Images are generally referred to as bitmaps, no matter how you think of them in there original form, jpeg,png,tiff. However you must remember that the size of bitmaps uncompressed, and then when they are in full sized in memory and devices may only have a small amount of memory available to the application. HD Images on a low memory device can easily flood the system and result in "Out Of Memory Error". A single 1920x1080 image in BMP format can be a healthy 8MB. Including camera functions will a application must be handled with care, as the bitmaps take up a lot of memory, especially for rich images the camera on the Galaxy Nexus takes photos up to 2592x1936 pixels (5 megapixels). Loading this image into memory takes about 19MB of memory (2592*1936*4 bytes), immediately exhausting the per-app limit on some devices. Handling this requires careful considerations, read more in the training manual.