measured on the belonging samples reproduced by the tested rendering methods. Stimulus colour Rendering method Perceptual Saturation Rel. Colorim. Aps. Colorim. L* a* b* L* a* b* L* a* b* L* a* b* Yellow Magenta Cyan Red Green Violet-blue Tab. 1. Referential L*a*b* values of the primary stimuli of Munker-White s samples measured on reproduction in dependence on the applied rendering methods. The aim of the examinee was (the same as in the classical visual colorimetric experiment) to set the values of three primaries of additive synthesis E, G and B (left column Figure 4) on the computer screen by means of the tool Visual 491

8 Milkovic, M.; Mrvac, N. & Bolanca, S.: Evaluation of the Chromatic Induction colorimeter, so that the colour experience realized by their total values gave perception equal to the tested sample on print. Fig. 4. Presentation of the working interface of the tool Colorimeter When by adjusting the primaries R,G and B the examinee realized his experience equal to the one perceived by looking at the tested stimuli on the reproductions of Munker-White s samples, the obtained values were noted into the table of the measured results as CIE L*a*b* sizes (Figure 4. medium column). By determining the colorimetric difference E* among the reference values of colour from the original record (before the reproduction process) with the values measured by the instrument after the reproduction process with the application of the standard rendering methods (Table 1), the values showing the exactness of the transformation process and gamut mapping were obtained. By comparing the values of the primary colours measured instrumentally on the reproduction with the values obtained by the described visual colorimetric experiment the intensity of manifested effects of the chromatic induction and assimilation in dependence on the applied rendering method was determined. The values obtained by the second series of the visual evaluations were not absolute because the process of visual colorimetric evaluation over the PC was not completely reliable, and also, because the process of visual evaluation was based on cross-media synchronizing (computer monitor print). In spite of that the obtained results enable the determination of the manifestation magnitude of the investigated effects on particular sample (in dependence on the chosen colour combination and/or regarding the applied rendering method). It was also expected that the results obtained by another series of visual evaluation would enable the confirmation of the determination results of the investigated effects collected in the first series of visual evaluations. The usage of the two separated (by the principle of determinations the effect intensity) different methods of visual evaluation, enabled the view of the characteristics of the investigated effect during their manifestation in everyday designers solution in the technological processes which were performed in printing technology on different media (changes caused by the application of different media). 4. Results Based on the results obtained by spectrophotometric measurements from the segments of the test for made the instrumental analysis, after the performed belonging 492

9 DAAAM INTERNATIONAL SCIENTIFIC BOOK 2008 pp CHAPTER 41 conversions, by means of the application Monaco GamutWorks the gamut volumes of prints made by standard rendering methods were calculated. (Table 2, Figure 5). Rendering method Gamut volume (CIE L*a*b* CCU) Perceptual Saturation Relative colorimetric Absolute colorimetric Tab. 2. Relation between the rendering method and belonging gamuts Fig. 5. Two dimensional gamut presentation made by applying the standard rendering methods in CIE L*a*b* colour space for the brightness value L*=50 (only the figure) In table 3 the relation of the colorimetric colour differences (ΔE*) among the values of the primary stimuli of the original not reproduced record and the belonging values realized on the reproduction in dependence on the applied rendering methods is presented, which in fact shows the exactness of the transformation process and the gamut mapping (if the exactness is decisive criterion). Stimulus Original record E* Reproduction colour L* a* b* Perceptual Saturation Rel. Col. Abs. Col. Yellow Magenta Cyan Red Green Blue Tab. 3. Relation of L*a*b* values of the original record and E* reproductions 493

10 Milkovic, M.; Mrvac, N. & Bolanca, S.: Evaluation of the Chromatic Induction With the application of Monaco GamutWorks the constructions of the original records of gamut and their reproductions within the CIE L*a*b* colour space were performed. Figures 6 and 7 present the positions of the characteristic colours of the original not reproduced record of the test form in CIE L*a*b* colour space (for four viewing angles: 0 0, 90 0, and ). Fig. 6. Three dimensional presentation of the characteristic colour position of the original test form record (not reproduced) in CIE L*a*b* colour model for the viewing angles 0 0 (left) and 90 0 (right) Fig. 7. Three dimensional presentation of the characteristic colour position of the original test form record (not reproduced) in CIE L*a*b* colour model for the viewing angles (left) and (right) In tables 4 9 the results of visual evaluation are presented. Regarding the limited work scope the values of L*a*b* are not presented in tables, only the comparative presentation E* of the obtained by the classic visual colorimetric experiment, i.e. by evaluation by means of atlas for different combinations. 494

