The Airbrush option in the Pixel brush engine should build-up the stroke as the stylus is held in one place. This functionality works fine with a mouse, and with the wacom ISDv4 E3 screen, but seems to hamper with the Intuous 3. This behaviour was found both on a Windows 7 64bit device, and a Ubuntu 13.10 64bit device. From the forum thread: http://forum.kde.nl/viewtopic.php?f=281&t=120924 Reproducible: Always
Yes, this is a Krita problem that appeared after better tablet support
Ok, we have three options how Airbrushing can work: 1) The brush usually paints using "Spacing" parameter, that is depending on the distance covered by the stylus. When the stylus stops, the timer starts painting dabs. That is how it works now. 2) The brush paints with both "Spacing" and "Airbrush" options at the same time. Sometimes it can generate spurious dabs though, which might look buggy. 3) The "Spacing" is disabled and the dabs are painted only based on the internal timer.
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My intuition is to have the dabs set by timer when using the airbrush, because that is similar to how real-life airbrushes work, however, I am not sure if this is fully expected behaviour. I've added Animtim, Deevad and Ramon to the cc-list, so they can weight in as users. I'll notify gwenouile of it as well.
I always thought "spacing" meant the timer frequency... There is no apparent benefit to using "travelled distance" since that's not how an airbrush works. I vote for number 3.
Should be fixed in commit 142b953c4d0f6b197435cfdcf424f88796e57c4c Author: Dmitry Kazakov <dimula73@gmail.com> Date: Tue Feb 3 13:18:43 2015 +0300 This patch should probably fix Wacom Airbrush devices This patch adds recognition of the device type on Linux, and tries to fix the tangential pressure parameter. If you happen to have an Airbrush device, please do test whether tangential pressure starts working correctly. Most probable bug: the range of the tangential pressure might be wrong, since I don't know in which limits it is linked in the driver. If you see any problems with it, please generate an event log file for moving the button in all directions slowly. Here is a manual how to do that: https://answers.launchpad.net/krita-ru/+faq/2495 Thanks arturg for providing initial patches! CCBUG:343545 CCMAIL:kimageshop@kde.org Please check and if so, close!