The above only applies to a creating a new file in Photoshop not editing an existing photo.
The 72 dpi is a tag embeded by Canon into the Jpeg. Sadly this is not configurable on the camera. Scanning the web the most common suggestion is to create a photoshop action script that opens the jpeg and changes the resolution without resampling and then resave it.
Otherwise if you know a programmer he could write a simple program to modify the tag.
I assume you are not using raw otherwise ARC could configured to whatever dpi you require.
Last edited by robski; 06-11-10 at 22:35.
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