images
- Auteur de la discussion rito43
- Date de début
WRInaute occasionnel
Quelques détails sur ce qui a été dit plus haut:
"The type of an image can have a drastic impact on the file size. Use these guidelines:
. PNGs are almost always superior to GIFs and are usually the best choice. IE 4.0b1+, Mac IE 5.0+, Opera 3.51+ and Netscape 4.04+ as well as all versions of Safari and Firefox fully support PNG, including transparency. IE versions 4 to 6 don't support alpha channel transparency (partial transparency) but they support 256-color-or-less PNGs with 1-bit transparency (the same that is supported for GIFs). IE 7 and 8 support alpha transparent PNGs except when an alpha opacity filter is applied to the element. You can generate or convert suitable PNGs with GIMP by using "Indexed" rather than "RGB" mode. If you must maintain compatibility with 3.x-level browsers, serve an alternate GIF to those browsers.
. Use GIFs for very small or simple graphics (e.g. less than 10x10 pixels, or a color palette of less than 3 colors) and for images which contain animation. If you think an image might compress better as a GIF, try it as a PNG and a GIF and pick the smaller.
. Use JPGs for all photographic-style images.
. Do not use BMPs or TIFFs."
"The type of an image can have a drastic impact on the file size. Use these guidelines:
. PNGs are almost always superior to GIFs and are usually the best choice. IE 4.0b1+, Mac IE 5.0+, Opera 3.51+ and Netscape 4.04+ as well as all versions of Safari and Firefox fully support PNG, including transparency. IE versions 4 to 6 don't support alpha channel transparency (partial transparency) but they support 256-color-or-less PNGs with 1-bit transparency (the same that is supported for GIFs). IE 7 and 8 support alpha transparent PNGs except when an alpha opacity filter is applied to the element. You can generate or convert suitable PNGs with GIMP by using "Indexed" rather than "RGB" mode. If you must maintain compatibility with 3.x-level browsers, serve an alternate GIF to those browsers.
. Use GIFs for very small or simple graphics (e.g. less than 10x10 pixels, or a color palette of less than 3 colors) and for images which contain animation. If you think an image might compress better as a GIF, try it as a PNG and a GIF and pick the smaller.
. Use JPGs for all photographic-style images.
. Do not use BMPs or TIFFs."
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