DPI Converting

[Frantic]

How can I convert between different DPIs? For instance, I'd like to draw a ruler but I've found there is no way to do this with everyone's DPI being different.

So, for me I may have 32 dots per inch but you may have 72....

[Chan]

I'm not real sure because I'm not that great at programming but I do know a little about DPI. As I understand it, an Inch is an Inch is an Inch meaning that if you do anything in Inches it will always = inches no matter what DPI. That goes for monitors, resolution, printers, etc.

[TcM]

Yeah but if he is working with pixels for example if you have 800x600 an inch may be for example 50pixels while I who have 1024x768 one inch may be 100pixels! hmm not sure on how to do that but!!