Does anyone here know Lightzone (it is free for linux, but not open source, you can download it at http://www.sonic.net/~rat/lightcrafts/). The program is not something great, but it got one interesting feature. I call it filter layers.

There is something like stack of used filters, that you can turn on/off, change opacity, and all values in every used filter, watching the effects in real time. You can also change the order, or even delete unwanted "layers". This is something new, beacause one can use hue/saturation filter, and than channel mixer for B&W. Then, changing hue value, you can simulate the usage of color, photographic filter in B&W photography.

Is it possible in Gimp, and if not, does anyone think about implementing it?

I'm not a programist.
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