Digital BW, The Print

That's all fine and a move to assuming a gamma of 2.2 versus 1.8 brings them more in line with common sense. An operating system needs to assume a profile when none exists in order to render an image on a display (although I agree one can debate which 2.2 gamma profile is assumed). But what OS-X appears to be doing is converting any greyscale image (I haven't looked at colour) to "Generic Gray Gamma 2.2 Profile" (wherever that came from) even if it has an existing profile embedded. It was Roy who first mentioned this to me. When I print an image tagged (by conversion) gray gamma 1.8, gray gamma 2.2 or QTR-[custom user profile] they all print the same on Epson ABW (and this happens with QTR) because each is converted to Generic Gray Gamma 2.2 by OS-X prior to printing. These are tagged files that are being converted.


On 8 Mar 2012, at 08:24, Ernst Dinkla wrote:

> There is an OS-X v10.6 page related to untagged images but it does not 
> tell you what the default substitution is. Both sRGB and AdobeRGB are 
> mentioned for manual tagging, the last is 2.2 Gamma, the first more or 
> less 2.2 Gamma. For Greyscale no gamma is mentioned.
> 
> http://support.apple.com/kb/ht3712
> 
> 



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