Re: [Gimp-developer] Layer modes: Add vivid light blend mode?

On Mon, Jan 23, 2017 at 12:58 PM, Laxminarayan Kamath
<kamathln gmail com> wrote:
Hi all!

While you guys are at it, I encourage you to try out this formula:

E = (2 * I ) - M

I call it the "Opposite" mode. I derived it from how the unsharp mask
does the sharpening - first run a grain extract and then do a grain

It is not useful in an awful lot of places. But when you want to
de-convolute in a strange way, and you have the procedure or a plugin
which does only the convolution, "Opposite" layer mode can help you
get there quickly!

This is similar to something else I have experimented with, permitting
opacity values below 0% and above 100% for normal mode, this permits
implementing unsharp mask with a blur layer - as well as increasing
saturation by blending a color image with it's desaturated variant.


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