Hello,

I apologize in advance if this is the wrong list for this question—please let 
me know.

I am trying to understand why CSS colors appear to render in a different color 
space when the HTML document is loaded in Safari versus loaded in a WebView (in 
the Obj-C WebKit.framework).

Specifically, this document (http://ethreesoftware.com/misc/colortest.html) has 
a background-color of rgb(70, 130, 180). When Safari renders the document and a 
screenshot is taken (PNG tagged with the current display profile), sampling the 
background pixels in Photoshop yields the correct rgb(70, 130, 180) values. If 
I render the _same_ document inside of a WebView, take a screenshot, and sample 
the background pixels, the colors are instead rgb(58, 128, 182). Example: 
http://ethreesoftware.com/misc/webview-left-safari-right.png

I'm just not sure what I'm missing here. Is the WebView not using 
NSDeviceRGBColorSpace but Safari is? Is there some kind of OpenGL surface 
interaction that's going on? The above results seem consistent no matter what 
application I test with (i.e. WebViews in Apple Mail, third-party apps like 
Coda, and reduced test-case apps consisting of just a window containing a 
WebView all render the "wrong" color). 

My searches through WebKit and WebCore are ongoing, but I thought I'd reach out 
to the community for a clue, if possible. Thanks for any guidance you can give!

OS X 10.8.3 (12D78), Safari 6.0.3 (8536.28.10)

Thanks!
Jonathan Hammer
e3 Software
http://e3software.com


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