gif+and+J

Comparing GIF and JPEG File Formats ||   || >
 * Graphics for Web Pages
 * * Two main file formats are used to store images for Web pages, GIF and JPEG.
 * A test graphic with sharp edges and fine lines was created.
 * The image was saved in GIF format and in JPEG format at various compressions.
 * To check the detail, copy and paste the image into Paint Shop Pro.
 * For this type of image, which is the best file format? ||

Edges of green box? || test1.jpg JPEG compression 1 (lowest) File size:14Kbyte || Soft edges to red ring? || test10.jpg compression 10 (low) File size: 8Kbyte || Edges have haloes || test20.jpg compression 20 (medium) File size:6Kbyte || Backgrounds dappled || test40.jpg compression 40 (medium) File size:5Kbyte || General degradation || test70.jpg compression 70 (high) File size:4Kbyte || Image destroyed || test99.jpg compression 99 (highest) File size:2Kbyte || Perfect image? || test.gif The GIF file format compresses colour range, not detail. File size:5Kbyte |||| This image has sharp edges and areas of flat colour, but a limited colour range. The JPEG format distorts this type of image badly, particularly on sharp edges. However a compression of 20 to 30 might be usable. For sharp edges, the GIF format produces the highest detail and smallest file size, and is used for maps ||
 * [[image:https://infoserv2.wkac.ac.uk/campusnetexternal/depts/education/ICT%20yr%201%20lecturers/test1.jpg width="150" height="100"]]
 * [[image:https://infoserv2.wkac.ac.uk/campusnetexternal/depts/education/ICT%20yr%201%20lecturers/test20.jpg width="150" height="100"]]
 * [[image:https://infoserv2.wkac.ac.uk/campusnetexternal/depts/education/ICT%20yr%201%20lecturers/test70.jpg width="150" height="100"]]
 * [[image:https://infoserv2.wkac.ac.uk/campusnetexternal/depts/education/ICT%20yr%201%20lecturers/test.gif width="150" height="100"]]