Some simple tasks ends up into a simple script. After trying to create a comparison image, which consists out of some screenshot taken at the same resolution with different application settings, details for example, I finally got mad creating this composed screenshot with GIMP.
The output generated could look like this one showing my blog in three different browsers splitted vertically, from left to right: Safari, Opera, Firefox.
Or splitted horizontally:
Since PHP was already installed on my Mac, I used this to perform the task. Unfortunately only GD was installed and I was to lazy installing ImageMagic, this tiny script is based on GD.
Here is a screenshot of the nice :P interface for selecting the images, which can be found in the gist:
Since I think the code is self-explaining, take a look to the gist below if you are interested: