The perceptual intent doesn't map in the same way , but many photographers use Relative Colorimetric intent almost exclusively , especially those who shoot colour critical subjects for advertising briefs. Regards, Bob Marchant.

From: bobphoto(a)dircon.co.uk Date: Mon, 11 Feb 2008 22:47:08 +0000 To: eci-en(a)lists.callassoftware.com Subject: Re: [ECI-EN] ECI-EN] RGB to CMYK On 10 Feb 2008, at 22:05, Roger Breton wrote: Hi Roger. Several points here, First that of softproof versus proof. In our workflow , softproofing is an essential part of the process. We are essentially a visual industry and the client as well as ourselves need to be able to make quick and accurate (as possible ) judgements using a monitor as the first point of reference. Many many years ago ( around the year 2000 from memory , but I'll look it up ) , the Digital Imaging Group of the Association of Photographers tried to commission a set of 'generic' RGB > CMYK conversion profiles from an industry expert for free distribution as we couldn't get the information we needed from prepress and prepress houses, but were constantly asked for CMYK files by both them and our clients .. This was of course well before the ECI profiles were available. We encountered the same problems that still prevail in some areas today. The assumption was made by our non photographic expert that softproofing didn't have to be accurate because only hard proofing and press mattered.There was also the prevailing opinion at the that all photographic images needed a perceptual rendering intent to provide the best results. So in the end ,many of us learnt about colour management , profiling , CMYK conversions , ink limits , black generation etc from the ground up in order to get the results we needed, and in the process became a little more cautious and critical about the existing "industry standards " . At the time "industry standards" was often considered to be an oxymoron :-). For colour critical work , many of us need to keep the accuracy that relative rendering can provide by not shifting all of the colours in our images , however minutely , in order to maybe preserve a little more detail. When any problems do occur due to clipping , there are several workarounds. In order for our workflow to be efficient , we need profiles that provide decent softproofing . Today I've been shooting whiskey. When you push a lot of light through a bottle , you start to produce some very vibrant yellows that look like a million dollars in RGB but fail miserably in the CMYK destination space. With art director , account director , client etc all looking over our shoulders , we haven't got time to use profiles that require printed proofs to evaluate the consequences of any RGB to CMYK conversion. We prefer to use profiles that accurately ( as accurately as possible of course given the limitations that exist ) predict the proof and press target on our (Eizo) monitors. We also prefer profiles that don't do too much damage to saturated colours . Dare I say it , but we also prefer at times to have a little more control over black generation and TAC( which is why we often use our own profiles built using Profilemaker and FOGRA data.) I realise that this may be taking things a little too far for some , but many photographers suffer from at least a little OCD when it comes to their precious images <BG>. We are evaluating the ECI profiles based on the FOGRA 39 data , and will now look at the Basicolor v2 coated profile ( thanks Paul ! ) but in the meantime still use profiles chosen on a job by job basis ,and proof to ISO standards as a final part of the process. Sorry ..long answer to a short question. Kind Regards, Bob Marchant. _______________________________________________ ECI-EN mailing list ECI-EN(a)lists.callassoftware.com http://lists.callassoftware.com/mailman/listinfo/eci-en