Stephen, I'm using Photoshop CS. The black (background) in the headshots is mostly 100% black and then I just Image -> Mode -> CMYK with our own Standard EURO profile that we got from the guy that installed our scanner (colour management isn't what it should be)
What exactly do you mean by saying "you need to know the grey balance"? The Cyan is indeed higher when converted, mainly visible in the lighter areas. The values for a 99% black background convert to C=61M=47Y45K=99, I've tried the GCR, and it worked, I held everything over 300% but can I be sure that this will print correct? Wan't there be some sort of "artifacts" starting to appear, spots?... I dunno though,.. Thanks again, Mattas. On 25-10-2004 14:16, "Stephen Marsh"> wrote: >>> Hi all, > > Could anyone please advice me on what is the best way (or values) for > converting a grayscale image to cmyk? > The black in the grasycale image turns into too high values in the cmyk > (C=91M=91Y=83K=99)...<< > > Mattias, can you list the steps that you are taking, including the original > GS value (100%K ??) and how/what you are converting into CMYK (the profile, > rendering intent, BPC etc). What version of Photoshop??? NOT v5.x using > RelCol I hope... > > Two things here... > > i) If you are going to run a four colour greyscale - then you need to know > the grey balance so that you convert to the correct destination profile. > > ii) Using a much heavier GCR ratio than a normal profile such as the SWOP v2 > from Adobe provides is MUCH better, as more black and less CMY makes the > neutral easier to print. > > So, before going into all this in more detail it would be good to know what > version you are using and how you are getting such high values for solid > blacks...also cyan should be higher than the MY for a SWOP type grey > balance, although in the solid deep shadows this is harder to notice than in > lighter tones. > > Something does not sound correct. > > Then we can discuss your separation target and how to get a higher GCR ratio > than what may be on offer in the prebuilt profile. > > Stephen Marsh. > > =============================================================== > GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE > -- .tias. =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
