Re: When is (NSColor) black not black?
Re: When is (NSColor) black not black?
- Subject: Re: When is (NSColor) black not black?
- From: Douglas Davidson <email@hidden>
- Date: Mon, 2 May 2005 15:39:15 -0700
On May 2, 2005, at 1:36 PM, glenn andreas wrote: If what you want to do is see if it really is "black", you can do something like:
if ([[[colorWheel color] colorUsingColorSpaceName: NSCalibratedWhiteColorSpace] whiteComponent] == 0.0) // we've got black
If you want to see if the color in the picker is "the same" as any other given color, first try converting to the appropriate color space (and it would be up to you to decide which color space that is, be it RGB, CMYK, white and calibrated or device specific). You may want to also figure out if the alpha component matters (are two colors that have the same color components with different alphas the same color? Depends on your needs...)
When you do something like this, you should be sure to check that the result of colorUsingColorSpaceName: is not nil. Not all conversions are possible.
Douglas Davidson
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