Overall, I'm a bit underwhelmed and frustrated by this process.
#Kodak it8 target reference file skin
The skin tones look better, but at the expense of detail in the shadows. The Ektachrome starts out much more accurate, but I'm not sure the profile helps that much. You can see the red tint in the light greys, bluish tint to the darker grays. Here is the Kodachrome original IT8 scan: My process is:ġ) Scan of IT8 target: Nikon CMS Off, ICE On (Normal), exposure locked, 4000dpi 16bit TIFFĢ) Rotated, cropped, and incorrect profile (sRGB) removed, applied AIM XL prepare gridģ) Ran AIM XL profiler using the Kodak reference file and the 'Weight on Gamut' profiling approachĤ) Applied profile, saved both the original scan and the profiled scan with 'Save to Web' So here's some results from my profiling efforts. A good scanner profile can save you some time, but it's more important to have a good screen-to-printer calibrated workflow so that once you have it looking correct on the screen, you don't waste too many prints fine tuning the output. You'll almost always have to do minor color and tone adjustments before printing. I wouldn't worry too much about getting a perfect scanner profile, unless you're doing scans of copywork or scientific data. For the most accurate results, you need to lock the exposure to whatever was used to build the profile. Scanner profiles can be tricky because most desktop scanners automatically adjust the exposure, which will affect the color as well. Don't try to compare RGB values - RGB values are more or less meaningless except in the context of a profile. The Lab values in the image with the assigned profile should be similar to the ones in the reference file. If you want to verify the profile, assign the profile to the TIFF, then either change to Lab mode in Photoshop or setup the info palette to display Lab values in addition to RGB. I'm hoping that there are some people out there with the 9000 ED scanner thatĬan offer some direct experience on this matter.Īssigning the profile won't change the RGB values. The IT8 scan now have the values specified in the reference data. When I assign the profile in Photoshop I can _see_ the colors change,īut how can I measure this change (as the RGB values are unaffected by a profileĪssignment)? For instance, I'd like to verify that the Dmin and Dmax cells on Is there some way to automatically correct this in the scanning process?Ģ) I'd like to measure how the icm profile that AIM XL generates affects the Mounting-which should have zero transmission-has RGB values in the mid teens. I am left with two questions:ġ) Is this a typical delta between an IT8 target and the desired result,Įspecially for a scanner like the 9000 ED? What I find odd is that the slide I.e., the slide is scanning about 20 RGB points higher (8-bit scale) in the These values give me an RGB delta between the scan and the reference data of: I used this site for LAB to RGB conversion: Values (converted from LAB to RGB) for those cells should be: The lightest and darkest reference bars (Dmin and Dmax, respectively) have theĪccording to the Kodak reference data (obtained from the Kodak FTP site) the When I import the scan into Photoshop, the eyedrop tool shows that I have scanned the IT8 target with the scanner using default exposure/gain 1) A Nikon 9000 ED scanner (with Nikon color management turned OFF)
0 kommentar(er)
