Patch for KCurve and KisPerChannelFilter

[Matthew Woehlke]

Дима Казаков wrote:
> I haven't looked throught the code, but i have such a feeling that preview
> is made against the whole unscaled image, isn't it? I think it would be
> enough to apply filters to the smaller scaled down picture that is shown on
> the screen. Of course, there would be some mathematical issues, especially
> with convolution filters, but we could make interface that would allow
> Filter to choose whether it needs whole image for preview. imho.

Someone else will have to chime in with an authoritative answer, but 
AFAIK this isn't true; filters have worked on regions for a long time. 
(And yes there is stuff in place to handle filters that need input 
pixels outside of the output region.)

-- 
Matthew
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