"Transparent zero" works with 16 and 32 bit images in the 1.43i daily
build.
-wayne
On Oct 7, 2009, at 4:28 PM, Mike Cowperthwaite wrote:
> I've been using "Transparent zero" both from the Image Calculator and
> pasting, allowing me to quickly mask out parts of an image. (That is,
> the second operator of the calculator, or the image being pasted, is a
> mask with zeros where I want to keep the image, and nonzero where I
> want
> to force the value to a fixed level; I've been using a masking pixel
> value of "1" to make those areas appear black.)
>
> Previously, I'd been using 8-bit greyscale. Now I want to do the same
> operation on a 16-bit image, and my efforts are not working -- the
> results always seems to be simple copy of the mask image. I can
> convert
> the 16-bit to 8-bit, but then I'm losing resolution (the masked-out
> portions are the ones that show brightest, and the purpose is to
> eliminate those bright features while maintaining as much detail as
> possible with what's left over.)
>
> Is this something that works, but I'm doing it wrong, or something
> that
> just doesn't work? If the latter, can it be made to work?
>
> --
> Mike Cowperthwaite
> Lathrop Engineering, San Jose CA
Locked
