https://bugs.documentfoundation.org/show_bug.cgi?id=93462
Bug ID: 93462
Summary: Lossless compression in ‘Export as PDF’ doesn’t
work—PNG images get distorted
Product: LibreOffice
Version: 4.4.4.3 release
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Draw
Assignee: [email protected]
Reporter: [email protected]
Paste a PNG image into drawing via ‘Insert’ → ‘Image’. I’ve used this one:
https://mega.nz/#!4o8mCaAJ!uEioSdvzNAv2cZULRF0IZhnnlRKqQyvVotlB2IzvMkw
Then try to ‘File‘ → ‘Export as PDF…’ and then choose ‘Lossless compression’
under ‘Images’ in the ‘General’ tab. Uncheck ‘Reduce image resolution’ if it’s
set. Open the resulting PDF in the viewer of your choice. Then save the image
to a file. Open the file in GIMP. Go to ‘Image’ → ‘Image properties’, the file
type should be detected as PNG. Check the file size and notice how it changed.
Use a colour picker tool to compare backgrounds—in the image I’ve used the
background colour was #CCDED8 and after export to PDF it became #CFE0DA. This
isn’t what ‘lossless compression’ should do.
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