Hi Krzysztof, I am indeed doing cmy separations internally. Maybe madness but that's just how it is. Best Regards Stali Subject: [argyllcms] Re: Rendering Intents From: k2mil@xxxxxxxxxxxxxx Date: Mon, 7 Apr 2014 15:50:08 +0200 To: argyllcms@xxxxxxxxxxxxx Hi So this is not the case which I experienced, but what I think is worth to consider is that some printers receive RGB only and internally do cmy(k) separations. I hope this is not yours case. Best regards On 7 kwietnia 2014 08:44:36 CEST, Stalis Man <stalis_man@xxxxxxxxxxx> wrote: Hi Kryzysztof, I am writing a little tool to take CMY encoded Tiff files and convert them to a file that I can send direct to the printer via USB bypassing its usual driver. So I have no RGB in my work flow. Best Regards Stali Subject: [argyllcms] Re: Rendering Intents From: k2mil@xxxxxxxxxxxxxx Date: Fri, 4 Apr 2014 13:11:31 +0200 To: argyllcms@xxxxxxxxxxxxx IMHO you have a RGB printer. I experienced the same symptoms in the past. Best regards Krzysztof On 4 kwietnia 2014 11:47:10 CEST, Stalis Man <stalis_man@xxxxxxxxxxx> wrote: > Date: Fri, 4 Apr 2014 16:28:15 +1100 > From: graeme@xxxxxxxxxxxxx > To: argyllcms@xxxxxxxxxxxxx > Subject: [argyllcms] Re: Rendering Intents > > Stalis Man wrote: > > Hi, > > > collink -v -qh -i s -g srgb.icc cmy190214_SP.icm sRGBcmy190214_s.icm > > for a saturated intent. > > > I am profiling a printer with just C, M and Y hence I > > made the cmy190214_SP.icm profile without any K at all with: > > > colprof -v -qh -kz -l300 -iD50 -nP -nS -S srgb.icc cmy090114. > > So the printer is defined to be CMY space ? If so, the -kz doesn't > apply - there is no K ink. > > Or do you mean that you have profiled it as a CMYK printer ? > If so, -kz is not guaranteed to give you zero K ink, it just gives > you the minimum possible that achieves the ta rget colors. > > > I printed of the standard colour checker card I was > > surprised that the perceptual intent looked rather 'smokey' compared to the > > Saturated intent whilst the Relative looked too brown compared to the > > Absolute. > > It's not possible to comment without knowing the source of the image file, > the workflow used to print it, or be able to see the result. > > > As a result folks seem to prefer the saturated intent whilst > > I had expected the Perceptual to be the one they would want. Their choice > > is > > down to the general darkening of the perceptual. > > Naturally people prefer "pop" if they see it in isolation and want impact. > "pop" is not accuracy though. > > > Is the perceptual being smokey/ darkened to be expected or > > have I dropped an obvious clanger. > > Check what you mean by CMY. To profile in CMY you need to create a CMY > chart and print with just CMY. > > Graeme Gill. > > Thanks for your response Graeme. I'll clarify. I am profiling a CMY > printer and I did create and measure a CMY chart. I used the -kz because I > wasn't sure how things worked internally, I'll retry without it. It's CMY > because I am using dyefilm which doesn't support K. Regarding the 'smokiness' > it is a very subjective term to use. What I was trying to explain was that > having created a device link with a perceptual intent and another with an > absolute intent that the Yellows looked quite different although within > gamut. Absolute was fine whilst Perceptual looked as if I were looking > through a dirty window. Maybe I am expecting too much? I understand that > perceptual is supposed to be more pleasing to photographers but this f rom a large gamut to a smaller gamut is decidedly not. I'll look at the D65 / D50 missmatch. Best Regards Stali -- Wysłane za pomocą K-9 Mail.