On Apr 26, 2012, at 9:12 AM, Markus Spoettl wrote: > I'm posting this here because quartz-dev seems dead.
Quartz-Dev may be quiet, but it doesn't seem dead to me :). > It shows both the colors used (upper rect) and blended result (lower rect). > The upper screen shot is for two colors that "work". The lower is for a color > that doesn't (color C). The difference between the two is saturation, 0.1 > works, 0.003 doesn't (in case you wonder, 0.004 works). > > So, these work: > [NSColor colorWithCalibratedHue:0.55 saturation:0.1 brightness:1.0 alpha:1.0] > [NSColor colorWithCalibratedHue:1.0 saturation:0.8 brightness:0.8 alpha:1.0] > > This one doesn't: > [NSColor colorWithCalibratedHue:0.55 saturation:0.003 brightness:1.0 > alpha:1.0] > > I don't have the slightest idea why the hue changes so dramatically. Maybe > this is to be expected? Why? Can I avoid that? How? My best guess would be you are underflowing. 1/255 = ~0.0039. 0.004 * 255 = 1, 0.003 * 255 = 0. Since the saturation determines how much of the hue contributes to the final color, if it is 0 you end up with a grayscale color based on brightness. -- David Duncan _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
