ICEpdf
  1. ICEpdf
  2. PDF-247

YCCK to RGB colour conversion produces images with green hue

          Details

          • Type: Bug Bug
          • Status: Closed
          • Priority: Major Major
          • Resolution: Fixed
          • Affects Version/s: 4.1.2
          • Fix Version/s: 4.1.3
          • Component/s: Core/Parsing
          • Labels:
            None
          • Environment:
            any

            Description

            A client has given us a set of PDF that have JPEG images that use the YCCK colour space. We also have quite a few PDF in our test suite. ICEpdf renders these images with a heavy green hue. The algorithms we to convert YCCK to RGB is from adobe but the converted image isn't very close to the benchmark.

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              Patrick Corless added a comment -

              I played around with several different variants of the YCCK to RGB algorithm with out much luck. To try and figure out what was going on I did some RGB colour grabs from the benchmark image and the image rendered in ICEpdf.

              As a result I was able to tweak the ratios of YCCK colour components used to make the RGB colours. I still have to run this though qa but from my test set the results look pretty solid. Marking as resolved for now.

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              Patrick Corless added a comment - I played around with several different variants of the YCCK to RGB algorithm with out much luck. To try and figure out what was going on I did some RGB colour grabs from the benchmark image and the image rendered in ICEpdf. As a result I was able to tweak the ratios of YCCK colour components used to make the RGB colours. I still have to run this though qa but from my test set the results look pretty solid. Marking as resolved for now.

                People

                • Assignee:
                  Patrick Corless
                  Reporter:
                  Patrick Corless
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                  • Created:
                    Updated:
                    Resolved: