Chapter 11. Preparing a Document for Prepress and Printing Delmar, Cengage Learning

Transcription

1 Chapter 11 Preparing a Document for Prepress and Printing 2011 Delmar, Cengage Learning

2 Objectives Explore color theory and resolution issues Work in CMYK mode Specify spot colors Create crop marks Create bleeds Save file as a PDF

3 Explore Color Theory and Resolution Issues Energy from the sun hits the earth in waves: X-rays Gamma rays Ultraviolet rays Visual light rays (white light)

4 Explore Color Theory and Resolution Issues White light broken down into seven distinct colors (as seen in a rainbow) Red Orange Yellow Green Blue Indigo Violet

5 Explore Color Theory and Resolution Issues Colors in visible spectrum can be broken into red, green, and blue (primary colors). Primary colors cannot be reduced Additive refers to the fact that the primary colors combine to produce other colors Red, green, and blue, when combined equally, produce white light True black is the absence of all light

6 Explore Color Theory and Resolution Issues White light

7 Explore Color Theory and Resolution Issues Subtractive primary colors Three things can happen when light strikes an object: Reflection when light bounces off the object Absorption when light is not reflected Transmission when light passes through an object

8 Explore Color Theory and Resolution Issues Depending on physical properties of object, varying amounts of light are reflected, absorbed, and transmitted. Red, green, and blue light not reflected in equal amounts. Color is based on percentages of red, green, and blue reflected, and the color that combination of light produces.

9 Explore Color Theory and Resolution Issues

10 Explore Color Theory and Resolution Issues Cyan, magenta, and yellow are called subtractive primary colors. Each is produced by removing or subtracting one of the primary colors completely. Overlapping all three pigments would absorb all colors.

11 Explore Color Theory and Resolution Issues Cyan is minus red Magenta is minus green Yellow is minus blue

12 Explore Color Theory and Resolution Issues Color printing uses the three subtractive primary colors plus black to produce a color image or tint. The standard color for paper is white. Cyan, magenta, and yellow are manufactured to be transparent. The color you see on a printed page is light reflected off the page.

13 Explore Color Theory and Resolution Issues The color of the printed image is reflected off the paper, not the inks

14 Explore Color Theory and Resolution Issues CMYK inks (process inks) are not perfect. Ability to transmit light not perfect. In theory, overlapping all three inks should produce black because no light would be reflected.

15 Explore Color Theory and Resolution Issues The image on the left was printed with only CMY inks Black inks add contrast and depth to image on the image on the right

16 Explore Color Theory and Resolution Issues Illustrator is a vector-based drawing program. Graphics you create are called vector graphics. Vector graphics are resolution independent because they are not comprised of pixels. You can resize vector graphics without any concern for quality.

17 Explore Color Theory and Resolution Issues You can convert vector graphics to bitmap graphics by a process called rasterization. Bitmaps are comprised of a rectangular grid of colored squares called pixels. Pixels is short for picture elements.

18 Explore Color Theory and Resolution Issues Images composed of pixels include: Scanned images Digital images Rasterized Illustrator graphics Enlarged view of eye shows pixels

19 Explore Color Theory and Resolution Issues The number of pixels in a given inch is referred to as the image s resolution. To be effective they must create the illusion of continuous tone.

20 Explore Color Theory and Resolution Issues Effective resolution refers to the resolution of a placed image based on its size in the layout. Relevant only to bitmap graphics because vector graphics do not have pixels.

21 Explore Color Theory and Resolution Issues If you enlarge a bitmap graphic, the same number of pixels must be spread over a larger space, reducing the effective resolution

22 Explore Color Theory and Resolution Issues DPI refers to dots per inch. PPI is the correct term for pixels per inch. LPI refers to the number of lines of halftone dots in a professionally printed image lpi is standard.

23 Explore Color Theory and Resolution Issues Standard resolution for bitmap graphics for Web images is 72 ppi. Standard resolution for bitmap graphics that will be printed is twice the LPI, usually 300 ppi for high-resolution graphics.

24 Explore Color Theory and Resolution Issues Resolution of laser printers is 600 dpi or 1200 dpi and is satisfactory for text and lines. A resolution of 2400 dpi is required to output quality images and blends.

25 Explore Color Theory and Resolution Issues Whenever you print artwork that has transparent objects such as those that have blending modes applied or opacities less than 100%, Illustrator flattens it. If you are unsatisfied with the look, rasterize it yourself to see if you get better results.

26 Work in CMYK Mode Color models are mathematical algorithms that computers use to calculate and manage the color displayed on a monitor. Color models are RGB, CMYK, HSB.

