We recommend you to use the web version of Green Index. Click the following link, download the file and open it from your downloads. It will also work online:
Download our Green Index Software to calculate GI from your pictures. The password to unzip is: 123456
Tutorial video for the Green Index software:
Please, cite the corresponding literature:
Signorelli S, Casaretto E, Etchemendy-Gamundi M, Bentancor M, Harvey Millar A. The Green Index: A Widely Accessible Method to Quantify the Degree of Greenness of Photosynthetic Organisms. Plant Cell Environ. 2025 Nov;48(11):8027-8043. doi: 10.1111/pce.70102. Epub 2025 Aug 4. PMID: 40760762; PMCID: PMC12502032.
Alternatively, you can use the tables below. Insert your RGB values and get your GI.
NOTE: Please, remove your values after using it, so the spreadsheet is clean for other users. We recommend you to copy your GI values and do all the posterior analysis (means, deviation, etc.) in your own spreadsheet.