[EMAIL PROTECTED] schrieb:
I tried both, and both seem to work.Thanks Gerhard for trying it out and explain to me the syntax in color management. Did you try the 1st PDF in gs 8?
Does it look closer to Acrobat display?Phillip,
basically, using gs 8 in conjunction with the specific CSA I sent you, should create a relative colorimetric sRGB preview (proof) on the screen, which is supposed to look like the PDF file, if printed on a SWOP press (-> US Web Coated SWOP color space).
As the CSA I sent you was created from the USWebCoatedSWOP ICC profile, it will create a preview for USWebCoatedSWOP. But alternatively, you could also offer previews for different other CMYK color spaces (E.g. US Web Uncoated, US Sheetfeed Coated/Uncoated, Euroscale Coated Uncoated, ...) or you could even offer your clients to upload the CMYK profile for their printer/press, in order to create a preview for _their_ particular printer.
No, I can't assess stability, I just downloaded it yesterday in order to test with your PDF file - only for you :-)If so, I think I need to upgrade to ghostscript 8. But I heard that gs 8 was not as stable as 7 at this stage.
BTW: gs 8 also does now use sRGB as its default CRD, while earlier gs versions did use a different RGB color space. As you want to create images for the WEB, where sRGB is the default color space, sRGB is likely to be the most appropriate RGB color space for your preview images.
Basically you're letting gs convert from DeviceCMYK to DeviceRGB (using the formula in chapter 7.2.4 in the PLRM), then you interpret these DeviceRGB values as RGB values in PhotoShop's working colorspace, apply USSwopCMYK.icc, first bakwards (PCS -> device), then forward (device -> PCS). I do not understand why the resulting overall transform should give any meaningful, well defined preview for any particular device. Sorry, IMO such a transform is just a strange heuristic and has nothing to do with color management.Another workaround to this problem is to transform the preview to CMYK using USSwopCMYK.icc as output profile and transform the preview back using the same profile as input profile. This seems to do the trick. However, this need some changes in jpegicc.c file. I did some testing and the result seems to be promising.
Regards, Gerhard
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