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Batch Mode DPI Setting Change

Jun 10, 2014, 13:27
Post: #1
Batch Mode DPI Setting Change
Hello,
I'm about to take thousands of images of documents with my DSLR. The final images must be at 400 dpi and my camera outputs 300dpi by default. Is there a way, perhaps command line, to change dpi on a batch of thousands of images?

Let me know. Thanks.
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Jun 10, 2014, 15:18
Post: #2
RE: Batch Mode DPI Setting Change
I can't find a way in Gimp to retrieve or set the DPI programmatically. In any case using Gimp for this would be pure overkill. There are likely programs around here that can tweak the print definition information directly in a JPG or PNG file.

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Jun 10, 2014, 16:31
Post: #3
RE: Batch Mode DPI Setting Change
A few big if's coming up

Assuming that your images are some sort of RAW format.

Then maybe with a suitable gimp plugin UFRAW or DCRAW there is a small chance that the BIMP plugin will see them, then you can render them same size with an altered DPI.
Not here. This is just a bunch of jpegs as an example.

screenshot http://i.imgur.com/NKEv58a.jpg

An alternative (with the same if's) is XnViewMP which will batch convert, possibly to a tiff format, with a changed DPI.

screenshot http://i.imgur.com/iTYLesR.jpg

Seems there is a colour shift however.
screenshot http://i.imgur.com/kxKh4YC.jpg

so it is try and see

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