The compression of digital files in a format that requires less storage space. Compression techniques are distinguished from each other by whether they remove detail and color from the image. Lossless techniques compress image data without removing detail; lossy techniques compress images by removing some detail. Joint Photographic Experts Group (JPEG) is a lossy compression technique supported by JPEG, PDF, and PostScript language file formats. PowerShot digital cameras store their images in JPEG format, which provides the best results with continuous-tone images, such as photographs, when the size of the file is an important factor.