On 21/08/12 02:16, Graeme Gill wrote: >> I've actually got a Spyder2Print calibrator, though as I understand it >> that isn't supported by Argyll :( > > Sorry, it's a lot of work to RE something like that, since it's > quite different to other spectrometers. Yeah - I've been trying to reverse-engineer it off-and-on for a while. I'm not really getting anywhere, unfortunately. >> It's a linearisation LUT. From what I can tell, it's intended to counter >> the effects of the film's characteristic curve (H-D, or >> "Hurter-Driffield" curve). Although as you say, matching to sRGB may be >> easier and more productive. > > printcal wouldn't be too hard to modify to target a particular curve shape. Well based on what I've reverse engineered from the film profiles, I need to set the luminance of the CRT (this is different for each film) then build a LUT to linearise the response. I suspect the luminance is set to allow the film to be exposed in a reasonable time while also providing a usable dynamic range and avoiding issues with reciprocity failure in the film. This project is getting more difficult by the minute :-/ -- Phil. philpem@xxxxxxxxxxxxx http://www.philpem.me.uk/