A family of lossless compression techniques for black-and-white images, supported by the PDF and PostScript language file formats.įor more information, see Help for the specific Adobe applications. JPEG uses lossy compression.įor the best printed results, choose maximum-quality compression. Recommended for continuous-tone images, such as photographs. Most useful for images with large areas of single color. The following are commonly used compression techniques. Lossless techniques compress the file without removing image detail or color information lossy techniques remove detail.
Many file formats use compression to reduce the file size of bitmap images. To achieve greater dynamic range with or bit images, use the following formats. The standard bit depth for images is 8 bits per channel. To preserve all Photoshop features layers, effects, masks, and so on, save a copy of your image in Photoshop format PSD.
Graphics file formats differ in the way they represent image data as pixels or vectors, and support different compression techniques and Photoshop features.
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