Does there exist software for Linux that will allow me to measure distances between two pixels? Possibly with a zoom feature.
You can install either from most repositories:
sudo aptitude install screenruler sudo aptitude install kruler
sudo yum install screenruler sudo yum install kruler
I'm on KDE at the moment, so here's a screenshot for kruler:
Or if you want to take a rectangle selection measurement, there's xmeasure.
It runs from the terminal and needs compiling first. You can do that by running:
gcc -o xmeasure xmeasure.c -L/usr/X11R6/lib -lX11
In the same directory as where you've saved the
xmeasure.c file, then run:
Here's a screenshot of the output (and compilation):