Message
Re: Help with RIP
2017-05-21 by sanking@...
Ron's method of determining the input/output data to place in the GRAY_CURVE= line (or CURVE_K=line in my single gray value system where all curves follow the K) works fine.
But before you linearize you need to adjust the Ink Levels of the four blocking inks so that you get Dmax at Step 100%, and paper white, or very close to it, at Step 0%. For any given process, this is determined by, 1) standard exposure time, and 2) negative DR (density range).
Once you can print a step wedge that has paper white at Step%, and DMax at Step 100%, you then create your correction curve.
When you complete the correct curve, place the input/output values in the CURVE_K= line, and you should at that point be able to print a digital negative and make a good print.
Don't forget to run the Install command for your QUAD printer every time you change the .txt file. And check the Terminal script, and the Library, to make sure the profile actually installed. QTR .txt profiles are very sensitive to exact language and naming so don't assume anything, always check that the profile actually installed.
Sandy