If you search the ArgyllCMS mailing list archives for threads in which a person named Ben Goren participated, you'll find excellent information on art reproduction.
https://www.freelists.org/archive/argyllcms Rob gave excellent advice to get you started and what he said will benefit all of your image editing. Ben Goren's contributions in the ArgyllCMS archives will fill in a wealth of technical details about art reproduction. On 11/21/2014 04:35 AM, Rob Z. Smith wrote: > Hi Marcial, > > If you don’t have a proper colour managed workflow what you are > attempting is, with dt or any other software, essentially impossible. > Before even thinking about what to do in dt you will need to as a minimum: > > 1)Beg/borrow/steal a monitor calibration device and generate a profile > from this. Then make sure your operating system and/or photo processing > software is using that profile. Note that for your specific requirement > of reproducing the drawings you will want to use specific and controlled > lighting when you do this and use the same lighting when photographing > the drawings. > > 2)Get an accurate printer profile made for the specific > printer/paper/ink combination you are going to use for printing the > drawings. Or send them off to a good printer who supports colour > profiled work. > > 3)Optionally produce an input profile for your camera, and in the > specific lighting conditions you are going to use. This is an added > complexity you might not want though and I recommend not bothering with > this, unless you know enough to know you need it. > > After you have done this you can photograph the drawings and do whatever > you want in dt (or something else) to adjust the image with the > reasonable expectation that what you see on the screen is going to be > as close as possible to what you get on the final print. Unless you are > prepared to set this up properly, which is neither quick, nor easy, nor > cheap, attempting any form of accurate colour work is frankly a waste of > time as your print never looks like what is on the screen so you have no > way of deciding what adjustments you actually need. > > There is a reason why reproducing drawings accurately is a specialist > service – it takes time, money and commitment to learn the techniques > and set up things up. Which isn’t to say that it can’t be done if you > want it enough. > > Rgds, > > Rob. > > *From:*Marcial Gomez Martin [mailto:[email protected]] > *Sent:* 21 November 2014 07:47 > *To:* [email protected] > *Subject:* [Darktable-users] art reproduction, right colors? > > Helo everyone. > > I need some help! > > I'm trying to reproduce a set of drawins to make copies as faithfully as > possible. I have used a grey card in order to fix colors (wb) and > exposition. I figured I could do that by measuring 127, 127,127 in the > card, but the result has been absolutely unsatisfactory. > > I know I can't control the printer output as I don't have any specific > icc profile, but even the jpg images are very redish/yellowish, and very > clear compared to the originals. The printed copies were even worse > (clearer more saturated and redish/yellowish). > > I've been looking into the messages and I'm overwhelmed by all the > concepts involved. To begin with, I don't know if I should disable the > base curve, as it tends to add saturation. I don't know if the input > color profie should be linear or not. Then comes the output color > profile "to the rescue": > > output, perceptual?; > > screen output, ¿?; > > output profile: AdobeRGB?; > > printer profile, a CMYK icc that I dont have? > > screen profile, OS. > > Then, in lightroom mode, export, I have another intent (I asume image > config will take into account the adjustments I've already done) and > another profile... > > My simple question is: Which would be the best workflow to produce a > faithful copy of a picture/drawing? > > I hope someone can help me if I have made myself clear enough (which I'm > not sure of) > > Thanks in advance. > > > This email is confidential and is intended for the addressee only. If > you are not the addressee, please delete the email and do not use it in > any way. Please note that any views or opinions presented in this email > are solely those of the author and do not necessarily represent those of > the company. NHBC reserves the right to monitor all email > communications. 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