How can I specify the size and position of a selection in Photoshop CS5?

Question

I'm wondering if I could specify the size and position accurately by input the width and height and the x-y coordinates of the rectangular or ellipse selection. I want to have a very small selected region but it seems hard to obtain by moving mouse manually. As for the wanted position, I can move the selection region using the UpDownLeftRight keys.

Answer 1

With the rectangular and elliptical marquee tools you can specify the size by setting the Fixed size style.

Then you can use the mouse and/or keyboard arrow keys to position the selection.