Re: CMYK spaces used for document creation
Re: CMYK spaces used for document creation
- Subject: Re: CMYK spaces used for document creation
- From: Martin Orpen <email@hidden>
- Date: Mon, 2 Nov 2009 20:44:19 +0000
On 2 Nov 2009, at 19:28, Andrew Rodney wrote:
On Nov 2, 2009, at 12:20 PM, Martin Orpen wrote:
The major difference between the two procedures is that the
superior proof was produced using a device link profile as well as
a different CMM.
And you tested the same device link in CS4?
Don't see the point?
I was using this example to prove that the banding could not be blamed
solely on errors in the profile or problems with the destination
printer.
CS4 users can't create device links so being able to apply them is of
very limited use.
I have tested Photoshop with device links however. I wrote an
AppleScript to create a test chart:
< http://www.idea-digital.com/index.php/code/34-applescript/48-idea16777216
>
And then converted this from one RGB working space to another using
different device links both in and out of Photoshop and then used
another AppleScript to count the number of clipped pixels.
There was more clipping with the Photoshop conversions compared to
those converted using Argyll.
You'll also note that when you convert from a big space like ProPhoto
to a smaller RGB working space that there are real problems dealing
with imaginary colours which Photoshop routinely clips. Device link
conversions will reveal the imaginary ProPhoto blue primary for what
it really is.... black...
Which is another feature of my printed test pages -- the darkest blues
are awful, requiring Perceptual Intent WITH black point compensation
to allow Photoshop to apply a kludge and turn L values < 1 into
something that a human would appreciate as vivid blue.
--
Martin Orpen
Idea Digital Imaging Ltd
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