Note that just because an image is compressed doesn't imply that it is small. A 1750x2500 pixel image could be fairly small if using PNG compression on an image that is mostly solid colors without a lot of noise. However, in memory it still needs to be held in its uncompressed state, which is roughly 17.5 MB. If you end up loading a few images of this size you will cause the app to run out of memory (Fun fact: my first Android phone allowed apps to use up to 16 MB of RAM).