Why is the Group 4 image format found in TIFF, CALS and other formats useful?
Group 4 is the most popular and efficient bitonal (black and white) image compression format. It does a very good job with compression. Very fast algorithms exist for display and manipulation. Why use JPEG? JPEG is the most powerful color image compression method available today. Many people are concerned that it is a lossy format, meaning that image information is discarded when converting a raster image to JPEG. However, the information that is discarded is usually in chrominance and luminance information and is generally not visible to the naked eye when displayed. Because the user has control of the amount of loss, JPEG is one of the few formats that permits the user to control the compression ratio of the information. Thus permitting great compression if you are willing to sacrifice some image quality. GIF and/or TIFF-LZW Issues GIF is an 8- bit palette format and includes transparent, inter-laced and animated GIF variations. TIFF-LZW is part of the TIFF specification. These forma
