https://imagejdocu.list.lu/ 2026-09-17T00:14:47+00:00 https://imagejdocu.list.lu/ https://imagejdocu.list.lu/lib/tpl/dokuwiki/images/favicon.ico text/html 2019-04-12T13:13:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://imagejdocu.list.lu/wishlist/procedure/alpha_shapes_-_concave_hull?rev=1555067621&do=diff Alpha shapes and concave hull The concave hull of a set of points can be approached using alpha shapes. See the link below for a demo applet. <http://cgm.cs.mcgill.ca/~godfried/teaching/projects97/belair/alpha.html> text/html 2019-04-12T13:13:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://imagejdocu.list.lu/wishlist/procedure/colorizing_algorithm?rev=1555067621&do=diff Colorizing algorithm Change greyscale into colour. It is possible! (Well, kind of...) Colorizing algorithm: Given a greyscale image and colour seeds or a palette from another image, recode the image in colour. There seem to be various methods to achieve this: text/html 2019-04-12T13:13:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://imagejdocu.list.lu/wishlist/procedure/freehand_crop_and_exclusion?rev=1555067621&do=diff Freehand crop and exclusion. If you select a freehand area, it would be nice if “edge” were redefined as the edge of the selection rather than remaining as the rectangular edge of the original image. We could then analyse non rectangular image selections and have an “exclude on edges” to avoid having to painstakingly trace exactly around all items of interest, and then do a “clear outside”. [reported by James Connolly] text/html 2019-04-12T13:13:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://imagejdocu.list.lu/wishlist/procedure/tricubic_interpolation?rev=1555067621&do=diff Tricubic Interpolation When scaling with the -> Image -> Scale command, there is currently no tricubic interpolation. Bicubical interpolation exists of course. When interpolating in three dimensions it looks like it would bicubically interpolate the stack images and then later on cubically interpolate this new stack. (However, I think there is some severe mathematical difference between true tricubic interpolation and this