Quote:
Originally Posted by robski
The human eye can see a certain range of colours. The camera can record another range of colours. The phoshors on the CRT can display yet another range of colours and the CMYK pigments of the printer also has it's own range of colours.
Where these ranges overlap, colours are generally faithfully reproduced. It is the areas outside of this boundry that cause the problems. Colour managment is about preventing these colours (clipping) or scaling (re-mapping) colours to fit into the boundary.
I have taken your recent posting and veiwed in PS to show gamut warning ( these are the colour that won't print correctly in CMYK). The attached shows grey where the colour is out of range.
Also attached are diagrams showing the Adobe rgb and srgb colours spaces which your camera or image editing software maybe applying.
The larger area within the loop is the range of colours the human vision system can see. The area in the triangle is the range of colours within that colour space.
The srgb is intended for CRT monitor display of images and Adobergb is intended for Printing with CMYK inks. ( C = Cyan, M = Magenta, Y = Yellow & K = Black )
You can see that there is not a hugh range of blues in either colour space.
The Adobergb has a much wider range of greens and a slightly better range of blues.
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Rob,
Thank you very much for this explanation, it's the clearest guide I've ever read on this topic. I've never been able to get my head around this subject before but your explanation has made it all so easy to understand, even if it's just as hard to get right in the real world.
Thanks,
Duncan