Re: Three tricolor prints
Hi Katharine, Just an idea and not so sure if its worth even trying out? If you were to take 3 of the seperation negatives and Gum print them individually on 3 different sets of your favourite paper. Then scan each gum print, you'd have to grey scale each one and then add each channel to a new photoshop RGB file. So what would turn out? A full colour image...though would it be anything like the original digital image from where it came, in regards with hue, saturation, colour, brightness, contrast? Would this be a tool in troubleshooting? I know there is another mode in Photoshop, CMYK selective colour or MultiChannel, where you can set the colour channel to what you want, don't know if that helps? Can I ask what your printing on (Transparency+Printer)? Also if you do muliple coats for each colour to build them up? Cheers Jacek On Wed Oct 17 1:44 , Katharine Thayer <kthayer@pacifier.com> sent: >Hi Friends, >A while back, I posted, just for fun, two tricolor prints as part of >my ongoing investigation of curves for gum; one of them didn't come >out well because as it turned out, the print settings were wrong and >the color applied to the negative was off. I reprinted the >separations using the right print settings, but haven't got around >to printing them on gum yet, although I'm looking forward to seeing >the corrected print. > >Instead of printing those separations, I printed separations from a >known image, the famous Adobe calibration image with Carmen Miranda >and fruit basket hat, to more clearly make my earlier point (quoted >at the bottom below) that curves and calibrations should change only >the tonality of an image, not the hue ranges of the colors. (And >perhaps also to make the point that there wasn't anything wrong in >general with my curves or with the method I use for generating >curves, as was suggested in that earlier discussion.) > >Just to make sure everyone understands, I'm just sharing work in >progress here; I'm making no claims that these images are perfect; >either that the color balance is perfect or that the curves are >perfect, nor am I drawing any conclusions or asking anyone to draw >conclusions from them; they are just rough prints made very quickly >and not very carefully, to get a general idea of how these curves >"feel" to me. > > In running test prints, I discovered that the pigment mixes that >had given me good tricolor prints with greyscale separations were too >concentrated for the colored and curved negatives, so I lightened the >mixes somewhat; lightening them on the fly I didn't balance them >perfectly and will fix that before I print this pigment combination >again. I'm finding that I don't like the PY97, ; I want a more >transparent yellow since my current practice involves printing yellow >last, and the PY97 leaves a film of opacity over the darker colors, >even though it's not a particularly opaque pigment as yellows go. So >I'll probably go back to PY110. > >I wouldn't make too much of small differences in colors that appear >in the different prints; this could be a result of inattention to >development times or to scanning inconsistencies, at any rate >shouldn't be taken as being an inherent characteristics of the >different types of curves. And the curves are just as they came out >from ChartThrob, with minimal smoothing; I've done nothing yet toward >honing the curves to perfection. > >http://www.pacifier.com/~kthayer/html/Tricolor_ole_comp.html > >Katharine > > > > > > > >On Oct 5, 2007, at 9:10 AM, Katharine Thayer wrote: > >> A note re color balance: >> >> Note that in these two prints, though the incorrect printer >> settings resulted in a print that seems to have a film over it, the >> actual colors are the same as in the print printed by the greyscale >> separations, simply muted because of the incorrect separations. >> The hues should not change; if the pigments are correctly balanced >> in the first place, calibrations such as introducing a colorized >> negative, introducting correct curves, and so forth should change >> only the tonal relationships, not the color balance. If the color >> balance is off in the first place, it should be corrected by >> balancing the pigments, not by trying to correct the imbalance >> using curves. >> >> kt >> >> >> >>> >>> On Sep 25, 2007, at 4:54 PM, Katharine Thayer wrote: >>> >>> http://www.pacifier.com/~kthayer/html/tricolorcomp.html >>> >>> >>> >> >> >)
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