https://bugs.documentfoundation.org/show_bug.cgi?id=164063

--- Comment #4 from Regina Henschel <[email protected]> ---
I see the problem still in Version: 25.2.0.0.alpha1+ (X86_64) / LibreOffice
Community
Build ID: 7c7e7da1538c1ed0c65821e18233ec9dcdc6cd2b
CPU threads: 32; OS: Windows 11 X86_64 (10.0 build 22631); UI render:
Skia/Vulkan; VCL: win
Locale: de-DE (de_DE); UI: en-US
Calc: threaded

(In reply to Telesto from comment #3)
> @Regina
> I have no idea what's going on here. The images in the example file have a
> delayed execution or painting on screen when rotating. Apparently a thing
> for years (at least also in 7.0.0.3) 
> 
> However there are cases where it simply works, like attachment 184430
> [details]

The difference between the two images in the test file is their color
distribution. The right image has less colors and these colors are small peaks
in the color histogram. The left image has about 1.5 times colors and wider
peaks in the color histogram. When you reduce the colors of the left image to
16 colors (still with 24bit color depth), then the rotation is as immediate as
with the right image.

The conclusion for me is, to not burden images transformations to LibreOffice,
but transform images in a dedicated image editing application and use the final
result in LibreOffice.

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