XCF is a file format from the raster graphics category developed by GIMP. The specified extension is considered the standard image format specifically for the GIMP graphics editor. In its characteristics, XCF is very similar to the PSD raster graphics format, which is native to Photoshop. XCF files do not support the function of saving the "history of cancellations", however, for other characteristics, they are highly praised by experts. So, they retain channels, transparency, layers, guides. Data compression in this format is lossless. The name of the format is associated with the organization of experimental computing (eXperimental Computing Facility) of the University of California, Berkeley.
PBM is a raster image category file format. It is a compact single-bit black and white image. In other words, this is a simple format that allows you to store black and white pictures. It can be easily formatted into text. In this raster image format, if the pixel is a byte of one, it represents black pixels. When it is a byte from zero, it represents white pixels. The format is referred to as the Portable Bitmap Image file type. How can I open this format? To do this, use programs such as Adobe Photoshop CS, some versions of ACD Systems, as well as Newera Graphics Converter Pro, Corel PaintShop Pro X6. The file has 1 bit per pixel. PBM is a type of PPM format. PBM, that is, Portable Bitmap, is part of the Netpbm graphics package along with a couple of other formats: PGM, that is, Portable Graymap; PPM, i.e. Portable Pixelmap. Occasionally, these three formats are combined under the general name PNM (Portable Anymap). These are intermediate files used in conversion processes supported by Portable Bitmap Utilities (these are applications that have open source code). The PBM format is linked in black and white bitmap images. In PGM, grayscale bitmaps. PPM stores color bitmaps.