DPI and resolution math

[Ducol]

Hi!

Please, help me to dig through the math, I don't see how it works
(not enough math understanding abilities, yet).

As an example consider one bitmap which is 200 pixels horizontally and 100 pixels vertically. If this bitmap was printed at 100DPI then it would measure 2 inches by 1 inch. If however the same bitmap was printed at 200 DPI then it would only measure 1 inch by half an inch.

I don't understand the meaning of this phrase (and the similar one above):
"it would only measure 1 inch by half an inch" (maybe its a language issue).
What does "measure n inches by m inches" mean?

How to arrive at 2 inches by 1 inch given 200 pixels horizontally and
100 pixels vertically? Is there a formula or it is a basic math?


Thank you!

[Epy]

__ by __ means width by height, so it means 200 pixels wide / 100 dots (pixels) per inch = 2 inches wide by 100 pixels high / 100 dots (pixels) per inch = 1 inch high