pix_diff gives the absolute value of the right image subtracted from the left.<br><br><div class="gmail_quote">On Mon, Jul 14, 2008 at 4:08 PM, Spencer Russell &lt;<a href="mailto:spencer.f.russell@gmail.com">spencer.f.russell@gmail.com</a>&gt; wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I&#39;m trying to implement a background subtractor using pix_buffer to<br>
store the reference frame, and then subtracting it from the live video<br>
input, then using that subtraction as an alpha mask for the live<br>
video. The problem is that pix_subtract clamps the output at 0, but I<br>
need it to not clamp, and then I can take the absolute value. Is there<br>
a way to do unclamped subtraction of pix objects in GEM?<br>
<br>
thanks,<br>
spencer<br>
<br>
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