The OCR library Microsoft provides has some limitations. One of them is the maximum resolution of 2600 x 2600 pixels.
Most mobile cameras do have a higher resolution. For the moment, there are two ways to get around it:
- adjust the camera settings of your favorite camera apps while taking photos for RandR to be below this resolution
- just use the built in capture function (hitting the camera button starts it)
We will add a function to RandR that will resize your other images properly in a future update.