Re: When black is white (or blue is black) was: CMYK spaces used for document creation
Re: When black is white (or blue is black) was: CMYK spaces used for document creation
- Subject: Re: When black is white (or blue is black) was: CMYK spaces used for document creation
- From: Martin Orpen <email@hidden>
- Date: Wed, 4 Nov 2009 17:03:05 +0000
On 4 Nov 2009, at 15:49, Karl Koch wrote:
now we are getting somewhere and this thread becomes interesting
again.
You show the amount of ignorance that is common with the common user!
I'm glad you appreciate that.
You try to convert from one to the other RGB working space – and
both are matrix based. In a matrix based profile there is only one
way of converting (not quite true, but good enough if we talk Adobe
Photoshop): relaive colorimetric.
You can´t expect to convert out-of-gamut colors this way, so that
they would show detail after conversion.
When building an ICC-DeviceLink profile, you can specify different
renderings, e.g. image based in the case of Argyll. This seems to be
the case in your idiot example. If I do a "normal" perceptual
compression, this is the result:
http://files.me.com/basicc/aec8yi
Yes, it is easy – if you know what you are doing!
Excellent, I thought my version was good -- if I asked the client to
ignore the dark green background...
Yours has a nice blue background and green type!
Whose "perception" was used to turn R66 G0 B255 to R0 G81 B106?
I'm beginning to think that this simple conversion is not as easy as
the colour management consultants led me to believe.
You have my permission to use this test image in your future product
releases.
--
Martin Orpen
Idea Digital Imaging Ltd
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