Message
Re: Using a densitometer to make digital negative curves
2017-02-18 by sanking@...
Most QTR profiles allow you to create correction curves either with the GRAY_CURVE= command, or with LINEARIZE.
The easiest way by far that I have found to do this is to insert the log density readings of the printed step wedge directly into the LINEARIZE command. You can also do this with a spectrophotometer, but the log density values are easier to manipulate if there is some inconsistency in your process. LINEARIZE will not install if the density readings are not constantly increasing/decreasing.
Assuming that your prints are not neutral black (and most alternative work is not) it is best to use a color reflection densitometer for the readings. I use an X-Rite 408, which has CMYK and visual readings.
If you have been using GRAY_CURVE and change to LINEARIZE you will probably see a significant increase in the IQ of your digital negatives.
Sandy