(Sorry for top-posting, as-well) Great to see Qt soon supporting color profiles! I agree with Johan that color profile handling and conversion should be an opt-in feature.
Just a few questions: 1) Would Qt use (and ship) a color conversion library, or would the system library be used where available (e.g. on OSX and Windows)? 2) Would the screen color profiles that are specified in the system screen settings automatically be used? 3) Sometimes, there are different profiles defined -one per screen (and printer)-. Would we have an additional parameter to specify the screen id? I hope not to complicate things with my questions :) ________________________________________ From: development-bounces+alessandro.portale=nokia....@qt-project.org [development-bounces+alessandro.portale=nokia....@qt-project.org] on behalf of Dermenakis Alexandros (Nokia-MP/Oslo) Subject: [Development] Color Profile support on Qt Hi, I am working on adding support for color profiles on Qt 5. It is under discussion if the default behavior of QImage shall be: 1) converting from an embedded color profile to the screen color profile when loading an image OR 2) keep the loaded image in the source color space, until the programmer explicitly requests color conversion. Solution 1 : QImage(xxxx, QColorProfile = Preserve_Embedded) * Keeps the old Qt behavior (providing backwards compatibility without the need of tweaking the code) Solution 2 : QImage(xxxx, QColorProfile = Convert_To_Screen) * Fixes some "bugs" in applications that use QImage directly for visualizing images (i.e. okular) * Better for newly developed applications since color profile conversion takes place automatically Presently when an image is loaded it always gets interpreted as sRGB and no color conversion takes place. Thanks in advance! ________________________________________ From: development-bounces+alessandro.portale=nokia....@qt-project.org [development-bounces+alessandro.portale=nokia....@qt-project.org] on behalf of ext e8jo...@gmail.com [e8jo...@gmail.com] Sent: Monday, July 16, 2012 17:03 To: development@qt-project.org; Dermenakis Alexandros (Nokia-MP/Oslo) Subject: Re: [Development] Color Profile support on Qt Sorry for top posting. Be aware that all usages of QImage goes not target the local screen. I.e. explicitly requesting a conversion seems to be the best option to me. Regards, Johan On 2012-07-16 16:31 alexandros.dermena...@nokia.com wrote: Hi, I am working on adding support for color profiles on Qt 5. It is under discussion if the default behavior of QImage shall be: 1) converting from an embedded color profile to the screen color profile when loading an image OR 2) keep the loaded image in the source color space, until the programmer explicitly requests color conversion. Solution 1 : QImage(xxxx, QColorProfile = Preserve_Embedded) * Keeps the old Qt behavior (providing backwards compatibility without the need of tweaking the code) Solution 2 : QImage(xxxx, QColorProfile = Convert_To_Screen) * Fixes some "bugs" in applications that use QImage directly for visualizing images (i.e. okular) * Better for newly developed applications since color profile conversion takes place automatically Presently when an image is loaded it always gets interpreted as sRGB and no color conversion takes place. Thanks in advance! _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
