Correcting Flat Spots In QTR ICCs
2012-02-25 by remononaz1
I have been working with the Quad Tone RIP and the QTR Stepwedge Tool to try and generate a good ICC for Red River papers using the UT14 ink set. I have the process under control, but I'm not getting results that are fully satisfactory. After generating two ICC (one with the raw outputs from my scanner and one with output adjusted in levels to try and get the calibration scale normalized) I printed a 21 step scale using the ICCs on a common sheet of paper, by copying and moving the scale image over with each print. Since there was room on the sheet, I also printed the scale using printer controls and two other ICCs that seemed appropriate for the paper I was using. The resulting print has five scales. I scanned this and measured the levels of all the scales. None are ideal. The document is posted at https://skydrive.live.com/redir.aspx?cid=6cf998413a2b7d24&resid=6CF99841\ 3A2B7D24!332&parid=root <https://skydrive.live.com/redir.aspx?cid=6cf998413a2b7d24&resid=6CF9984\ 13A2B7D24!332&parid=root> if you care to look at it. The ICC 'QTR_stepwedge FAW print.icc' seems to have the best ramp and range, but it does flatten in the 70 to 80% range. This was my first attempt. The second attempt is 'QTR_UT14_RR-FAW_1400-ADJ-2.icc'. It is no better, being both too dark and having a flat spot in the 60% range. My question is; how do I improve on this? Is there a way to go into the icc files, or edit the text files before loading to QTR, that will correct the flat spots? [Non-text portions of this message have been removed]