27 Work in CMYK Mode The color mode determines the color model used to display and print Illustrator documents. Two color modes offered in Illustrator: CMYK Color base for color printing RGB Color base for color in light-emitting devices such as TV or computer monitor, and is the result additive properties of red, green, and blue.

28 Work in CMYK Mode Color gamut refers to the range of colors that can be printed or displayed by a given color model. A good monitor can produce a color gamut of more than 16 million colors.

29 Work in CMYK Mode Spectrum of color viewed by human eye is wider than any man-made method for producing color. CMYK model substantially smaller than RGB model. Some colors you can see on monitor cannot be reproduced by CMYK printing process.

30 Work in CMYK Mode If working in RGB mode and choosing colors, Illustrator will warn you if a color is out-of-gamut and can t be printed. If image created in RGB mode and you convert to CMYK mode, Illustrator will automatically replace with closest CMYK counterparts.

31 Work in CMYK Mode This color is out-ofgamut Out-ofgamut warning icon CMYK color model is unable to reproduce the brightest and most saturated hues that you can see on your screen

32 Work in CMYK Mode Tints are colors that you print by mixing varying percentages of CMYK inks. Lightest colors produced with the smallest percentages of ink. Dragging sliders on the Color panel is referred to as specifying or mixing a color

33 Specify Spot Colors Printing is based on the four process colors CMYK, but not limited to them. Working with tints can have problems so designers and printers use non-process inks to solve problems. Color gamut of non-process inks are special premixed inks Non-process inks offer consistent color through document

34 Specify Spot Colors Non-process inks referred to as: Spot color: Refers to non-process inks print on spots on paper where process inks do not print Fifth color: Refers to non-process inks printed in addition to four process inks PANTONE color: Refers to a manufacturer of nonprocess inks PMS color: An acronym for PANTONE Matching System

35 Specify Spot Colors To load spot colors, use the Swatch Libraries menu to select range of color systems, including PANTONE, which appears as a separate panel.

36 Specify Spot Colors Outputting documents with spot colors When four color document is printed on printing press, each color is printed separately on its own plate. When document is printed with four colors and a spot color, the spot color requires its own plate.

37 Specify Spot Colors In Illustrator, all spot colors will automatically be converted to their process match unless you deselect the Convert to Process option in Separation Setup dialog box accessed in the Print dialog box.

38 Specify Spot Colors Spot colors are converted to their process match when separated

39 Create Crop Marks The trim size of a document refers to the size of the finished document. The document size is the trim size. Crop marks are short, thin lines that you can use to define areas of the page that you want be trimmed after the document is printed.

40 Create Crop Marks You can create custom-sized crop marks on the artboard by drawing a rectangle that is precisely the same size as the document s trim size. Click Effect on the Application bar, then click Crop Marks in the Illustrator Effects section of the menu.

41 Create Crop Marks Illustrator adds crop marks as effects. Like all effects, crop marks are listed on the Appearance panel.

42 Create Crop Marks

43 Create Crop Marks Once you ve created crop marks, you cannot directly select them to edit them. You must first expand the appearance to select and edit the crop marks. Click Object on the Application bar, then click Expand Appearance.

44 Create Bleeds Creating bleeds and safety guides A bleed element is artwork that extends to the trim. Build a bleed to extend artwork so that it exceeds the cropped area by a minimum of.125 inches.

45 Create Bleeds Artwork can bleed off any one or all four sides of the trim. Create a bleed object with Offset Path command. Or extend existing artwork off the artboard using the Move command for precision.

46 Create Bleeds All elements that aren t designed to bleed should be kept a minimum of.125" from trim edge..125" bleed

47 Save a File as a PDF PDF (portable document format) is one of the most common export formats for ing documents and printing high-res output. As a PDF, illustrator artwork is complete and self-contained including all placed graphics and fonts.

48 Save a File as a PDF You can make a PDF of your artwork using compression utilities to reduce the size of the file. This results in a low-resolution file, with lessened image quality, but is beneficial for ing to clients.

49 Save a File as a PDF You can modify compression and other settings in the Save Adobe PDF dialog box.

50 Save a File as a PDF When sending your PDF to a professional printer, you will not want to use compression settings, because you want the highest quality file possible.

51 Save a File as a PDF You can modify other settings in the Save Adobe PDf dialog box as well such as: Showing crop marks and printer marks Filename, date, time of creation Whether it is in the CMYK or RGB color space

52 Save a File as a PDF There are pre-defined presets you can choose. You can also create and save your own unique settings as a preset.

53 Save File as a PDF General settings that you can modify in the Save Adobe PDF dialog box.