Re: uncurve/curve comparison on Loris' website
Charles, If I'm understanding your problem correctly, your curves are correct as shown by a printed tonal palette but your prints are too dark? If this is the case, it sounds like your monitor may have its brightness setting up too high. I would try lowering the brightness and then adjusting the tonality of the image from there. If your display is too bright chances are you'll have a hard time getting a match between what's on screen and the print. Camden Hardy camden[at]hardyphotography[dot]net http://www.hardyphotography.net On 9/28/07 6:30 AM, "Loris Medici" <mail@loris.medici.name> wrote: > Don, > > (1) I agree. My suggestion was assuming Chales doesn't want to go back > to recalibrate each primary color individually but solve the problem > pragmatically -> still using those curves. He says that his calibrations > for each primary color is good -> if he does something wrong, that > should be the pigment concentration... I don't know if it's enough to > simply re-establish a new standart printing time when cutting back the > pigment amount, but I feel like that won't be enough (= probably curves > also will have to change). And if it's that way, then he'll need to go > back to the long / laborious process of recalibrate... I would > definitely try what I suggested and see if that gives satisfactory-to-me > results. If yes, I would never go back to recalibrate since I'm more > interested in making images instead of making images *in the absolutely > correct way*. (Don't take it like I'm not interested in the latter at > all, I just give more importance to be able to put my vision on > paper...) > > (2) Yes indeed. But since Charles said that the only way of getting > paper white with his printer (R1800) was using all inks grayscale > negatives, I simply trust him. AFAIK, R1800 are not the best in the > domain of UV blocking... That leaves him the only option of reducing the > ES of his coating solutions (where available), which translates to "use > less dichromate" and/or "use more pigment" in gum printing. Since we > already suspect that his pigment concentrations are higher than what is > needed, then using less dichromate looks like a sound advice to me. > > Regards, > Loris. > > -----Original Message----- > From: Don Bryant [mailto:dsbryant@bellsouth.net] > Sent: Friday, September 28, 2007 3:05 PM > To: alt-photo-process-l@usask.ca > Subject: RE: uncurve/curve comparison on Loris' website > > > Loris, > >> > Charles if that also doesn't work, don't overlook my suggestion of a > levels / gamma adjustment channel before making separations (in > luminosity mode -> thanks Michael)... >> > > (1) I have to say, IMO that I regard this as a poor approach to solving > the problem. Better to get the curves correct (if one is using curves). > >> > BTW, what dichromate concentration are you using? You may try to use > less dichromate if you use saturated solutions. That way, you may > achieve paper white with colorized negatives (despite their DR being > lower compared to grayscale / all-inks negatives). >> > > (2) You can achieve paper white with saturated dichromate using > colorized negatives. > > Don > >
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