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Despite what you may see in any PS dialogs, images don't have a DPI as it's a printer setting....dots per inch....the 'dots' being dots of ink.

(And before anyone say's anything when I say 'printer' I refer to that lump of cheap plastic sat on a desk with the extortionately expensive ink in it....not the guy down the road that will 'fit you in' after his lunch.)

If you mean PPI as in Pixels Per Inch then yes, by all means you can change it but it won't affect the size of the image as its a value used by the printer to determine how 'big' to print your image.

You can however re-sample the image using PPI as one of the re-sample values in the settings, but in doing so you will PERMANENTLY lose those pixels thrown away by the process.

Re-sampling back UP from a down-sampled image will not retain the same 'quality' as the original.

In short, PPI has no affect on digital images but can be used for re-sampling.

Re-sampling should be avoided at all costs as loss of 'quality' is not preventable.

So in a word, no, I wouldn't touch it.

Regards.

MrTom.