Hi Chris prodig-at-chris.is (CL)::6/11/04::10:42 am:: GMT-0000
>I have been playing with ColorThink this morning, looking into the >Canon 1Ds input profiles that are installed with C1 Pro. I noticed >that they reach very far into the blue spectrum and overall the camera >is capable to produce colors far more satured than 'usual' working >spaces such as AdobeRGB (if judged from these input profiles at least). it is somewhat irelevant (being quite misleading) to view camera profile gamut volume in CThink. The colour space defined by a camera profile does not necessarily mean that the perimeter is full of colour from the camera. (as it would with a printer, where the colours of the chart as scanned do actually define the gamut boundary). > >So I did tests using C1 Pro and mapped the same file into a) AdobeRGB >b) ECI-RGB and c) BestRGB. Looking at the files and seperate channels >in Photoshop I find that the BestRGB version is giving the best >histogram when both AdobeRGB and ECI-RGB show some clipping at the >dark end. Deep shadows render cleaner and richer in subtle colors >using BestRGB. yes Don Hutcheson's Best RGB (no connection with best RIP) was intended to contain scans as well as he thought practical. This means it's quite a bit bigger that ARGB. But nowhere near the size of those C1 profiles you mentioned. > >Here in Iceland ECI-RGB has been adviced (by printers mainly) as the >standard of choice over AdobeRGB you should look at Lstar RGB from karl Koch at color-solutions then (Karl wrote the original eciRGB. >since its D50 rather than D65, thus giving >better results for CMYK conversions. I don't think that's why it gives better results. Although the WP of a profile is relevant, it's the gamut that's the issue here. >I have been using it as my standard working space ever since I got C1 >pro, but before that time I used AdobeRGB (since photoshop RAW doesnt >allow you to choose all working spaces installed). Overall I have been >happy with ECI-RGB and havent had any problems delivering these files. OK as long as a client is respecting the embedded profile you should be fine. > >However based on my test BestRGB looks to be the best choice for my >1Ds files. you may be right >But I am reluctant taking it up as my standard workingspace since its >very 'non standard' and I fear issues when I deliver files. I could remap to >ECI-RGB but I am probably loosing info due rounding errors in the >calculation... you'd lose what you originally gained, just try it, the conversion will clip, just like the original one was doing. > >What are you guys using with C1 and 1Ds? Has anyone looked further into >this? yes, a lot however, although it's immensely important it's little discussed. To me this is an extremely important issue, since, everywhere, every day, digi users are clipping scans and camera files in one fell swoop as they convert images to their chosen workingspace. Best Regards Neil Barstow Consulting in Imaging & Colour Management http://www.colourmanagement.net/ http://www.apple.com/uk/creative/neilbarstow/ =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
