Dear ImageJ Mailing List, I need an advice and I hope that you can help me. I have a set of binary images and I wish to find out the total surface (in square km) occupied by black pixels , for each image in part. Set scale for my images is: Distance in pixels = 136 Known distance = 20 Unit of lenght = km Scale = 6,8 pixels / km Is there a possibility using ImageJ (such as plug-in, macro)? I look forward to hearing from you. Best wishes, Ion. ________________________________________________________________ Best wishes, PhD Ion C. Andronache Associate member, Research Centre for Integrated Analysis and Territorial Management, Faculty of Geography, University of Bucharest Tehnical Redactor at Journal of Wetland Biodiversity https://www.researchgate.net/profile/Ion_Andronache3/ -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html