ICEpdf
  1. ICEpdf
  2. PDF-246

CMYK to RGB colours conversions are too dark

          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:
            ICEpdf 4.1.2 and higher

            Description

            In version 4.1.2 we introduced an new algorithm to convert CMYK to RGB for various image types. In general the algorithm did a better job then the previous version but as a customer has pointed out that most converted images render a darker then the baseline.

              Activity

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              Patrick Corless created issue -
              Patrick Corless made changes -
              Field Original Value New Value
              Salesforce Case []
              Fix Version/s 4.1.3 [ 10257 ]
              Repository Revision Date User Message
              ICEsoft Public SVN Repository #23757 Mon Jan 10 09:07:11 MST 2011 patrick.corless PDF-246 tweaked the black channel in the cmyk to rgb colour conversion algorithm. The new smaller fraction value of black lights up most images to be much closer to the baseline. The logic is a little fuzzy and subjective but offers an improvement over the original algorithm.
              Files Changed
              Commit graph MODIFY /icepdf/trunk/icepdf/core/src/org/icepdf/core/pobjects/Stream.java
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              Patrick Corless added a comment -

              Tweaked the black channel in the cmyk to rgb colour conversion algorithm. The new smaller fraction value of black lightens up most images and the makes the image much closer representation of the baseline image. The logic is a little fuzzy and subjective but offers an improvement over the original algorithm.

              Show
              Patrick Corless added a comment - Tweaked the black channel in the cmyk to rgb colour conversion algorithm. The new smaller fraction value of black lightens up most images and the makes the image much closer representation of the baseline image. The logic is a little fuzzy and subjective but offers an improvement over the original algorithm.
              Patrick Corless made changes -
              Status Open [ 1 ] Resolved [ 5 ]
              Resolution Fixed [ 1 ]
              Arran Mccullough made changes -
              Salesforce Case [5007000000E6WBN]
              Ken Fyten made changes -
              Status Resolved [ 5 ] Closed [ 6 ]

                People

                • Assignee:
                  Patrick Corless
                  Reporter:
                  Patrick Corless
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                  Dates

                  • Created:
                    Updated:
                    Resolved: