Digital BW, The Print

Thanks Tyler.  Given the step wedge will give the answers I need that's
fine.  I can simply measure where each L step will end up for a "matte
print" and for a "photo print".


> From: Tyler Boley <tyler@...>
 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale
> <stevekale@b...> wrote:
> ...
>> 
>> Of course, perceptual rendering won't necessarily leave image L=50
> luminance
>> at L=50 reflectance but you can print an L step wedge to see where
> each step
>> gets mapped to - I think....someone who understands Perceptual
> rendering a
>> lot better than me can chime in here: is it image dependent or a
> mapping of
>> greyscale that can be measured by printing a Lab step wedge?
> 
> Not image dependent. Perceptual rendering is characterized by the
> nature of the two spaces involved, regardless of image content.
> For example, perceptual conversion from a large color to small color
> space will shrink gamut based on the spaces, even if there are no
> (destination) out of gamut colors in the file.
> Hope that wording makes sense.
> 
>>  BTW is there a
>> way to read the proof image values ie the pro forma image values for
> a given
>> proof?  My understanding is that there is not and that PS will only
> display
>> (Info palette) the image values.
> 
> One hack might be to load your eventual print space as your working
> space but leave your file in it's original space when opening, but it
> must be tagged. Then info palette should show the destination numbers,
> just as CMYK does for rgb files. I'm assuming this will happen, but
> not positive. Obviously rgb to cmyk is a color model difference as
> well, and what you want is between two gray spaces.
> A bit inconvenient, but if you were really curious at some point in
> the workflow, you could check it out.
> 
> Tyler