If you can precisely measure the width of your screen or know the screen's exact dimension in pixels, you can calculate the pixels needed to mirror the physical size of the screen on a printed-out copy of the image. Here's how:
Determine the width or length of the screen, depending on which dimension you anticipate being larger on the captured image. There are two ways to do this:
Manually measuring the screen dimension using a physical measuring tool
Calculating via the below formula, if the below details are known (recommend to check your device information if not):
(Pixel width / screen ppi)*72
Convert the above measurement to pixels using a tool like this. Enter the above into the "Resize Images To" property of the form, accessible by clicking the name of the form at the top of the designer window: On your form's connector, check the box to "Send Media Files Separately."
Bear in mind that the specified resizing will be done to the image's greater dimension, either width or length. As a result, this process will only work as long as the intended image dimension is not exceeded by the other dimension. For example, if you have measured the screen width and determine the calculations accordingly, the resizing will apply to the length instead if the length ends up being greater.