Color problems in avisynth->overlay

I processed depth maps using avisynth 2.5.8 and I found out it causes color degradation

I have a depth map (from http://vision.middlebury.edu/stereo/data/scenes2001/data/imagehtml/sawtooth.html)

And two scripts

1) just_show.avs

v = ImageSource( "depth.jpg" ).Trim(0, -1)
return v

2) overlay.avs

v = ImageSource( "depth.jpg" ).Trim(0, -1)
return overlay( v, v, mode = "blend", opacity = 0.80) 

They have slightly different colors.

just show

overlay

Overlay has chroma component

The cause was in wrong color conversion in avisynth 2.5.8. I downloaded AVS 2.6.0 Alpha 4 [130114] and the problem gone. http://sourceforge.net/projects/avisynth2/files/AviSynth_Alpha_Releases/AVS%202.6.0%20Alpha%204%20%5B130114%5D/

Add path in linux/cygwin and windows

Add path in cygwin /linux

PATH=$PATH:~/your_path
PATH=~/your_path:$PATH

Add path windows

PATH=%PATH%;C:\Your_Path;