11 DAAAM INTERNATIONAL SCIENTIFIC BOOK 2008 pp CHAPTER 41 atlas. K* - classical visual colorimetric experiment, A* - evaluation by means of Rendering method / Type of evaluation Colour of lines of the outer grids Perceptual Saturation Rel.Colorimet. Abs.Colorimet. K* A* K* A* K* A* K* A* Cyan 6,21 5,82 9,12 8,81 7,28 6,94 7,69 7,38 Black 6,71 6,26 9,67 9,32 7,56 7,25 7,84 7,62 Tab. 4. Average E* values of the visual estimation results of Munker-White's samples created with red lines which are induced by black, i.e. in another case -with the complementary cyan lines of the outer grid at different rendering methods. Colour of lines Rendering method / Type of evaluation of the outer Perceptual Saturation Rel.Colorimet. Abs.Colorimet. grids K* A* K* A* K* A* K* A* Magenta 5,73 4,11 6,15 5,18 7,82 6,32 6,54 5,73 Black 5,25 4,51 6,67 6,36 8,45 6,87 6,63 5,25 Tab. 5. Average E* values of the visual estimation results of Munker-White's samples created by green lines which are induced by black, i.e. in another case with the complementary magenta lines of the outer grid at different rendering methods. Colour of lines Rendering method / Type of evaluation of the outer Perceptual Saturation Rel.Colorimet. Abs.Colorimet. grids K* A* K* A* K* A* K* A* Yellow 6,25 6,03 9,24 8,99 6,94 6,89 7,48 6,25 Black 6,45 6,16 9,20 9,06 7,22 7,02 7,72 6,45 Tab. 6. Average E* values of the visual estimation results of Munker-White's samples created by blue lines which are induced by black, i.e. in another case with the complementary yellow lines of the outer grid at different rendering methods. Colour of lines Rendering method / Type of evaluation of the outer Perceptual Saturation Rel.Colorimet. Abs.Colorimet. grids K* A* K* A* K* A* K* A* Red 5,40 4,0 7,70 5,62 6,96 6,42 7,08 6,30 Black 6,19 4,70 8,44 7,55 7,40 6,75 7,56 6,51 Tab. 7. Average E* values of the visual estimation results of Munker-White's samples created by cyan lines which are induced by black, i.e. in another case with the complementary red lines of the outer grid at different rendering methods. 495

12 Milkovic, M.; Mrvac, N. & Bolanca, S.: Evaluation of the Chromatic Induction Colour of lines of the outer grids Rendering method / Type of evaluation Perceptual Saturation Rel.Colorimet. Abs.Colorimet. K* A* K* A* K* A* K* A* Green 5,97 4,25 8,76 8,37 6,71 6,08 7,37 7,07 Black 6,17 5,47 9,17 9,66 7,10 6,48 7,83 7,62 Tab. 8. Average E* values of the visual estimation results of Munker-White's samples created by magenta lines which are induced by black, i.e. in another case with the complementary green lines of the outer grid at different rendering methods. Colour of lines of the outer grids Rendering method / Type of evaluation Perceptual Saturation Rel.Colorimet. Abs.Colorimet. K* A* K* A* K* A* K* A* Blue 5,97 4,25 8,76 8,37 6,71 6,08 7,37 7,07 Black 6,17 5,47 9,17 9,66 7,10 6,48 7,83 7,62 Tab. 9. Average E* values of the visual estimation results of Munker-White's samples created by magenta lines which are induced by black, i.e. in another case with the complementary blue lines of the outer grid at different rendering methods. 5. Results Discussion and Conclusion By observing the results of instrumental analysis, i.e. the presentation of three dimensional gamut constructions of the original record, it is visible that in all four rendering methods of the original record the changes, in order to come into the volume area of the reproduced gamuts, were reproduced. That is, gamut of the original record is considerably greater than all realized reproduction gamuts. The mentioned shifts of the controlled tones realized by the transformation process and by mapping are expressive at the perceptual rendering method, somewhat lesser at the saturation method and the least ones at the colorimetric rendering methods. The greatest gamut volumes (expressed in CIE L*a*b* CCU) are realized by the application of colorimetric rendering methods (Absolute and Relative). They are followed by the saturation method, while the smallest gamut model is realized by the application of the perceptual rendering method. The greatest colorimetric aberrations in relation to the original record were estimated in saturation rendering method ( E* ranges from 14 to 43 for cyan). Perceptual rendering method follows with much lower colorimetric aberrations, while the smallest aberrations are, in accordance with the expectations, in rendering methods in which the exactness is the primary demand, i.e. in relative and absolute colorimetric rendering method. Although the aberrations in saturation rendering method are at first sight high, they are not surprising, i.e. they are in accordance with the demands for realization 496

