Modify an open source program

There is an software program called Colors Finder 1.2 that can be used to generate information about the colours of pixels in an image. The program is free and available under a GNU GPLv2 licence; I would like someone to modify this program so that I can use the output in Excel. I would like to be able to select and copy-paste information from the program's output table. Alternatively, you could add a button that will export the results table directly into an excel file. I would be happy with either option, so please choose whichever modification is easier to do since I do not have a big budget. If you have any questions, please use the public clarification board. Thanks.