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
• Delivered-to: email@hidden
• Delivered-to: email@hidden

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!

Yours has a nice blue background and green type!

Whose "perception" was used to turn R66 G0 B255 to R0 G81 B106?

--
Martin Orpen
Idea Digital Imaging Ltd

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