El sáb, 02-05-2015 a las 12:40 -0400, Elle Stone escribió: > Well, you might be able to answer that question. I'm not qualified. > Personally I don't use alpha channels except in the extremely rare > instance when I'm exporting a png with a transparent background for use > on a website.
See, this is exactly what I intended to discuss. You know a lot about linear and perceptual gamma, so in your opinion everything has to be tailored to allow you to play as you wish with gamma. For you it is essential. Now, you think you don't use alpha channels, so you don't care much about the options provided. But you actually use alpha channels a lot: every time you create a layer mask you're creating an alpha channel for that layer, and if that alpha is associated or unassociated makes a big difference. AFAIK, most of the time alpha channel is unassociated in GIMP, but when you have to apply any convolution you have to "pre-multiply" it. And what about alpha channels being linear or perceptual? Why don't you care? In that case, developers chose for you, and you don't seem to feel too bad about it. And believe me, when it comes to alpha channel THERE IS right and wrong, no matter what the artist says. Blending modes and other operations have been designed to work in certain way. They have an intended result. Unfortunately limitations in the available technology in the past forced programs to do things as alpha compositing in 8 bit gamma. It looks like shit but users got used to that appearance. That doesn't mean that alpha compositing in gamma space is ok and it is a valid option so programs SHOULD allow it. It's an infortunate legacy that could be corrected by making the tool work as it should work, as it is intended to work. Some people may want having the uglyness back, so a special (optional) tool to override the proper behavior with that crap could be used. Personally, I'd love to see all the operations work on linear data only. If a mechanism for overrides is in place, getting legacy support would be probably just matter of setting a global override making everything work in gamma. In both cases an extra tool could allow flipping stuff to the other "mode" temporarily. In the case of gamma we've been discussing it is something that seems to be just one "gamma node" away. Actually, you don't even need that. with enough bit depth the levels tool alone is good for making gamma stuff more or less linear and linear more or less perceptually uniform, for artistic purposes. And since you don't seem to worry about "right" or "wrong" results, that should suffice. Gez. _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
