I process band ratio in the format of 3*4/4-8, 4+3/7*8, 4-8/4+8. Any body can tell me process or methodology to calculate band ration in any GIS software.
Its band ratio i hope not band ration. If band ratio, then u can calculate by any RS/GIS software like ARC GIS, ENVI, ERDAS. Its nothing but the mathematical operation between multiple bands.
Mahesh Tripathi , maybe a video tutorial would be good for you. For example select from these about computing NDVI in commercial ArcGIS or free QGIS. Calculating NDVI is very common and similar to your case: