require 3 or 4 B2A output channels
We'd been requiring 1-4 in one place and 0-4 in another,
while asserting it was 3-4 in the CLUT transform code.
This should make everyone agree on 3-4.
Add a profile with 2 output mBA tag,
which we should now fail to parse.
Reviewed-by: Brian Osman <email@example.com>
Commit-Queue: Mike Klein <firstname.lastname@example.org>
4 files changed