You will easily find the relation between patch identifiers like GS0 in the target and in the reference file. If you take a photo of this IT8-Scanner target then you KNOW the L values and you can ADJUST your photo by Curves in Lab mode for approximately the same results (theoretically …). Note: these are not accurately gray (a=0, b=0) but the diffe- rences for a,b are not relevant in a photo. I also wrote to Taz, and asked about it, but I"ve not heard back yet.īelow are the CIELab values for the bottom line grayscale in MY ACTUAL reference file. But I searched high and low in Google, but couldn’t find it. Taz Tally did refer to his 10 step target. I haev a goodly assortment of "test" image files, but what I’d like to get is a 10 step grayscale with RGB values defined in advance by the supplier. Then if I printed that out, I’d have the printer profile to contend with.Įven though all my "stuff" is profiled, I’d still be off in what I’m looking for. Then of course, I’d have the scanner profile to contend with. Title: Re: Profile Prism v8.I looked over the data file for the IT-8 target I have – remember this is a paper target, not a film target – and I did see the LAB data there.īut the problem is that I can’t easily identify which of the data are for the grayscale, and, even if I could, how would I take that data, and convert it to RGB? Conversions are easy for an image opened in Photoshop, but the only way I can get such an image is to scan the IT-8 target. Even a half millimeter off and you're measuring part of a different patch than the one you intended. That's the same size as the color patches on the IT8 so each patch has to be measured with absolute precision. The only problem with that device is the 8mm eye hole. The ColorMunki is up to the task (accurate enough). Overall, mine reads a bit darker, perhaps because I used a darker backing when measuring. The data files are comparable and they produce very similar profiles. Being at least 15 years old, (although stored in a cool, dark place) I question whether the data files for them are still accurate. Just out of curiosity Mike, how much different were the values you read with your spectrophotometer versus the values supplied by Wolf-Faust? Do you think that a ColorMunki would be up to the task of spot-reading patches from an IT-8? My original from you is getting pretty old and scratched up, but I acquired a couple from stuff packaged with old AGFA flatbed scanners that are in near pristeen condition. This will be an file which he will supply with any target purchased from this batch and subsequent batches of targets. Mike has a Spectrophotometer ( a big word for rectal thermometer) which adds perfection to the TXT file that comes with the target. It naturally and usually comes with a TXT file with the same number that should show in the Profile Prism working window. Mike's latest batch of IT-8 targets are from a batch that carries the (R130730) Charge number. These text files tweak the IT-8 for accuracy. TXT files which have the same number as the Target. Then came the IT-8 with many many more patches for accuracy. Years ago, in the beginning, (sounds like some book I read a long time ago), there was the paper target followed by a Q Kodak target. Where does Mikes Calibration come into it? Please explain this statement "Mike which will mean you can use his calibration of it rather than the Wolf-Faust version"įrom memory, the two targets I received (a few years ago, and a few years apart), were only the Hard Copy, Title: Re: Profile Prism v8.42 released: Aug 5, 2014 The most noticeable is the Matte paper improvement in the red family. Some change is barely noticeable, and some changes are readily visible.
I have a full envelope of test prints and lay them out under the Ott light. still am, but 8.42 is a truer color with the Wolf Faust file or the ddi file. So I got a new target, and I have the new ddi created file that goes with it. Mike deemed it 12 years old from the charge number. I can vouch for what Terry says, first hand. "Includes a new data file for most recent PP-included color target (R130730-ddi) derived with our in-house spectrophotometer."Īlternatively one can be ordered directly from Wolf-Faust You can order a new IT 8 target from Mike which will mean you can use his calibration of it rather than the Wolf-Faust version Mike said:. I think it's time for a new one - bad cat! Shocked