http://granite.sru.edu/~ddailey/svg/feComponentTransferGreen.svg
In it I tried inverting all three color channels in the ellipse on the right
by
<feComponentTransfer>
<feFuncR type="table" tableValues="1 0"/>
<feFuncG type="table" tableValues="1 0"/>
<feFuncB type="table" tableValues="1 0"/>
</feComponentTransfer>
Results are as expected in that black à white (and vice versa), red à cyan
(and vice versa), blue à yellow, and yellow à blue.
However gray does not map to gray (I had to use stroke=#bbb to get
apparent identity of the unfiltered and filtered colors
And green does not map to magenta rather to a quite washed out pink; and
magenta maps to a light yellow green.
Im assuming this has to do with the gamma of my monitor? (presumably
different for Macs and PCs?). Sigh
I was hoping not to have to learn about
that.
What gamma adjustment might one apply, perhaps by chaining another instance
of feComponentTransfer after the first, so as to properly preserve the
mappings black à white, red à cyan, blue à yellow, and yellow à blue, and
yet to add green ßà magenta? I fooled around with a few, and though I was
able to adjust the green magenta scale using gamma, it also seemed to muck
up the other mappings as well. I would hope that this rather task is not
impossible.
Cheers
David
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