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  1. XWiki Platform
  2. XWIKI-23442

PNG with transparency is black when resized without ratio locking

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    • Unknown
    • N/A
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    Description

      Steps to reproduce:

      include a PNG image with transparent background in a page with the following parameters - unlocked ratio, works also with only height set:

      Image provided for example purpose:

        

       

      Expected result:

      The image is correctly displayed

      Actual result:

      The image is displayed with a black background - in fact the image seems displayed in inverted black and white.

       

      Seems to be a regression of https://jira.xwiki.org/browse/XWIKI-15062

      Attachments

        1. image-2025-08-07-14-46-13-265.png
          35 kB
          LAMBLIN
        2. image-2025-08-07-14-49-07-512.png
          46 kB
          LAMBLIN
        3. ibm-spectrum-scale-1.png
          6 kB
          LAMBLIN
        4. test.png
          2 kB
          Thomas Mortagne

        Issue Links

          is caused by

          Bug - A problem which impairs or prevents the functions of the product. XWIKI-22411 Image inserted with height or width parameter isn't displayed in the orientation provided by EXIF data

          • Major - Major loss of function.
          • Closed
          is related to

          Bug - A problem which impairs or prevents the functions of the product. XWIKI-15062 PNG with transparency is black when resized by xwiki 9.11.1

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Activity

            People

              surli Simon Urli
              clamblin LAMBLIN
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              Dates

                Created:
                Updated:
                Resolved: