https://bugs.documentfoundation.org/show_bug.cgi?id=128992

            Bug ID: 128992
           Summary: Compressing PNG files with alpha channel get a black
                    background
           Product: LibreOffice
           Version: 6.3.2.2 release
          Hardware: All
                OS: Mac OS X (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 156072
  --> https://bugs.documentfoundation.org/attachment.cgi?id=156072&action=edit
png file to reproduce

Compressing PNG files with alpha channel get a black background.

Steps to reproduce :
- insert a png file with alpha channel (see example in attachement) into
libreoffice writer (either using the insert menu or drag and drop)
- right-click "compress"
- in the compress dialog box use JPEG compression, then click OK
- image gets compressed with black background

Used to work properly (i.e. get a white background) with previous libreoffice
versions
Same issue with Draw

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