So what use is your IT8 target on a RAW file? Also, note that a TIFF file will have a colorprofile applied to the image and a RAW file does not. These operations will not make you loose any latitude. It will be basically the same as a 16-bit TIFF, except that the TIFF has the demosiacing and gamma applied. ![]() That said, I don't feel there is a good reason to save a scan as RAW. Vuescan probably adjust the gamma on the fly to 2.2, but when it saves it writes a gamma of 1. If it is a TIFF, and the gamma is 1 then it is normal that you images are dark. What is the RAW format Vuescan uses? Is it a TIFF? Is it a RAW format that Aperture understands? I will see how it goes after profiling the scanner and calibrating the display. More work but more latitude with the RAW files. ![]() Then again, I could easily make those compensations while importing the files as long as they are consistent and then just put the final tweaks on each individual scan. It just seems like I am doing a lot more work than if I were to save the Vuescan files as 16/48-bit TIFFs. I've adjusted several of the RAW files compensating for exposure and gamma and am getting excellent results. ![]() Hopefully this will address the issue but Ed Hamrick is saying that the RAW files deliver the data from the scanner CCD which has a gamma of 1.0. I've also purchased a display calibrator to make sure that end is covered. I will be mostly scanning 4x5 transparencies and have purchased a IT8 scanner target from Wolf-Faust to profile the scanner for the Fuji film stock used. I'm a reasonably competent scanner operator having scanned using higher-end drum scanners in the past I have been using Vuescan with an Epson Perfection 700 scanner scanning a few prints (b&w and color) which consistently come in to Aperture looking dark in spite of looking very good in Vuescan (tonally balanced with good range).
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