On oct 23, 2004, at 04:32 AM, Thomas Holm / Pixl wrote:
The ISO profiles are built with print open and for some reason (unknown to
me) the relCol will put down more ink in midtones to shadows making the
image appear dark (too dark imho). Thus ECI (who distribute the profiles)
recommend to use Perceptual because it better matches the original...
Dear Thomas.
Should I expect this behaviour of the Blacks with Perceptual vs RelCol rendering to occur with other output press profiles ( like the SWOPS or Sheetfeds) too?
I have been complaining about a number of my files being sistematically printed too light, ( too much shadow detail you can call it) this is, an apparent lack of black and dark greys which would add more contrast to final printed results, which are acceptable, but no more than that. A little flat for my taste, and something I have always attributed to the extended dynamic range of files from cameras, ( at least this may also be part of it).
I have been adding more contrast to RGB files as to try to recover from this "lightness" in the blacks, but still I miss some contrast "punch" in final results when I try to obtain the contrast as from scanned slides.(please note that I love chiaroscuros and strong contrasts, so many people may LOVE the extra dynamic range from digital files, but is not my case).
I am going to CMYK from Color Match RGB files and the Perceptual rendering leaves almost no out of gamut colors from my files, so conversions are very straightforward and seldom problematic, with the unexpected exception of the blacks, which look OK on screen, but print lighter than expected.
I see almost no major change on screen when I run the conversion under RelCol rendering instead, but so far have not sent any file converted like this to the Press.
Would this change help, or should I look elsewhere? Or should I suspect these guys are actually stripping the profile before processing and this creates the situation?
BTW, having almost no access to the Press guys,( they are located too many hours away from the city),
I have been told by designers that this Press workflow sends the Black ink to the paper first, followed by the other colors. I can't say if this is entirely correct, and don't know if this may also have an impact on contrast.
My very limited knowledge on Press dynamics( and my common sense too) says Black goes last, doesn't it?
THX!
Jorge Parra Photography
APA /EP www.JorgeParra.com www.TheStylePortfolios.com
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