Hi, The convention is probably based on where the graphics comes from.
- Straight alpha: Painted graphics and exporting it with an alpha mask. Colors remain unchanged. - Unpremultiplied color: Images from render and composite, converted to display color. - Premultiplied color: A straight alpha image, converted to to premultiplied colors. Each is actually different :) -Ton- ------------------------------------------------------------------------ Ton Roosendaal Blender Foundation [email protected] www.blender.org Blender Institute Entrepotdok 57A 1018AD Amsterdam The Netherlands On 20 Dec, 2012, at 20:20, Troy Sobotka wrote: > On Thu, Dec 20, 2012 at 10:36 AM, Brecht Van Lommel > <[email protected]> wrote: >> Premul for float and key for byte images could work. > > Just in the interest of consistency, if we are going with > "Premultiplied" naming convention, can we roll with the inverse of > "Unpremultiplied" and apply it consistently? > > I checked in with Mr. Selan and he suggested that "Unpremultiplied" as > consistent. Mr. Gritz uses[1] the TIFF convention of "Associated" and > "Unassociated" convention. > > I'm open to whatever naming convention we rest on, and only hope we > can apply it consistently throughout the interface. In particular, the > sidebar panels should likely list "Premultiplied" and the node > conversion should reference "Premultiplied" and "Unpremultiplied."[2] > > The "Color Unpremultiply" term should probably be re-evaluated to > avoid confusion, as it is an order of operations event, and the > current label is far to close to the other terms which can only amount > to greater confusion. > > Blender needs to take whatever path is most healthy for it, but we can > at least aim to apply the terminology consistently. > > With respect, > TJS > > [1] > http://lists.openimageio.org/pipermail/oiio-dev-openimageio.org/2011-April/004193.html > [2] http://comments.gmane.org/gmane.comp.lib.openimageio.devel/1406 > _______________________________________________ > Bf-committers mailing list > [email protected] > http://lists.blender.org/mailman/listinfo/bf-committers _______________________________________________ Bf-committers mailing list [email protected] http://lists.blender.org/mailman/listinfo/bf-committers
