However, color shifts can occur when moving the image from one page or program to another. As a result, PICT or PICT2 images are best used for on-screen or multimedia presentations rather than for printing. Nearly all desktop publishing programs provide for a proprietary file format. For example, in PhotoShop, you can save a graphic as a PhotoShop graphic that can be read only by that program. When you save a graphic in a proprietary format and later convert it to a generic version for export, some of the unique characteristics of the image may be lost.
Proprietary formats require that the native application be present in order to read the file.
Compressed graphic files are merely traditional graphic files that have been made smaller and require less computer memory As a result of the compressions, these files are not will-suited for printing documents. A GIF image is a format used by many commercial on-line services. The smaller compressed file size of a GIF is an advantage when the image must be transmitted over a modem, but the resolution is usually only appropriate for on-screen viewing. GIF format is mostly used for publishing images in HTML on the World Wide Web. JPEG is a compressed graphic file format most suitable for on-screen use.