Re: RGB printing with GMG
Re: RGB printing with GMG
- Subject: Re: RGB printing with GMG
- From: Thomas Holm/pixl <email@hidden>
- Date: Mon, 15 Oct 2007 23:11:51 +0200
On 15/10/2007, at 21.27, MSP Graphics wrote:
Most all other RIPs only have one or two options for the
Perceptual
Rendering Intent. That is it is on or off.
That is one of the factors that makes GMG so interesting for an RGB
workflow.
Jim Rich
As someone who has made a great many fine-art prints from RGB
files I will tell you the best position in almost every case for
perceptual rendering is actually "OFF" and that the best rendering
intent is relative colorimetric with some form of shadow
compensation. The widest gamut and best screening is had with the
native (Epson) driver and the color editing and conversion done
carefully in Photoshop. This is the perspective of someone who
actually has to make the prints as opposed to making only
measurements--though I've had to do a lot of that as well.
The way GMG Photoproof profiles works in regard to conversion is to
convert from a specified source (Let's say RGB space) to a specified
destination (printer/paper(ink). Since both the source and
destination is a complete known quantity no guestimates need to be
made in regard to gamut or black mapping. In essence 95% (or so -
depending on the destination gamut of course) of all colors which can
be reproduced in the destination gamut is reproduced colorimetrically
accurate, The rest is rendered as a mix between perceptual and
Absolute colorimetric, but in a user definable way. Lightnes is
scaled in a way which preserves the best of both way of converting
(in essence you get a tine bit more detail in shadows than when using
RelCol w. BPC but no lightening of the midtones).
The net result is "RGB" prints with an amazing gamut which will
exhibit very little clipping (as you can define whether you prefer
detail or clipping when building the profile). And because you define
it before building the profile you can print completely smooth
gradations without weird artifacts.
If you want to know which artifacts I'm referring to try and download
our Pixl testimage (www.pixl.dk > downloads) print through any
printer profile and see the way the gradation get weird when compared
to the original. Not so when printed with a GMG profile.
Best Regards
Thomas Holm / Pixl Aps
- Colour Management Consultant
- Seminars speaker and tutor on CM and Digital Imaging etc.
- Apple Solutions Expert
- Member, ColorManagementGroup.com
- www.pixl.dk ยท email@hidden
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