Question about image size from app developer

Hi
I am developing an android app that prints through eprint, so this is directed to HP Staff
What is the correct size of a jpg image to take up the whole page?
In this app, i am unable to use PDF's, so i want to try using a full page jpg and insert the data onto that, then send the whole page to an eprint email address.
I tried a standard 612 X 792 pixel page (72 dpi), but it only takes up alittle more than a quarter page.
i need it to be the right size for any of the eprint printers.
thanks
 --Karl

1: Decrease the size as you describe.
2. Go to File>New or Ctrl N
3. Make the box 8.5x11. Make sure the other data conforms to your image.
4. Now,holding down Ctrl-Shift, Drag the image to the new box and release the mouse. Your image will be centered in the box.
Note: there may be a method to do this including any adjustment layers, but I usually only do this as a last step, flattening a copy of the working file.

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