Yahoo Groups archive

QTR-Quadtone RIP

Index last updated: 2026-04-28 23:12 UTC

Message

Re: Help with RIP

2017-05-22 by sanking@...

I understand that this process can take a lot of work. If I had saved all of my test prints since I began making digital negatives they would fill a very large trunk. But your data looks pretty good so I think you are almost there.

If you understand and apply Ron Reeder's curve generation method it will work fine. You might also consider the two following methods for more automated ways to create a correction curve for QTR.

http://www.davideisenlord.com/?p=229
Directions are included in the download provided by David Eisenlord.

http://www.botzilla.com/blog/archives/000544.html
ChartThrob

Richard's spreadsheet for creating curves is also very good, but like everything else one must learn to use it.

Using either of these methods you generate a correction curve, and then insert the input/output values in the CURVE_K= line (in my single gray value system), or in the GRAY_CURVE= line with other types of profiles.

There are ways to use ColorMunki and other spectro with LINEARITY, but going there now might be confusing at this point in your journey. I personally prefer to use lab values (taken with an iOne) or log density ranges (read with a reflection densitometer), used with the LINEARIZE= command. But LINEARIZE will only work if your values are constantly increasing or decreasing, with no large bumps in the range. If any of the values are out of tolerance LINEARIZE is not able to create a curve.

Sandy

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.