Hi Graeme graeme-at-touchdigital.co.uk (Graeme Bulcraig)::4/10/04::9:06 am:: GMT+0100
<snip> > Anyway, was talking to geezer from BASIC ICC colour and new being >shown new version of software. > (Neil and Thomas...- your names were mentioned).. ;-) >Anyway, he informed me that I should ALWAYS be calibrating monitor to >D50, as per our viewing booths etc. D50 as well. It would be interestig to know who said that. Today I spoke to Hanspeter Harpf at color-solutions [basICColor makers] and he tells me he does not tell a client what it must be, but always asks for an opinion, testing both. [To set a group of screens to the same appearance we always need a spectrophotometer (not a colorimeter) and either D65 or D50, betweeen does not work as well.] > I was always under the impression (obviously I was wrong!) that >monitor -at- D65 = viewing lighting -at- D50. I think you were right you should trust your eyes IMO. test it out. Remember that luminance is very important too. Some prepress guys are used to D50, they used it for a long time. Almost everyone I do the test with sees a viewing booth (at D50) image match a screen (D65) image . In all my clients, only one guy saw D65 as cool and went for 6000K or so. Incidentally, we cannot actually achieve true D50 with either lightbox or screen. The only real D50 is on the roof at Kodak Rochester at noon on a certain kind of day. With basICColor Display and their special grey card [NOT with incident eyeone head] you can actually read the lightbox and set the screen to exactly the same spectrally measured white. I've tried it, of course. The resulting screen looks yellowish to me. [Of course you cannot expect to truly match screen and proof in the same field of view - your brain can't deal with it]. > > Have I gone mad? or was this an old argument / idea that is now dead. D50 screen cal is now dead IMO. >I found some reference to this from Stephen Marsh a few months ago. So >Adobe RGB is a D65 space, but ECI's spaces are D50? there is a good theoretical argument for all workingspaces to be D50 G2.2. Saves a calculation step. I asked profile guru Steve Upton this question last week, he said it's theoretically true but the calc, is very minor so we should not worry. >We have been using ISO Coated icc profile for cmyk conversions for >some time now to good results. We are also about to shift over to GMG >COLOUR PROOF software next week, proofing files to ISO COATED and/ or >DP10 standards. gmg, eh? I got trained on that a few months back by gmg. nice kit, shame about it not running on Mac. workingspace white point has no relevance to monitor white point. In the background all ICC is actually based on D50. > > Should we now be calibrating EVERYTHING to D50? try it? I think you'll see a yellowish screen. I just tried it and I do, I get used to it but if I look from box to screen I have to adapt a lot. >We have also been having some issues recently regarding monitor / >proof matching. Some older monitors just don't seem to want to >calibrate correctly, even after several attempts..with BASIC and EYE >ONE MATCH 2.0. Basic ICC guru was explaining that the magenta / green >shift in CRT tubes can cause this problem. Should we then just ditch a >3 yr old LaCie 22" CRT? probably, yes 3 years is a long time in imaging use. give it to the secretary, I hear they do this each 6 months at Disney. [nice to have the budget] > > Hope someone can shed some light on the above (preferably D50 light) well in the world of ICC the light shed is always D50 really, you have to trust your eyes here. a reflected D50 just does not match a monitor D50 to my eyes, nor to those of ANYONE I've ever done the test with. Best Regards Neil Barstow Consulting in Imaging & Colour Management http://www.colourmanagement.net/ http://www.apple.com/uk/creative/neilbarstow/ =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
