Many file formats use compression to reduce file size. Lossless formats compress the file without removing image detail or color information. Lossy formats remove detail. Here are some common compression schemes:
LZW. LZW is a lossless compression strategy supported by TIFF, PDF, GIF, and PostScript language file formats. It provides the greatest reduction in file size when used for images that contain large areas of a single color.
JPEG. JPEG is a lossy compression strategy supported by JPEG, TIFF, PDF, and PostScript language file formats. When saving an image in the JPEG format in Photoshop, you can specify the level of compression by choosing an option from the Quality menu (in the JPEG Options dialog box). For the best results, always choose the highest image quality (a setting of 10 to 12).
ZIP. ZIP is a lossless compression strategy that is supported by PDF and TIFF file formats. Like LZW, the ZIP compression strategy provides the greatest reduction in file size when used for images containing large areas of a single color.
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