How do I re-set a BMP file's resolution (DPI) indicator?

Posted by Joshua Fox on Stack Overflow See other posts from Stack Overflow or by Joshua Fox
Published on 2011-01-01T16:33:53Z Indexed on 2011/01/01 16:53 UTC
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image

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graphics

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resolution

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bmp

I have a BMP tagged as 299 DPI resolution. I'd like to change that to 99 DPI.

Importantly, the DPI marker in a BMP has no structural meaning. An image has a certain width and height in pixels. The displaying application can show the image at any width in inches.

So, the DPI is just a hint.

However, I am dealing with some third-party software which behaves differently depending on this marker, so I need to re-set it.

I will appreciate suggestions on how to do this programmatically (especially in Java) as well as in GUI graphics tools (e.g. Gimp).

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