AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2003.02.03 18:11 "Pre-multiplied alpha", by Dante Allegria
2003.02.04 04:04 "Re: Pre-multiplied alpha", by Chris Cox
2003.02.04 16:02 "Re: Pre-multiplied alpha", by Dante Allegria
2003.02.04 17:23 "Re: Pre-multiplied alpha", by Daniel McCoy
2003.02.04 22:37 "Re: Pre-multiplied alpha", by Chris Cox
2003.02.05 00:49 "Re: Pre-multiplied alpha", by Chris Cox
2003.02.05 13:29 "Re: Pre-multiplied alpha", by Jan Edmundson

2003.02.04 04:04 "Re: Pre-multiplied alpha", by Chris Cox

Has anyone noticed that Photoshop 6 has changed its handling of pre-multiplied alpha from tiff images from Photoshop 5? Namely, it seems to no longer recognize pre-multiplied alpha.

Sorry, but nothing changed in that regard.

TIFF specifies that images with transparency (at least one associated alpha channel) must be premultiplied (black for RGB/Grayscale, white for CMYK), and Photoshop has always and will continue to treat it that way until the TIFF specification changes.

Chris