2010.06.14 05:59 "Re: [Tiff] Class Y images with alpha channels", by

Thomas,

is there a possibility to add an alpha channel to a class Y (YCbCr) tiff image? I don't see this in the rev.6 specs.

Nor does the spec mention 12 bit per channel YCbCr, nor does the spec mention RGB with alpha and two unspecified channels, nor does it mention 20 bit per channel grayscale, etc. We ought to understand the 'class' concept in the spec as a (misleading) enumeration of 'typical usage', whilst the tag system makes perfect sense as to allow just any variation.

Best regards,

Joris