Convert cals to dib

What is the difference between .cals and .dib?

Description: The CALS Raster Graphic File, having the extension .cals, is a type of image file format primarily used for the storage and exchange of digital images, especially in the context of technical and engineering documents. Developed in the mid-1980s by the United States Department of Defense, the CALS format was part of an initiative to standardize electronic document management and interchange, particularly for military and government applications.; Generic Windows or OS/2 bitmap graphic; similar to a .BMP file, but has different header information; supports 1, 4, 8, and 24 bits per pixel if the image is uncompressed and 4 and 8 bits per pixel if the image uses RLE compression; a 24-bit DIB image contains 8 bits, or 1 byte for each RGB color.