Hello Kent, StraboTools does Color Index and fabric analysis. Glazner, A. and Walker, J.D., 2020. StraboTools: A mobile app for quantifying fabric in geology. GSA Today. v. 30, https://doi.org/10.1130/GSATG454A.1. Andreas ——————————————————————— Dr. Andreas Möller (Associate Professor – Geochronology) Department of Geology The University of Kansas 1420 Naismith Dr., Slawson Hall G186 Lawrence, KS 66045 - USA - +1 (785) 864-1447 amoller@ku.edu https://geo.ku.edu/people/andreas-moller * Chair of Graduate Admission - Geology * President – KU International Faculty and Staff Council From: "msa-talk@minlists.org" <msa-talk@minlists.org> Reply-To: Kent Ratajeski <kent.ratajeski@calvin.edu> Date: Tuesday, February 4, 2025 at 12:28 PM To: "msa-talk@minlists.org" <msa-talk@minlists.org> Subject: [MSA-talk] using Photoshop to find modal %'s and color index I assume it should be possible to use Photoshop to do image analysis of rocks, e.g., modal %'s and color index from photographs of rock slabs, scans of thin-sections, etc.). When I use the eye-dropper tool to select light-colored areas, it picks up lots of reflections from cleavages. I tried messing around with the contrast, but this didn't really work. Also, how could all the variations in color through the sample be simplified to a few colors in preparation for modal analysis? Anyone have any experience with this? I'm sure there is a published paper or two out there, but just some handy tips would be great. Thanks. Kent Ratajeski --- Dr. Kent Ratajeski Lecturer and Dice Mineralogical Museum Director North Hall 081 Department of Geology, Geography, and Environment Calvin University 3201 Burton St. SE Grand Rapids, MI 49546 (616) 526-6769 https://calvin.edu/directory/people/kent-ratajeski