On Sat, Nov 9, 2013 at 12:50 PM, Olivier Goffart <[email protected]> wrote: > Allow me to disagree :-) > How usefull are 1-4 without 99? What exactly can you do with that > information.
I think that in the meantime this has been well reasoned by Kai-Uwe and John: It could be a sane starting point and be needed API for later steps -also from your suggested list-, anyways. Also, I was indeed just thinking about color correcting opaque images and colors. Less about blending, anti-aliasing or gradients. But let's combine our fields, then. > 1) QImage[Reader] converts automatically to linear color space, so that all > QImage's are in the linear color space A few cents regarding ICC profile usage: How would we do the linearization; by using the image profile to transform the image data (what about alpha channel)? And with which output profile (i.e. to which color space)? Note that there really is no meaningful "RGB" without Profile/Colorspace, unless we define a linear qtRgb space for that and ship a profile for that with Qt. I believe that Lab would actually be the right intermediate space for what you suggest. <blah> It is afaik really linear to our eyes, can contain all RGB/CMYK gamuts, and is in the first place a natural intermediate format when transforming from one device space to the other (e.g. from digital camera A to computer screen B). It would therefore make late and early color binding (Kai-Uwe's mail) workflows co-exist peacefully. We would have to consider white point handling, but that's a minor detail. </blah> However, all our RGB-based algorithms would have to be re-implemented in Lab, of course minimum 16 bits per channel, which basically already kills my suggetion :p > 2) A conversion to the screen's colorspace is done "at the end" (by the > platform plugin? by the compositor?) Definitely a workflow which app developers will want. Especially when using QtWebkit, since now most web browsers can do that. But good question... by whom, on which platform. That's what made push my mile stone to 99. Good discussion, let's keep the ball rolling! _______________________________________________ Development mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/development
