Well, just like you, sRGB really covers practically all of what I need, but I get a little carried away by all the possibilities in the argyllCMS tools. And to Gerhard: I'll have to look into those options, I missed them. On Mon, Nov 23, 2009 at 7:29 PM, Roger <graxx@xxxxxxxxxxxx> wrote: > Michel, > > Color management in general and monitor calibration in particular is very > frustrating. When you think you have all issues covered, new ones creep in, > invariably. > > In reading your post, I thought your wishes might be better served by using > a true wide gamut monitor, like an HP LP2475w (700$ cdn) or something > similar. That way, you get exactly what you expect, no fuss with perceptual > mapping, the pixel you see is the pixel you expect to see. Not clipped. > > Personally, since I don't have a wide gamut display (what's my excuse?), I > stick to sRGB. When I shoot pictures with my poor Nikon D100 and only want > JPEGs, I chose sRGB in the camera. Otherwise, when I shoot RAW and want to > retain a little more control over the faith of color, I render to sRGB. That > way, I am never disappointed. But I confess my work does not involve > shooting extremely saturated colors. So sRGB is plenty for me. > > Wide gamut LCDs are coming down in prices every day. > > Best / Roger > >> -----Message d'origine----- >> De : argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms- >> bounce@xxxxxxxxxxxxx] De la part de Michel Joly de Lotbinière >> Envoyé : 23 novembre 2009 02:07 >> À : argyllcms@xxxxxxxxxxxxx >> Objet : [argyllcms] Re: Perceptual intent in Display profiles? >> >> Graeme, Roger, >> >> Thanks for the advice and hints. Sorry for the delay in replying, I >> really appreciate the response. >> >> My earlier mistake was to even bother with the smaller targets and >> medium quality option in the various programs. The medium quality >> matrix/shaper profiles were just not very good, so I switched to LUT, >> but with too small a target chart. This wasn't a good basis for >> comparisons. The improved grayscale linearity, absence of >> colour-casts, and separation in shadows/hightlights of these larger >> ArgyllCMS lut profiles is really good now in colour managed >> applications. >> >> Yesterday I went through another calibration/profiling exercise and >> used dispcalGUI (and Argyll 1.0.4 )to calibrate to the sRGB curve and >> profile the LCD panel using the 512 patch "large" chart provided with >> dispcalGUI, and finally specifying a plain LUT profile, another using >> gamut-mapping options, with the sRGB profile included in the Argyll >> 1.1 RC1 archive as the source space (most of the photos I look are >> already in the sRGB space), and finally with AdobeRGB as the gamut >> source space: so colprof -S whatever.icc -cmt -dmt were the options >> used. >> >> My simple idea was that a real perceptual conversion from working >> space to monitor space would be an advantage in editing pictures, >> since distinct colours outside the LCD gamut would be mapped >> perceptually to distinct in-gamut LCD colors as far as possible, >> instead of simply all mapped to the nearest colourimetric in-gamut >> colour, thus losing gradations. >> >> Using these various monitor profiles with a photo that had some pretty >> intense out-of-sRGB-gamut colours, I've realized the whole idea is not >> adapted to editing tasks: in effect, the gamut mapping means a visual >> desaturation of the intense colours to show their gradations in the >> working space data--the dull appearance of the AdobeRGB-->monitor >> gamut mapping is really an artifact of the over-all dynamic range >> compression that Graeme mentioned. The sRGB-->monitor profile had less >> of an effect, but then what's the point? So this perceptual mapping in >> a monitor profile is not very useful for accurate editing of what the >> photos actually contain. >> >> It's probably better to deal with any visible issues of out-of-gamut >> colours in the conventional way, adjusting their luminosity & >> saturation to suit the destination (using proofing, etc.). >> >> Anyway, the upshot of all the weekend pixel-peeping and reading about >> colour management is that is that I understand a little more of what's >> going on, know what to expect--cf. Roger's remarks, and I'm going to >> keep things simple from now on! >> >> Thanks. >> >> 2009/11/19 Roger <graxx@xxxxxxxxxxxx>: >> > Michel, >> > >> > Je pense que tu attends trop du profil, une fois la calibration >> appliquée, >> > dans les ombres. Considères ton choix de gamma et le gamma "natif" de >> > l'écran. Considère aussi que, pour obtenir le noir que tu demandes, >> il est >> > possible que la calibration doive assombrir les ombres au-delà de ce >> que tu >> > crois acceptable. Peut-être qu'en réalité ton écran montre trop de >> > différentiation dans les ombres alors qu'il n'y en a pas vraiment. >> > >> > Bitte excuse my french / Roger >> > >> > >> > > > > >