The readbitmap package enables users to read the three main general purpose
bitmap image formats (jpeg, png, bmp) without having to specify the image
type directly. This is provided by a single function
read.bitmap, which uses a second function
image_type, which is also exported for users, to identify the
image type of a file using appropriate magic values encoded in the
first few bytes of the image header. Images can therefore have any file
extension.
image_type, read.bitmap