PCX is a format to store images. This format was used in the ZSoft PC Paintbrush graphic editor (one of the most popular programs) for MS-DOS, text processors and Microsoft Word and Ventura Publisher. This format is a less popular analogue of BMP but is supported by such graphics editors as Adobe Photoshop, Corel Draw and others. The algorithm of compression is very quick but is not effective for compression of photos and other detailed computer graphics. Today this format is not displaced by formats which support better compression. These formats are GIF, JPEG, and PNG.