Hello Lee, thanks for your swift reply. I actually converted using relative colorimetric with BPC (which gives a good visual match) but I'm interested if the colour L1, a0, b0 actually exists in any print colour space. If I look at the data set for ISOCoatedv2 the L a b value for C100, M100, Y0, K100 is 7.88, 5.79, -5.94 (the lowest L value I can find). How am I getting 1, 0, 0 on conversion? When I convert using absolute I don't get a good visual match along with a 14% tint of yellow in the white point. But I still get an L a b value which I'm sure I shouldn't be able to achieve L5, a0, b3 What gives?!? On 30 Jan 2013, at 10:55, Lee Badham wrote: Hi Jimmy, It looks like your rendering intent is set to perceptual in your colour settings. Goto Edit->Color Settings. Click on More Options (or Advanced depending on Photoshop version) Set the Intent to 'Absolute Colorimetric' Click 'OK' Regards, Lee On 30 Jan 2013, at 10:42, Jimmy Tinker wrote:

Yeah right! I have a file, supplied in USWebCoatedSWOPv2 that, when I run a dropper over it in Photoshop, appears to have a L a b value of 1,0,0 in its darkest shadow. This shouldn't be possible should it? When I convert to ISOCoatedv2 the value stays the same, which definitely shouldn't happen should it? Could anyone explain this to me? _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/lee.b%40bodoni.co.uk

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Lee Badham www.bodoni.co.uk | www.presssign.com