On 5/17/07, Øyvind Kolås <pippin@xxxxxxxx> wrote: > The color mixer in gimp doesn't make sure they add up to 1.0 but makes > sure the output range is 0.0-1.0. But it might be that one requires > pre-normalized data for this to work correctly. That would be auto-level functionality which I'm not sure I want to put into this operation. Not sure whether it's the right place to do levels at all, actually. I think they should come in a separate step if you need them. > To provide full control over such a global color to gray scale mapping > is the ability to > position a grey axis within the RGB cube that the colors a projected > upon. To specify this > you would either need 6 values. Without having 6 values to do it, you > will need additional > levels adjustment to get the resulting values in the 0.0-1.0 range. Why 6? I count 3 for the direction plus 2 for the black- and white-points. > It is possible to find the > optimal orientation of this grey axis, making sure that the > distribution of the resulting histogram has the best possible spread > (not necessarily optimal esthetically, but optimal in > getting the most amount of detail out of an image). Can you give a reference? > regression tested against the RGBA version). Exactly how this will be > implemented is still unclear since there are further pending changes > in the core of how GEGL does it's processing and what is demanded of > operations. So at the moment I'll have to live with RGBA operations? Shouldn't the contrast curve be RGBA as well, then? Btw: The file operations/workshop/envelope.h includes a file vector.h which is not in SVN. bye Mark -- Mark Probst http://www.complang.tuwien.ac.at/schani/ http://www.flickr.com/photos/schani/ http://schani.wordpress.com/ _______________________________________________ Gegl-developer mailing list Gegl-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gegl-developer
