On 1/12/2014, at 11:17 AM, Martin Orpen wrote:
On 30 Nov 2014, at 21:58, Peter Miles <P.Miles@massey.ac.nz> wrote:
When printing on hahnemuhle PhotoRag 308 paper on our Epson9900 printer I use a custom profile to soft-proof the image before printing. The PhotoRag 308 paper profile is a CMYK profile and built in i1Profiler. I use a colorburst RIP.
Why make life that complicated?
Make an RGB profile for the Hahnemühle paper and print directly to the 9900 via Photoshop and the Epson driver ColorBurst was using the Epson driver on the 9900 last time I looked at it...
Thanks Martin Profiling as RGB would probably get around the soft-proofing discrepancy I'm experiencing. But I have my reasons to profile the Epson as a CMYK printer. But I don't want to divert this thread just yet, in discussing why. I'll be happy to do that a little later. But If you do have any thoughts/ideas as to why I might be seeing a difference in the soft-proof of a black and white image as an AdobeRGB1998 vs a GrayGamma 2.2 file, I'd be very interested to know. Especially given that the gray-axis in both spaces are gray gamma 2.2. Best regards Peter Miles
Hi List members I don't understand something I have been seeing when soft proofing our staffs black and white images.
When printing on hahnemuhle PhotoRag 308 paper on our Epson9900 printer I use a custom profile to soft-proof the image before printing. The PhotoRag 308 paper profile is a CMYK profile and built in i1Profiler. I use a colorburst RIP.
I have noticed that the soft-proof of our staffs B&W images show posterizing in the deep shadows, when the images they supply are in the Adobe RGB1998 colorspace. But the same image, in Gray Gamma 2.2 space does not soft-proof with the posterizing in the shadows. My understanding is that the gray axis of Adobe RGB1998 IS gray gamma 2.2. So why the difference in the soft proof when the a source file is Adobe RGB1998 vs Gray Gamma 2.2?
NOTE: When I use Photoshop to actually convert the RGB versions of the image to "hahnemuhle PhotoRag 308" CMYK color space, there is no posterizing visible in the shadows of the converted file. So it just appears to be a soft proofing thing, but only with 'RGB' colorspace versions of the B&W images.
Your help with clarifying why this happens would be appreciated. Thanks Peter Miles