[Bf-committers] New Year's Alpha

Troy Sobotka troy.sobotka at gmail.com
Tue Jan 3 02:17:04 CET 2012


I thought I'd point out that as of r43004 both associated and
unassociated alpha can now be properly handled for non-linear formats
such as TIFF.

A tremendous thanks to Brecht for the fix.

The TL; DR for Blender artists:

When importing a non-linear associated alpha image, artists should
always check "Color Unpremultiply" from the image properties panel.
This will unassociate the alpha from the RGB values _prior_ to
linearization from the sRGB format.

When exporting to non-linear file formats with associated alpha,
artists should be certain to select "Color Unpremultiply" from the
"Shading" panel. This will unassociate the alpha from the RGB values
_prior_ to exporting from the linear internal format. The result is
then associated to the sRGB transformed pixels.

Don't hesitate with any questions.

With respect,
TJS


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