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Given as input a light 874kb jpg, I use gdal_translate -a_ullr (source) to reinject GIS georeferencing :

-a_ullr ulx uly lrx lry :
Assign/override the georeferenced bounds of the output file. This assigns georeferenced bounds to the output file, ignoring what would have been derived from the source file

My command being:

gdal_translate -a_ullr 67.0 37.5 99.0 05.0 ./color_hillsades.jpg ./color_hillsades.gis.tif

While the input is .874MB, the output is 13.5MB, or 15.51 times bigger.

enter image description here

Why does it become so huge ?

What to do to keep it light ?

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Thanks to gdal_translate- why jpg compressed tif is 2 times greater than jpg file?, I found the way :

gdal_translate -a_ullr 67.0 37.5 99.0 05.0 \
               -co COMPRESS=JPEG -co PHOTOMETRIC=YCBCR \
               ./color_hillsades.jpg ./color_hillsades.gis.tif

Input is .888MB, output is a .898MB literally just 1% bigger for a georeferenced tif using JPEG compression. This .tif is loaded properly into Quantum GIS.

enter image description here

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