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

        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
        Hide
        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
          • Votes:
            0 Vote for this issue
            Watchers:
            0 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved: