Digital BW, The Print

Adobe RGB is a gamma 2.2 colorspace.  I don't know what the gamma is  
for proPhoto RGB, but it is probably not 2.2 and that may be why you  
are seeing this difference.

On Mar 20, 2007, at 4:12 PM, 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 :)
>