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bug#8402: Acknowledgement (24.0.50; Hex colors are not rendered correctl

From: David De La Harpe Golden
Subject: bug#8402: Acknowledgement (24.0.50; Hex colors are not rendered correctly on OS X (Cocoa))
Date: Thu, 05 May 2011 12:13:44 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110402 Icedove/3.1.9

On 05/05/11 10:17, Steve Purcell wrote:

Would there be a problem if X11 was left as-is, and NS started to interpret 
#rrggbb as sRGB?

Shrug. Insofar as with the current situation one can't expect the
colors to match across the platforms anyway, I guess it wouldn't matter
much. And I do suspect (but n.b. haven't yet checked) that on w32, they
already end up sRGB rather than device-specific, just as a result of
most w32 apis being defined to be sRGB IIRC.

** However, another option, likely quite easily implemented, though,
could  be to just offer a customization as to which of the suitable
predefined spaces to interpret values in on ns, e.g.

(defcustom ns-color-space 'srgb
   "Interpret color specifications in the given color space."
   :type '(choice (const :tag "sRGB" srgb)
                  (const :tag "Compatible with Adobe RGB(1998)" adobe)
                  (const :tag "Calibrated/Generic RGB" generic)
                  (const :tag "Device RGB" device)))

and then use the relevant NSColorSpace classmethods [1] and NSColor
colorWithColorSpace. [2] in the relevant spots, instead of just
colorWithCalibratedRed or colorWithDeviceRed.

That seems to me to be a fairly good option for now?

(A decision would also need to be made as to whether the named color
values bundled with non-x11 emacs are interpreted relative to that
configured space or considered to be sRGB (or one of the others))

> using sRGB on NS would keep emacs unsurprising to OS X folk (to
> paraphrase you).

Thing is, the Apple docs do seem to be encouraging use of their
NSCalibratedRGBColorSpace, and not sRGB, so I'm not actually convinced
sRGB would be unsurprising to OS X folk, at least if other OS X apps
are following those guidelines. The people it primarily wouldn't
surprise might be web and windows folk...

Another little issue is that there _is no_ predefined sRGBColorSpace
available until macosx 10.5+ ! [1]. Do we still support < 10.5 ?

[1] http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSColorSpace_Class/Reference/Reference.html#//apple_ref/occ/cl/NSColorSpace

[2] http://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSColor_Class/Reference/Reference.html#//apple_ref/doc/uid/20000353-BBCJCBJA

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