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Re: QCDN for non Ilford paper?
开云体育Peter, You do not need the Pro version to make curves. QCDN works fine for BW. Here are some steps that will help, below, but generally the reason why I engage the filter in the enlarger is that it gives me the choice to lower or raise contrast if I want to on a particular image. I have one profile I have calibrated for each paper (Ilford WM, Reg, Foma, etc.) and any fine tuning is done at the enlarger if I want, but usually not needed since my initial profile was calibrated with the 2 filter in place. I hope that makes sense. Chris When ready to print the negative in the darkroom, always set up the enlarger the same way to achieve consistent results. ? The bottom of the enlarger head rests at the same height (about 25? from lens to contact frame) ? The lens is set to the same f-stop each time, e.g. wide open or a stop or two down ? The light path is focused to cover the entire contact printing frame ? The filter pack is set at a 2 filter and the filter pack is engaged. Example: with an enlarger raised to 25? from lens to contact frame, a 50 mm lens wide open to f2.8, a 35 mm carrier in the enlarger head, Ilford MGIV will expose in 20–25 seconds and Ilford Warmtone in 32–40 seconds. With the same setup, but a 150 mm lens set to f5.6, and a 4??~ 5? negative carrier in the enlarger head, Ilford MGIV will expose in 8–11 seconds and Ilford Warmtone in 12–16 seconds. ? ? ? From:
[email protected] <[email protected]> on behalf of petr.slunecko via groups.io <petr.slunecko@...> Hello, ? I would like to start using digital negative for silver gelatin prints, printing on Fomatone Multi-Grade papers which I use for my work. I have no experience with DN and would appreciate if anybody can help me with answering following questions... ? 1) I wonder if QCDN could be used to adapt its Ilford starter curve to this, or any other MG paper. Or do I need to consider the Pro version to built curve from scratch since my paper can behave totally different? ? 2) I try to read up on the whole process of creating DN but I got confused by QCDN documentation on Establishing Your Base Exposure page with following text: ? ... Start with a grade 0 or even 00 filter to activate the low contrast emulsion and then use the magenta inks along with the gray and black inks to activate the high contrast emullsion to reach a full range of tones. Link: ? I think I understand the logic behind determining base exposure, blocking density, starter curve and and its subsequent linearisation however I am not clear on - ? 2a) whether I set my enlarger to grade 2 during the whole QCDN calibration process and then just use enlarger gradation to control the print contrast.? ? 2b) or whether there is actually no need to play with gradation since any contrast is set in photoshop when making DN and using correct curve it nicely translates to the print and no further contrast adjustments are needed (but still G2 is used for calibration).? ? 2c) or if I perform calibration using low-contrast grade (as suggested above, 0 or 00) and then somehow combine it with adding magenta into the mix to achieve different contrast? ? I am sorry if these questions are out of place or just plain stupid. I feel I need to understand how playing with magenta inks relates to DN curve I assume gets primarily created with K, LK, LLK inks and how it all relates to gradation of MG papers. ? Regards, Petr ? PS: I use Epson P600 and plan to use Pictorico OHP media. ? |