The analysis of the electrophoresis gel admits sometimes rigorous analysis to extract the information displayed (quantitative PCR, SDS page ...). There are several software able to performing this task as Gelanalyzer (http://www.gelanalyzer.com/download.html). This is a directly executable software, very easy to handle that analyzes three models of correlations between the intensities of spots and their surfaces,depending on the selected marker.
Adapted
from http://www.gelanalyzer.com
Macherki M
E