13 DAAAM INTERNATIONAL SCIENTIFIC BOOK 2008 pp CHAPTER 41 the preferred and wanted reproduction according to Hunt s classification from 1987, whose fulfilling is subjected to the saturation method (Hunt, 2004). According to the previously mentioned, it can be concluded that the order of the realized gamut volumes and the order of colorimetric aberration values in regard to the original are expected and they are in accordance with the general postulates of the characteristics for which the particular rendering methods are intended (ICC, 2003). The results of visual investigations collected in tables (4 9) through the colorimetric difference ( E*) show indirectly the strength of psychophysical effect. In this sense, these results, opposite to the majority of the previous ones which detected the existence of the effect of chromatic induction on Munker-White s samples speak about the strength of the effect itself and they enable putting it into the gamut volume correlation and the rendering methods. From them, is also visible that in the evaluated samples by the application of the classical visual colorimetric experiment, greater aberrations appeared (colorimetric differences among the evaluated stimuli) in relation to the aberrations determined in evaluation by atlas, and the results were corresponding. The mentioned relations among the results of these two series of visual evaluations would be observed in the end and evaluated with the psychophysical methods they are based on. The more exact results are realized by classical visual colorimetric experiment based on psychophysical adjusting method because of the possibility to control particular attributes in the evaluation process of the aimed characteristics in relation to the evaluation made by atlas which is based on the method of constant stimuli and the possible values of the results (Norton et al., 2002). It is visible that there is, to a large extent, the change in chromaticity and brightness and to the small extent the change in tone. Particular aberrations from the mentioned rules (in both processes of visual evaluations) were noticed only at samples created by cyan inner lines and realized by colorimetric rendering method. The change is mostly expressed in tone on the mentioned samples. If the results of visual evaluation are primarily analysed regarding the particular kinds of Munker-White s samples, i.e. if the values of colorimetric aberrations among the groups is observed, it is visible that somewhat greater intensity of the manifested effect in the second group of samples which is composed of classic samples whose outer lines were made by black colour is realized. If the relation among the intensity of the manifestation of the tested effect and the characteristics of the reproduction gamut regarding particular rendering methods is set the following relations are got: Ord. Order of the effect intensity of the number chromatic induction Order of gamut size 1. Saturation Abs. Colorimetric 2. Abs. colorimetric Rel. Colorimetric 497

14 Milkovic, M.; Mrvac, N. & Bolanca, S.: Evaluation of the Chromatic Induction 3. Rel. Colorimetric Saturation 4. Perceptual Perceptual Tab. 10. Comparison of the relations gamut size and the intensity of the manifested effect Taking into consideration the fact that the mentioned order of the manifested effect intensity does not follow the realized gamut sizes, it is possible to conclude that for the intensity size of the tested effects the choice of the line colour of the Munker- White s grid is more important than the physical characteristics of the gamut. Also with regard to different mapping methods (Milković, 2006) it is visible that the decrease in chromaticity in the reproduction in the mentioned rendering methods is followed by the decrease of effect intensity of the chromatic induction. In order to get the broader ideas about the possibilities of situation defining which could make the choice of particular standard rendering methods easier in the sense of predicting the manifestation of a particular psychophysical effect on the concrete samples, the extending of this investigation to other psychophysical effects is foreseen. 6. References Braun K.M., Fairchild M.D., Alessi,(1996). Viewing Techniques for Cross-Media Image Comparisons, Color Resarch and Application, 21 th ed. Issue 1, February 1996, Wiley InterScience, p. 6-17, ISSN Fairchild M.D. (2005). Color Appearance Models, Second Edition, John Wiley & Sons, ISBN , Cichester Hunt R.W.G., (2004.). The reproduction of Colour, John Wiley & Sons, ISBN , Cichester ICC Specification ICC:1: , File Format for Color Profiles, Revision of ICC 1: , International Color Consortium, Available from: Accessed: Kamtowitz B.H., Roediger III H. L., Elmes D. G. (2008): Experimental Psychology, Wadsworth Publishing, ISBN: , Belmont, California, United States Milković M., (2006). Evaluation of psychophysically determinated effects and methods of gamut redefinition, Dissertation, Faculty of Graphic Arts, Zagreb Morovic J., (2008). Color Gamut Mapping, John Wiley & Sons, ISBN , Cichester Norton T.T., Corliss D.A., Bailey J.E., (2002). The Psychophysical Measurement of Visual Function, Butterworth-Heinemann Press, ISBN-13: Woburn Sällström P., (1998). Using a Persona Computer as a Visula Colorimeter, Cern Libraries, USIP Report 98-09, Geneva, Available from: Accessed: