Banding in gradients


#1

Hi Walker
I have posted previously on a slight variation of this issue.
I am linearising the supplied curve for Hahn PhotoRag Baryta using 256step target, Colorport, i1pro2 and PPEv2
The new Warm and Cool curves that I have created print a good test image
But when I blend the new Warm and Cool curves using the Curve Blending Tool (at 18% warm/82% cool) the resultant new ‘Neutral’ curve shows banding in the gradients of test prints.
I have taken the new Neutral curve and put it through the Channel Smoothing Tool at 100% and that worked. It now prints with smooth gradiants. But my question is any idea why? Why would a smooth warm and a smooth cool produce a jagged neutral when blended? Is there something obvious I am doing wrong?
Thanks
Neil


#2

Please show a screenshot your tool with the blending setup if you would.

best,
Walker


#3


#4

this is with Cool curve into ‘Starting’ and warm curve into ‘Blending’


#5

There is nothing in there that should create an issue.

Can you upload all three curves so I can test them here? Sorry for the trouble,
Walker


#6

9800-Hah-PRagBaryta-C-rmp-051218.quad
9800-Hah-PRagBaryta-N-rmp-051218.quad
9800-Hah-PRagBaryta-W-rmp-051218.quad


#7

9800-Hah-PRagBaryta-C-rmp-051218.quad (7.4 KB)
9800-Hah-PRagBaryta-N-rmp-051218.quad (8.6 KB)
9800-Hah-PRagBaryta-W-rmp-051218.quad (7.4 KB)


#8

9800-Hah-PRagBaryta-N18smth-rmp-051218.quad (8.6 KB)

here is the neutral that has been through the Channel Smoothing Tool


#9

I did an 18% blend of C and W (from your upload) and I get something different.

9800-Hah-PRagBaryta-N-rmp-Walker.quad (8.6 KB)


#10

Thanks Walker
That would seem to indicate operator error on my part. That was certainly my assumption to start with. So before posting I carefully did it again (the blending) and still got the same issue. I also got the same issue when blending the same cures in QTR. But I will go back and look at it again, I will try your version and see, thanks again for your time
Neil


#11

Make sure to run the install command each time. I also suggest to make a new curve name for each try. This way you know 100% for sure that you are using the new curve.

best,
Walker