BPC clarifications
BPC clarifications
Hi Rich,
"I don't understand, Tom. If "it would not give a good representation of the image" how can it work? Are you describing viewing situations that are not linked to any kind of output? Where the monitor is the final output device - more "pleasing color" situations?"
If the contrast range of the original far exceeds the contrast range of the output,there will never be a good representation of the original image. If you have BPC turned on, you get a low contrast representation of the original, if you turn it off, you clip the shadows. Either way, you don't get a good representation of the original image. It's not a matter of what works, it is a matter the reality of the mismatch between original and the reproduction.
If you consider the wide range of potential ICC workflows there are a number of issues that become apparent. In the context that I am talking, I am going to use the word "bind", which means by my definition, taking a color out of the PCS into a color or device space. In professional graphic arts workflows, there is tendency to bind early. This means the conversion to CMYK is made early on in the process. In Japan there is a great deal of work being done to build new mapping profiles from an sRGB to CMYK output with well defined print perfomance objectives. This is equivalent to a device link profile that links sRGB or Adobe RGB to one of the ISO standard printing conditions. The good news with early binding is that there are no great suprises at the end of the process. The bad news, it is difficult to bring the image to multiple media after binding and the color gamut compression can lead to artifacts due to tying to map one gamut onto another.
In consumer workflows, the binding is late. This is typical of the Windows Color System (WCS). In this sort of system, the color decisions are made the moment you hit the print button and the color you see is the color the printer gives you. There can be some very great surprises in this workflow. Perceptual rendering on output is another late binding mechanism. Within photoshop you can do a reasonable simulation of the print process given a properly formed display profile, a properly adjusted display (display contrast ratio slightly geater or equal to the PCS CR, and well inverted perceptual table (which is not trivial and normally just plain incorrect).
My blanket comment about leaving BPC turned on had to do with consumer workflows. I should have been very specific about this.
Regards,
Tom
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