Digital BW, The Print

Hi,
The differences 168 vs 172 are due to gamma differences.  Pro Photo is 1.8 and Adobe 
RGB is 2.2.
Paul

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "bvalente" <bvalente@...> wrote:
>
> 
> > different color space. Then do your photoshop stuff on both of them. 
> > Print with preview using a color profile for your output device, and
> see 
> > what, if any, differences there are.
> >
> 
> here's an interesting test I just conducted:
> 
> created two identical 16-bit gray scale ramps, one in adobeRGB and the
> other in proPhotoRGB colorspace. histogram and numerical details look
> identical.
> 
> applied an identical 's' type curve to both images, bumping the
> highlights a bit and darkening the shadows. just to create some
> representative processing.
> 
> converted both profiles to Epson 2400 museo sr color profile (I think
> this was supplied by crane and downloaded from their website).
> 
> The prophotoRGB registered the mean color as 154.11 with Median 168
> 
> the adobeRGB registered the mean color as 143.23 with median 172
> 
> Don't know what this means other than in this simple experiment they
> don't translate the same, even when the resulting color profile is
> identical. the prophoto histogram appears to have more luminance. 
> 
> interpretations welcome :)
>