Online Sensitometry for Digital Intermediate Calibration

Transcription

1 Online Sensitometry for Digital Intermediate Calibration Author Ujwal N. Nirgudkar Alfa Imaging Systems Pvt. Ltd. INDIA H.P.A.-2009

2 Motion Picture Film Laboratory Process Original Negative Processing Negative Scanning Color Management System Recording Digital Intermediate Digital Intermediate Processing Printing from D.I.Negative Positive Processing Print ready for Exhibition

3 Wet Processes-Uses Chemicals Original Negative Processing Negative Scanning Color Management System Recording Digital Intermediate Digital Intermediate Processing Printing from D.I.Negative Positive Processing Print ready for Exhibition

4 Quality Control by Sensitometry Original Negative Processing Negative Scanning Color Management System Recording Digital Intermediate Digital Intermediate Processing Printing from D.I.Negative Positive Processing Print ready for Exhibition

5 Consistency in Film Processing can be achieved using Sensitometry Let us understand SENSITOMETRY

6 Light Stopping Ability of a Sample

7 Opacity and Density

8 Typical Sensitometer Produced 21Step Wedge

9 Conventional Sensitometric Graph-Density v/s Exposure This Graph is known as D log E Curve H & D Curve(Hurter & Driffield) Log I*t Curve

10 Characteristic Curve for Black&White Film

11 Sensitometric Strip for Negative Processing Sensitometric Strip for Positive Processing As per current procedure These Strips are Processed at fixed intervals (1hr OR 2hr) & compared with Reference Strip for QC.

12 Machine Speed v/s Frequency Film Speed Ft/Min Frequency Frequency of Sampling reduces with increase in Machine Speed

13 Machine Speed v/s Frequency Sample Frequency Speed Ft / Min Frequency of Sampling

14 New Methods of Sensitometry

15 New Methods of Sensitometry Wedge should be Exposed by Film Manufacturer for Entire Film-stock

16 New Methods of Sensitometry Wedge should be Exposed On the Portion Between Sprocket-holes

17 New Methods of Sensitometry Wedge should be Exposed on the Opposite side Of Bar-code Registration

18 New Methods of Sensitometry Advantages Frequency of Sampling Increases from 1 to 3000

19 New Methods of Sensitometry Advantages Direct Link Between Bar-code & Densitometric Reading

20 New Methods of Sensitometry Advantages Enhanced Density Measurement Accuracy

21 New Methods of Sensitometry Advantages Easy Monitoring of Quality for Laboratories

22 New Methods of Sensitometry Advantages Savings in Cost & Time

23 New Methods of Sensitometry Advantages Easier Color Corrections

24 New Methods of Sensitometry Advantages Quality by Default and Not Quality by Choice

25 History of this Technology Chemical Engineer with 27 years experience in Filmlab in India, worked on SMPTE committees F-2 & L-6, & first SMPTE Fellow from India. This Technology was First Presented at SMPTE Technical Conference in Oct-2002 at Pasadena. U.S.Patent No, 6,849,366 granted on 1st Feb U.S.Patent No, 7,254,324 granted on 7th Aug.2007 Selected by Dept. of Science & Technology, Govt. of India for Incubation & Support in Alfa Imaging Systems Pvt. Ltd. was incorporated in April 2008 to promote this technology.

26 U.S.Patent 6,849,366 issued on 1 st Feb.2005

27 Who will benefit from this Technology 1)Online Sensitometry on Camera Negatives- Cinematographers / Studios 2)Online Sensitometry on Print Films- Laboratories 3)Online Sensitometry on Digital Intermediate- D.I.Facilities

28 1)Online Sensitometry on Camera Negatives- Cinematographers As the sensitometric readings are available on the Camera Negative itself,it gives a very good reference for Cinematographer Studios Get a right to know how their Negatives were processed

29 2)Online Sensitometry on Print Film- Film Laboratories Film Laboratories can easily monitor the quality of print processing around the world at different locations. As the sensitometry is online, the data can be scanned online & made available at one central location e.g. Hollywood, using a dedicated network.

30 3)Online Sensitometry on Digital Intermediates- D.I.Facilities What are the Benefits???

31 Online Sensitometry for Digital Intermediate Calibration

32 Fights between DI People & Lab People,over who went wrong

33 Fights between Digital Technology & Chemistry

34 We need consistency between Recording & Processing Image courtesy ARRI

35 Characteristic Curve for Black&White Film

36 Simulated Sensitometric Patches created for Digital Intermediate as DPX Files. These files were recorded in the soundtrack area along with the picture.

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41 What more we need??? 1)Scanner To scan these sensitometric Patches 2) Software To convert the readings in to meaningful actions

42 The New Patches can be also read separately on the Analyzer & R,G,B corrections can be easily applied for changes in D.I.Negative Processing. Image courtesy FILMLAB & RTI

43 If the Film Manufacturers also decide to use this technology(?) This is how the D.I.Negative will look in future.

44 Current Status of Technology 1)Protorype Ready 2)Scanner Manufacture Ready to tie-up 3)Software Manufacturer Ready to tie-up 4)Should be able to take a commercial trial in Hollywood in the next three months

45 Acknowledgements Thanks To

46 Acknowledgements Thanks to All Of You

47 Online Sensitometry for Digital Intermediate Calibration Ujwal N. Nirgudkar U.S.Cell- (323) Alfa Imaging Systems Pvt. Ltd. INDIA