[Libreoffice-bugs] [Bug 134213] Changed transparency handling in Draw breaks export to PNG of transparent objects over pictures with just default Layout layer, forces use of additional layer(s) for transparent shape(s)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=134213

--- Comment #16 from V Stuart Foote <vstuart.foote at utsa.edu> ---
(In reply to mwtjunkmail from comment #15)
> https://i.imgur.com/JpyvCYG.png is a side-by-side comparison of the original
> non-transparent image next to me cutting up the image (on a new slide
> because I had no idea how to move layers above and below each other).
> 
> I don't know if you can tell, but the image on the right has lost detail.
> The overall image is dimmer, the highlights in the hat are far fainter, and
> her face has lost detail. I hope that's not the permanent end result of
> these changes, because I've no way to compensate for that.
> 

Careful, the source PNG embedded in the ODF archive is sized 473 x600 x 24 BPP.
It will be scaled to place on a canvas you've defined (here 8.5 x 11 inches of
the cover). So the loss of detail is the resampling that has to occur to expand
the pixel count--nearest neighbor, bilinear, bicubic--I don't know which gets
used, just that a resampling occurs, and can appear fuzzy. Very noticeable on
the pillow tassel.

To compare "apples to apples" for image quality on export the Draw page/canvas
size would have to be set to the size of the image.

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