how does one invert an alpha channel in gem ?
i've created an alpha channel from the rgb channels, but need the
channel to be inverted. somehow i can't seem to find a way to do this...
hope it is just sleep deprivation and i'm simply overlooking the
obvious... :)
thanks in advance,
rene
Maybe you can convert alpha to a color, then invert the colors, then
convert back to alpha.
.hc
On Oct 11, 2009, at 6:42 PM, rene beekman wrote:
how does one invert an alpha channel in gem ? i've created an alpha channel from the rgb channels, but need the
channel to be inverted. somehow i can't seem to find a way to do
this...hope it is just sleep deprivation and i'm simply overlooking the
obvious... :)thanks in advance,
rene
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As we enjoy great advantages from inventions of others, we should be
glad of an opportunity to serve others by any invention of ours; and
this we should do freely and generously. - Benjamin Franklin
[pix_invert]...i think... Cheers
Chile
2009/10/11 rene beekman r@raakvlak.net
how does one invert an alpha channel in gem ? i've created an alpha channel from the rgb channels, but need the channel to be inverted. somehow i can't seem to find a way to do this...
hope it is just sleep deprivation and i'm simply overlooking the obvious... :)
thanks in advance,
rene
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that inverts the entire image, not just the alpha channel...
On Oct 14, 2009, at 05:35, Jose Luis Santorcuato wrote:
[pix_invert]...i think...
Cheers
Chile
2009/10/11 rene beekman r@raakvlak.net
how does one invert an alpha channel in gem ? i've created an alpha channel from the rgb channels, but need the
channel to be inverted. somehow i can't seem to find a way to do
this...hope it is just sleep deprivation and i'm simply overlooking the
obvious... :)thanks in advance,
rene
Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
-- http://www.chilemigra.cl http://arselectronicachile.blogspot.com http://www.myspace.com/santorcuato
pix_gain 1 1 1 -1 should do this. although I think there is a bug in some gem versions. and maybe you have to use something like 1 1 0.9999 -1 to get it to work. marius.
2009/10/14 rene beekman r@raakvlak.net:
that inverts the entire image, not just the alpha channel...
On Oct 14, 2009, at 05:35, Jose Luis Santorcuato wrote:
[pix_invert]...i think...
Cheers
Chile
2009/10/11 rene beekman r@raakvlak.net
how does one invert an alpha channel in gem ? i've created an alpha channel from the rgb channels, but need the channel to be inverted. somehow i can't seem to find a way to do this...
hope it is just sleep deprivation and i'm simply overlooking the obvious... :)
thanks in advance,
rene
Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
-- http://www.chilemigra.cl http://arselectronicachile.blogspot.com http://www.myspace.com/santorcuato
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Hans-Christoph Steiner -
Jose Luis Santorcuato -
marius schebella -
rene beekman