Re: [Gimp-user] What is wrong with this picture?
On Thu, 2013-02-21 at 14:03 -0800, Richard Gitschlag wrote: > You missed only one (very important) detail: The tool's Overlap setting. No, I did it at 50% and mentioned that. > All pixels with hues falling between a 15° ~ 45° deviation from > Magenta (a 30° range, or 50% of the 60° between Magenta and its > neighbors) will receive a variable percentage (100% ~ 0%, > respectively) of the Magenta channel's adjustment. Right - but only those pixels - and no, no magenta channel, they get their hue remapped. You could think of I use the tool a lot. Try it with the "master" colour selected and as you move the Hue slider you'll see it works just like Colours->Colourise, colouring the entire image to the hue you select. With just Magenta and and overlap, it's like doing select by colour in Hue mode with a broad range, without feathering the selectoin, and then running colours->colorise on that selection. Whether it's working as intended is another question, but I get the same sort of results regardless of which colour range I choose to remap. Best, Liam -- Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/ Pictures from old books: http://fromoldbooks.org/ Ankh: irc.sorcery.net irc.gnome.org freenode/#xml ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] What is wrong with this picture?
Sorry. I keep forgetting the bugtracker isn't GIMP specific (not that it affects the bug number much) -- Stratadrake strata_ran...@hotmail.com Numbers may not lie, but neither do they tell the whole truth. > Date: Thu, 21 Feb 2013 23:22:45 +0100 > From: schum...@gmx.de > To: gimp-user-list@gnome.org > Subject: Re: [Gimp-user] What is wrong with this picture? > > On 21.02.2013 19:13, Richard Gitschlag wrote: > > ...or what is wrong with my GIMP? This behavior persists in every 2.6 > > and 2.8 build I've tried, in fact I'm pretty sure I first discovered it > > somewhere in 2.4 . > > > > It's GTK bug #644032 > > Why do you label this as a GTK bug? You've reported it against the GIMP > product in GNOME Bugzilla: > > https://bugzilla.gnome.org/show_bug.cgi?id=644032 > > > -- > Regards, > Michael > ___ > gimp-user-list mailing list > gimp-user-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gimp-user-list ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] What is wrong with this picture?
On 21.02.2013 19:13, Richard Gitschlag wrote: ...or what is wrong with my GIMP? This behavior persists in every 2.6 and 2.8 build I've tried, in fact I'm pretty sure I first discovered it somewhere in 2.4 . It's GTK bug #644032 Why do you label this as a GTK bug? You've reported it against the GIMP product in GNOME Bugzilla: https://bugzilla.gnome.org/show_bug.cgi?id=644032 -- Regards, Michael ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] What is wrong with this picture?
> Subject: Re: [Gimp-user] What is wrong with this picture? > From: l...@holoweb.net > To: strata_ran...@hotmail.com > CC: gimp-user-list@gnome.org > Date: Thu, 21 Feb 2013 14:35:07 -0500 > > I don't know where you get your "results should be like this"... you are > not "increasing the magenta channel by 30%", you are mapping all pixels > whose colour value in RGB space is within 30 degrees of magenta to a > completely different hue, to a different location in HSV space > > The effect you show happens with all the colour "channels". > > I think you are wanting to increase saturation. > > Or am I missing something? > > Liam > You missed only one (very important) detail: The tool's Overlap setting. IF we left the overlap setting at zero, then we would get exactly what you described -- only those pixels within absolutely 30 degrees of Magenta would be affected, everything else remains the same. BUT with an Overlap setting of 50%, this "blurs" the threshold between Magenta and Red (and likewise between Magenta and Blue). All pixels with hues falling between a 15° ~ 45° deviation from Magenta (a 30° range, or 50% of the 60° between Magenta and its neighbors) will receive a variable percentage (100% ~ 0%, respectively) of the Magenta channel's adjustment. Test it yourself: Paint a simple red-to-yellow gradient, then go to the Hue-Saturation tool and (with overlap = 0) drain all saturation out of Red. Next, slowly increase the Overlap slider and watch how the pixel-sharp threshold between the two channels becomes a smooth fade. It's very useful behavior when you're using this tool on photographs or other images with smooth color transitions around the hue thresholds; it just happens to make one epic screwup in this particular usecase. -- Stratadrake strata_ran...@hotmail.com Numbers may not lie, but neither do they tell the whole truth. ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
Re: [Gimp-user] What is wrong with this picture?
On Thu, 2013-02-21 at 10:13 -0800, Richard Gitschlag wrote: > ...or what is wrong with my GIMP? This behavior persists in every 2.6 > and 2.8 build I've tried, in fact I'm pretty sure I first discovered > it somewhere in 2.4 . I don't know where you get your "results should be like this"... you are not "increasing the magenta channel by 30%", you are mapping all pixels whose colour value in RGB space is within 30 degrees of magenta to a completely different hue, to a different location in HSV space, so it's no wonder you get weird results. The effect you show happens with all the colour "channels". I think you are wanting to increase saturation. Or am I missing something? Liam -- Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/ Pictures from old books: http://fromoldbooks.org/ Ankh: irc.sorcery.net irc.gnome.org freenode/#xml ___ gimp-user-list mailing list gimp-user-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-user-list
