I have on one side a set of images in raster, which are not having any spatial reference, and on the other side a grid with spatial references. Each image supposedly fit perfectly in a cell of the grid. I would like, without hazardous manual georeferencing, to use the grid in order to give the rasters spatial references according to the grid references.

Any idea on how I could achieve this ?

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    You want some automatic georeferentiation, which is possible only raster to raster and not raster to vector, as far as I know. If you have the grid then you will need only 4 points per raster, which is not that much(assuming your set of images does not contain a couple of hundreds rasters). If your rasters do overlap you could try "automate->photomerge" from Photoshop and georeference 1 big raster. – alecsx Jun 28 '17 at 6:26
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    There is also a georeferencing tool within QGIS. And you can also manually add a SRID to your image maybe? If you know their bounding boxes it would be great. Also, check out 'world files' on the Internet for your image format. – s.k Jun 30 '17 at 20:52

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