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Jumpy pressure sensitivity.

Posted: Wed 14. Dec 2016, 00:11
by Rokisha
I'm on a Windows 10, using a Cintiq 13 HD. And i'm getting getting very clear banding when I try to get smooth transitions. It's as if instead of 2000+ levels of sensitivity i'm only getting about 20. I've disable "Press and Hold" in the Pen and Touch options. I have "Tip Double Click Distance" set to off
and I've tried both enabling and disabling Windows Ink in the wacom tablet properties.
What else might be the cause?

Here is an imgur link to what is happening.
The white to black has clear banding. You can see with the strokes where I have size jitter set to pen pressure there are jumps instead of smooth transitions.

Re: Jumpy pressure sensitivity.

Posted: Wed 14. Dec 2016, 11:08
by wacom1
Pressure is detected first in the pen, transmitted to the tablet, processed by the driver and made accessible for applications. The actual drawing and converting the data into brush width opacity or other tool parameter is done in the application.

Open the tablet properties, go to About -> diagnose and put the pen on the tablet, see the reported pressure in the right column. If pressure is shown only intermittently, with delays or only a few fixed numbers, that would indicate a problem on hardware side (or some software interference slowing the reaction down). - If it looks ok, test pressure in different software and with different tools.

For Photoshop CC on Windows I would try to turn off 'use Windows Ink' and revert to another method for pressure handling:

Create a textfile in a text editor such as Notepad.
Type in the following lines:

# Use WinTab
UseSystemStylus 0

Save the file as a plain text file named PSUserConfig.txt, and save the file into the Photoshop settings folder: C:\Users\[User Name]\AppData\Roaming\Adobe\Adobe Photoshop CC 2014\Adobe Photoshop CC 2014 Settings\ with the name depending on your version of PS. Then restart PS and test.

Re: Jumpy pressure sensitivity.

Posted: Wed 14. Dec 2016, 23:27
by Rokisha
I've created the PSUserConfig.txt already. Diagnose shows a full range of numbers. Let me ask, Is Diagnose the base levels for the tablet or does it uses the Tip Feel setting to adjust? I don't think it's the cintiq itself that's the problem.

Also I was given the suggestion to change PressureCurveControlPoint in Wacom_table.dat file, in an digital artist forum. Would You advise this?

Re: Jumpy pressure sensitivity.

Posted: Thu 15. Dec 2016, 07:42
by wacom1
The driver diagnostics shows the pressure as percentage after applying the tip feel sensitivity setting. If you select diagnostics while pressing Ctrl, you see the pressure values as reported from the hardware. - It is possible to modify the pressure curve for some special situations, but that should not be needed for smooth pressure transitions. - Test pressure in different apps and if you see the problem only in Photoshop, start Photoshop while pressing Ctrl-Alt-Shift in order to reset its preferences.