GNOME Bugzilla – Bug 55405
Jitter correction for hand-drawn curves
Last modified: 2004-12-22 21:47:04 UTC
When using a digitizer tablet, drawing a curve slowly--especially large curves--tends to introduce natural jitters in an otherwise smooth curve. The proposed method for correcting jitters is to have the user draw their curve; then, analyse the curve for sudden jumps; finally, the curve is rendered (hopefully, the jitter corrector keeps track of the user's pressure as the user stroked the curve). There should be some sort of dialog box to control (1) whether the jitter corrector is on, and (2) its jitter threshold.
I think this is a reasonable item for the wishlist. Note that you can probably get most of the benefits by blurring or drawing on a zoomed in canvas. Austin
You can suppress most of the jitter by increasing the Suppress value in the Tablet configuration section of your X server.
This looks like a duplicate of bug #55366 that I reported a bit earlier (feel free to mark one of them as duplicate of the other if you think it is appropriate). Modifying the configuration of the X server is not really a solution, because it does not allow the user to change the jitter threshold dynamically. It is necessary to exit all applications and re-start the X server for this change to take effect, so this cannot be used to draw different curves with different jitter settings. Also, this only works for XFree servers (not for other OSes or X servers) and only if used with a graphics tablet. Adding some jitter correction in the Gimp could be useful for mouse users.
With a Wacom Intuos tablet, that has a slick surface, I have found that taping a sheet of construction paper, or some other uncalendared, matt-finish, with a paper weight somewhere around 80 lb, (i.e., "rather stiff") does not interfere with the surface detecting the position or pressure of the pen, yet furnishes sufficient friction to dampen out many line irregularities. I know, suggesting a hardware fix among a lot of software types will get me damned in some fashion, but there are isolated and rare problems that do not require a software patch. I know. it absolutely boggles my mind. Ghee, whiz.... GRO
Reassigning to current CVS because it's a wishlist item.
One more try to assign it to current CVS...
*** This bug has been marked as a duplicate of 55366 ***