Localizing changes

I'm not exactly sure what you want, but there's a new filter called Color Range Extractor by Kraellin that may be helpful. The basic idea is to use an impulse curve into a tone curve, and using that to set the alpha... (where the source of the mask can be your channel of choice).

ronviers,

there is no geographical masking in FF. like ssamm said, you can test your original image based on the various channels types and mask that way, but that's unreliable in a multi-colored image. or maybe i shld say there's no really GOOD geographical masking. you can mask out areas of an image by using things like frames with alpha set or simply making a given color in some of the components transparent. ssamm mentioned my recent color range extractor filter and that uses some geographic masking. so, you could look at that. but it's currently very limited.

i also made a 'luminance masking' filter but i forget if i uploaded that one or not

hypothetically, one could make some better geo masks based on profile gradients too, but it would still be difficult to really refine so it would work on every image.

you might also look at the 'squircle' snippet. that has some shapes that could be used. or the one i posted in the threads called 'circle 1a'. that also has some shapes.

the bottom line is that FF just doesnt currently do masking as well as ps or psp. so, you might want to make your filter based on using it with those.

Thanks, Kraellin. It does seem to have some interesting combinations that I may use somehow.
I haven't had time to mess around with your Color Range Extractor filter yet, but it's pretty cool from my first brief look. I was going to make my own version, but keep getting side-tracked...

Hi ssamm and Kraellin,
Thanks for the very helpful info. For my purposes, inter-component and shape effects, the attached method works ok since I really don't care what color the pixels are.

Brgds,
Ron


Pixels shape effects.ffxml

Just curious, are you talking about taking a shape and turning it into a mask for an image???

Well here is a FF filter you can choose to look if you want but. Its a shape that is blurred to get a Gradient effect. Then that goes into a Blend component then the result of that gets blurred again..Its another way but most likly no the only way. The other thing is to many blurs does slow down a filter. Unless there is not much else to the filter itself..

Shaped Blur.ffxml

It does not restrict or constrict the effect to that area it just masks out that area..For different shapes you would have to create your own. But there are some that are in the snippets area along with other filter that use shapes. So you can also look at those for ideas..