On Sun, Dec 16, 2012 at 02:25:38PM +0000, Andres Muniz wrote: > Yes, you are right, i thought it would show the top and bottom edge of > the gradient.
Well, there's the terminology confusion. In the case of perfecly sharp steps the upper and lower edge of the step coincide but many real-world steps have the flat-slope-flat structure with non-negligible width of the sloping part. > I only found sholer vertical or scholer horizontal. Not both, and no > mention of scharr. Scharr's PhD thesis ‘Optimale Operatoren in der digitalen Bildverarbeitung’ deals with these topics. I'm not sure what parts of if are be available in English. > i now realize that presentation might not be what I was looking for. > Presentation is only cosmetic and when i do a section I only see the > original data with no indication were the highlighted edges are. Yes, that's how presentations are supposed to work. You can do Extract Presentation do get a channel from presentation, but the values are normalized to the range [0,1]. You may want the raw output of the filter – which is produced by the raw C (or pygwy) functions but you can also get it using Convolution Filter and entering the coefficients. Regards, Yeti ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Gwyddion-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/gwyddion-users
