trapezoidal distortion in X

Kalle Vahlman kalle.vahlman at
Tue Apr 2 01:54:18 PDT 2013

2013/4/2 Magnus Kessler <Magnus.Kessler at>
> What you describe here is referred to as "keystone correction" in the xorg
> documentation. In particular, you might want to have a look at the man page
> for xrandr. Look for the "--transform" option
> While the documentation doesn't give the exact recipe for keystone correction,
> all the underlying maths have been implemented for quite some time already.

The examples section seems to have a keystone correction xrandr
command to start playing with.

Kalle Vahlman, zuh at
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