crw CRW stands for the RAW image format.This format is gaining a lot of popularity nowadays since a lot of the cameras people utilise ( the single lens reflex cameras ) are using this format. The data coming from the image sensor, in the case of the RAW format, is by far the most basic and unprocessed of all. CRW is also known as digital negatives, the RAW image files have quiet the same use as the negatives used in film photography.
bmp The bitmap image file format or bmp file for short, is a raster graphics image file. It uses a dot matrix data structure to represent pixelated points of color and to store digital image information. The format optionally supports compression and has wide cross platform support on all the major computer operating systems. Because bmp files are raster graphics files, image resolution is constrained meaning images in this format will not scale without loss in quality. This is in contrast to vector graphics images that can scale to arbitrary resolutions.