[PD] unclamped pix_subtract?

[Spencer Russell]

Never mind, it looks like pix_diff does the subtraction and the absolute value.

On Mon, Jul 14, 2008 at 5:08 PM, Spencer Russell
<spencer.f.russell at gmail.com> wrote:
> I'm trying to implement a background subtractor using pix_buffer to
> store the reference frame, and then subtracting it from the live video
> input, then using that subtraction as an alpha mask for the live
> video. The problem is that pix_subtract clamps the output at 0, but I
> need it to not clamp, and then I can take the absolute value. Is there
> a way to do unclamped subtraction of pix objects in GEM?
>
> thanks,
> spencer
>