ICEpdf
  1. ICEpdf
  2. PDF-1195

Problem decoding rgb bitpack colour model

          Details

          • Type: Bug Bug
          • Status: Closed
          • Priority: Major Major
          • Resolution: Fixed
          • Affects Version/s: 6.2.5
          • Fix Version/s: 6.3
          • Component/s: Core/Parsing
          • Labels:
            None
          • Environment:
            any

            Description

            The pdf in question contains several images that have a rgb colour model and one bit per color component. The images are not correctly decoded show up as black images.

              Activity

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              Patrick Corless added a comment -

              After quite a bit of debugging I was able to touch up an issue we had when decoding and assigning the colour values. Basically we get the rgb colour values by reading each bit and then Or and bit shift the results to get the colour. The problem is that we are getting bit values, zero or one and after the bit shift we end up with the wrong value. Each bit represent either 0 or 255 and thus the problem. Updated the code with some multiplication and all is good.

              Show
              Patrick Corless added a comment - After quite a bit of debugging I was able to touch up an issue we had when decoding and assigning the colour values. Basically we get the rgb colour values by reading each bit and then Or and bit shift the results to get the colour. The problem is that we are getting bit values, zero or one and after the bit shift we end up with the wrong value. Each bit represent either 0 or 255 and thus the problem. Updated the code with some multiplication and all is good.
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              Patrick Corless added a comment -

              Marking as fixed.

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              Patrick Corless added a comment - Marking as fixed.

                People

                • Assignee:
                  Patrick Corless
                  Reporter:
                  Patrick Corless
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                  Dates

                  • Created:
                    Updated:
                    Resolved: