03-27-2018, 04:50 PM
Hello,
Total newbie here and using Gimp for scientific purposes. We are following some past work of scientist testing digital photos to determine vegetation cover (obstruction from view). Two author groups used Gimp to analyze their photos (pre 2013). I am unable to recreate their procedures and can't figure out on my own how to count pixels. I have hundreds of photos of grasses and plants taken with a black backdrop. What I need to do is find the ratio of black pixels (the black backdrop) to other pixels (plants). I tried using Threshold to change to BW then using Histogram. I 've also tried using just Histogram. I've tried a bunch of different ways to get to a pixel count. I'm either missing a step or two or am just not understanding the results I'm getting. HELP!!! I can send an image if that helps.
Thank you,
Mo
Total newbie here and using Gimp for scientific purposes. We are following some past work of scientist testing digital photos to determine vegetation cover (obstruction from view). Two author groups used Gimp to analyze their photos (pre 2013). I am unable to recreate their procedures and can't figure out on my own how to count pixels. I have hundreds of photos of grasses and plants taken with a black backdrop. What I need to do is find the ratio of black pixels (the black backdrop) to other pixels (plants). I tried using Threshold to change to BW then using Histogram. I 've also tried using just Histogram. I've tried a bunch of different ways to get to a pixel count. I'm either missing a step or two or am just not understanding the results I'm getting. HELP!!! I can send an image if that helps.
Thank you,
Mo