June 3rd, 2009 by Rolf
Joel dicusses “c2g“, a GEGL function new in GIMP 2.6.
“The idea behind c2g is to convert each pixel to B&W using an optimal white balance: the black and white points are calculated for each pixel according to its surrounding, giving the closer pixels more weight (and following a gaussian curve). And basically this mimics the way our human eye perceives the image – how we perceive a color (or grey nuance) depends not only on its value, but on its environment.”
Interesting stuff – and controversly discussed in the comments to that post. Check them out too!
Hi,
the results seem to be very nice for a b/w, which you get without doing anything but starting the filter. What I don’t like is the speed, it takes quite a time befor it’s finished and the image has to much contrast. I like it contrasty normally, but it’s to much.
A little bit tuning to make it faster and a little possibility to change some values and it could be one of the best ways to create a b/w-image. For now I would use it to blend the c2g-version over a desaturated version of the image, maybe in soft light blending mode.
But I’m Impressed.
Greatings
Fornit