Graeme Graeme-at-touchdigital.co.uk (Graeme Bulcraig)::4/10/04::8:02 pm:: GMT+0100
>From: Neil Barstow >>gmg, eh? >>I got trained on that a few months back by gmg's boffins. >Yes, Should be in next week...Running off Dual Xeon PC (arggh..PC), >anyway. we are really looking forward to seeing this 4-d colour >transformation in action. The non-ICC conversion may be a whole topic >of discussion in itself. yes it is. 4D their special sauce, a kind of device link for CMYK to CMYK only. >..but as a quicky.... I was initially very concerned that the >separations made in GMG might prove problematic when opened back up in >Photoshop. gmg colorProof converts the tif image data during proofing, in a conversion from the press CMYK, the 4D conversion result is only of any use for the proofer. If you're using the <<RGB - Seps>> module (which is an addition to Colorproof) then you can drop, say, Adobe RGB and get your press ISO CMYK aswell as a proof. >On opening the file (with no ICC embedded profile), If you're wanting gmg to make CMYK from RGB for you, you'll need the RGB > CMYK workflow app. to do that before the file goes to colorProof. As to the proofer file I don't think you can get at it and it's Epson printer ready anyway, you'd not want to open it. > how does anyone actually VIEW this beautiful seperation? I guess you use a profile and trust that the CMYK which gmg made in the RGB module matches. > Obviously PS needs to assign (USE) a profile (even when >you do not assign) to show the info on screen. yep I'd have thought you should perhaps be making press CMYK from RGB in Photoshop with gamut control etc. etc. You'll have to let me know if the gmg method is superior. >Will this be inaccurate to view? According to (pretty grumpy) staff at >GMG stand last week; If we proof to ISO Coated in GMG and then assign >ISOCoated.icc in PS afterwards all will be fine and well. I'd think so. The gmg 4D transform is a proprietory way of making inkjet (proofer) CMYK from press CMYK without unravelling the K channel via Lab. [this is particularly important for text applications]. > I wonder if you can clarify >this? How does a non-ICC application, link back into an icc app, it doesn't but as long as the ISO conversion was correctly made (as defined by the profile you have available to assign) you should be fine. >or is it that only the CONVERSION is non-icc, meaning that afterwards >we are fine to go back to icc? yes, that's the story remember - the converted [proofed] file made in the 4D transform is only for the inkjet - the ISO or DP10 CMYK made from the RGB original stays that way. Best Regards Neil Barstow Consulting in Imaging & Colour Management http://www.colourmanagement.net/ http://www.apple.com/uk/creative/neilbarstow/ =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
