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Premultiplied alpha and integration with cairo ? #2

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stuaxo opened this issue May 13, 2016 · 1 comment
Closed

Premultiplied alpha and integration with cairo ? #2

stuaxo opened this issue May 13, 2016 · 1 comment

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@stuaxo
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stuaxo commented May 13, 2016

Does this use premultiplied alpha ?

I assume it might do, as this would make things efficient for SIMD.

I ask, as it is the native pixel format (BaGaRaA) for cairo, so it could make integration with that library efficient + straightforward.
@homm
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homm commented May 13, 2016 •
edited

Originally Pillow works with many modes, one of them is RGBa (true color with premultiplied alpha). Internally, Pillow converts RGBA images to RGBa before resizing and convert back after.

Pillow-SIMD doesn't change any behavior of original Pillow.

@homm homm closed this as completed May 13, 2016
homm pushed a commit that referenced this issue Jun 29, 2019
Merge pull request #2 from radarhere/mime-types
3dd1436 
Tests
homm pushed a commit that referenced this issue Nov 24, 2019
@radarhere
Windows Screengrab DPI fix improvements (#2)
d46f81a 
* Load User32 after possible return

* Removed unused setting of variable
radarhere pushed a commit that referenced this issue Nov 3, 2020
@Cykooz
Merge pull request #2 from radarhere/fix_jpeg_magic_number
b7b4aac 
Updated _open check to match _accept
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@Piolie
Merge pull request #2 from radarhere/open_formats_case
957cc1b 
Moved case transformation before initialization check
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@macjohnny
Merge pull request #2 from radarhere/alpha
a28bd57 
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homm pushed a commit that referenced this issue May 10, 2021
@elejke
Merge pull request #2 from radarhere/autocontrast_tests
b855d75
homm pushed a commit that referenced this issue May 10, 2021
@cholojuanito
Merge pull request #2 from radarhere/docs-pdf-param-update
a02e700 
Corrected syntax
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@DWesl
Merge pull request uploadcare#2 from radarhere/add-cygwin-to-ci
80b8e12 
Only install NumPy through pip on 64-bit.

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Dawars pushed a commit to Dawars/pillow-simd that referenced this issue Mar 12, 2023
Merge pull request uploadcare#2 from radarhere/improve-changeslog
3afd095 
Updated RST formatting
Dawars pushed a commit to Dawars/pillow-simd that referenced this issue Mar 12, 2023
@raygard
Merge pull request uploadcare#2 from radarhere/comment_correct_placement
4cdbeaf 
Once comment is loaded, keep it for subsequent frames
Dawars pushed a commit to Dawars/pillow-simd that referenced this issue Mar 12, 2023
@btrekkie
Merge pull request uploadcare#2 from radarhere/fix-round-to-palette
f100726 
Removed python-pillow#6377 from release notes
Dawars pushed a commit to Dawars/pillow-simd that referenced this issue Mar 12, 2023
@bigcat88
Merge pull request uploadcare#2 from radarhere/xmp-tags-orientation
5d8dacf 
Check that orientation is still absent after reloading Exif
Dawars pushed a commit to Dawars/pillow-simd that referenced this issue Mar 12, 2023
@jsbueno
Merge pull request uploadcare#2 from radarhere/fix6652/imagepalette_r…
9133f35 
…gba_color

Corrected test
Dawars pushed a commit to Dawars/pillow-simd that referenced this issue Mar 12, 2023
@smason
Merge pull request uploadcare#2 from radarhere/write-jpeg-com
399975f 
Use jpeg_write_marker to write comment
scyclops pushed a commit to scyclops/pillow-simd that referenced this issue May 2, 2024
@nik012003
Merge pull request uploadcare#2 from radarhere/grabclipboard
9392f24 
Simplified code
scyclops pushed a commit to scyclops/pillow-simd that referenced this issue May 2, 2024
@scaramallion
Merge pull request uploadcare#2 from radarhere/dev-j2k-precision
144959b 
Simplified code
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@homm @stuaxo