For Canson Platine, I’ve now done three linearization iterations (51-step, 129-step, 129-step a second time) as I try to improve a bit on some very slight banding in a very smooth gradient on my test image (using Dual K4 on my 7900). I’m trying to understand something I’ve observed in the output from the Error Corrector Tool…
Here’s the Cool data from the first 129-step execution of the Error Corrector Tool:
You can see that there is a shift darker in a good bit of the curve. To try to get this a bit closer to the target linear state, I printed a new 129-step target with my linearized quad, read the data and did another iteration through the Error Corrector Tool. Here’s what I got:
Now you can see that the Error Corrector has produced a slight shift lighter in the same portion of the curve.
What causes this? Or maybe a better question is what are the factors that could contribute to this? So far my other papers (Canson Rag Photographique, Canson Baryta Photographique and Hahnemuhle Gloss Baryta have resulted in almost perfect matches between target and actual data. And interestingly, the Warm curve for Platine is also a perfect match. It’s just the Neutral and Cool curves for Platine where I see this. I understand that the measurement instrument has a certain amount of “jitter” in the readings, but I don’t think that would explain these two curves. Any thoughts?