On 05/12/02 19:42, Andrew Woods wrote: > I didn't assume either to be correct; > To expand (and dig deeper...). I have an iris proof and a digital file > from which it has been printed. It was done for me specifically for the > purposes of evaluating my output device in comparison to it, and as I > understood it, was "proofing" the digital file I had been given from > the generic Euroscale coated v2 space in the same way as I had done > using the 2100 and my new profile. I didn't expect either to be > "correct" nor to imitate a printing press. An IRIS is usually set up to emulate another device (offset, a Cromalin or whatebver), unless it is used for fine art work where it is set up to utilise the best possible gamut on art paper. If the output process this IRIS is set up to simulate is different from the Euroscale Coatedv2 colour space (or ISO 12647-2 Fogra 1 standard which is about the same) then the IRIS print won't be a good (true) representation of the digital file you have sent to it, as the data you send to the printer won't yield accurate results unless the data send to the printer is of the same type/colourspace the printer is set up to similate. If it is not a correct representation of your Euroscale Coated v2 image data, what exactly is it? In short - it's just any other print...
> I was using it as a > "control" print which I had been told (rightly or wrongly) was within > acceptable tolerances. It may be and it may not be (it depends of the tolerances really)... What if it isn't? > I thus thought that by comparing its > interpretation of the known digital file to my profiled printer's > interpretation I could gain insight into the 2100's output. You can, the question is how does your file become a "known" file. How do you know when it appears correct? Without knowing when the image appears correct how can you evaluate the output from a (any) printer? > I know that I don't know if the 2100 is "on(or near) the money". I > don't have authoritative analysis devices (or your knowledge to make > use of them), Not everyone have the toys for this kind of job. > but as a working practice I have always strived to > analyse things from as many points as I have available, Me too. It's just important to understand how many onknown the equation contains BEFORE you try and solve it. > I guess hoping > that I will see the patterns emerge..... Patterns may appear, but you may not notice them, or you may see patterns where there isn't any <G>. Reminds me of that movie with Russel Crowe as the brilliant nobel price winning mathematician seeing patterns in most everything. The name eludes me though. > oh and hope for excellent > advice.... This is the forum to get it. > oh and avail myself of your profile evaluation service. Of course. In fact this is one of the only ways to quantify how a given device actually compares to a reference. > > *Cut (see end) > >> Many people skip the fence and just declare that "My IRIS IS correct!" >> Assuming this, you need to have an ICC profile describing the IRIS to >> be >> able to cross render it on your Epson. Just using a standard ICC >> profile >> isn't good enough if you choose this "the easy way out". Effectively >> you >> need to limit the gamut of the Epson, to that of the IRIS, and the >> only way >> of reliably doing that is to have a profile for both devices. > > So is the Iris capable of delivering a verdict on the digital target in > a way that is comparable to my epson, or is there something about the > process that means they just can't be compared? It can, but to be able to do it you need a profile for both the IRIS and the Epson. Convert your data to the profiled IRIS, and then cross render from the IRIS to the Epson using AbsCol intent. Without the IRIS profile you can never KNOW that you are doing it right... Best Regards Thomas Holm / Pixl ApS - Photographer & Colour Management specialist - Adobe Certified Training Provider in Photoshop� - Imacon Authorized Scanner Training Facility - Remote Profiling Service (Output ICC profiles) - Seminars speaker and tutor on CM and Digital Imaging etc. - Home Page: www.pixl.dk � E-mail: [EMAIL PROTECTED] -- =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
