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I am facing difficulty converting between Sentinel GeoTIFF file and JPEG file. I used below command i.e.
gdal_translate -b 4 -b 3 -b 2 -of JPEG -scale inputimage.tif outputfile.jpeg
The problem with this approach is, that if I convert 32*32 TIFF file into JPEG and if the same patch is from 1000*1000 TIFF file and I convert that file into JPEG, then in both cases the same patch looks different in both JPEG files.
From the documentation:
-scale [src_min src_max [dst_min dst_max]]:Rescale the input pixels values from the range
src_mintosrc_maxto the rangedst_mintodst_max. If omitted the output range is 0 to 255. If omitted the input range is automatically computed from the source data.
The smaller patch will have different min and max values (input range). If you want the smaller patch to look the same same as the larger (or vice-versa) pass the appropriate range(s) to the -scale parameter. For example (with totally made up min/max values, you'll need to change these to something appropriate for your data):
gdal_translate -b 4 -b 3 -b 2 -of JPEG -scale 0 1234 0 2345 0 4567 inputimage.tif outputfile.jpeg
