Gif's and Jpg's

JPG’s

• A JPG might compress to a smaller file than a GIF (less time to download) but it might take longer to decompress and display.
• JPG is a lossy compression format. You lose image quality.
• JPG compression gives the best results for photographs or images with detail.
• To reduce the size of a JPEG file, apply a small amount of blurring to the image.
• After the image downloads, compression no longer matters.

GIF things

• Use GIF with drawings or line art work.
• Some versions of Netscape choke on transparent GIFs.
• Fix: make the first pixel in your GIFs non-transparent.
• There is no loss of quality in GIF format..
• GIF images can only show 256 colors.
• To reduce GIF file size, decrease the # of colors used and make color areas as large as possible.

Animated Images

• Do not use em.
• They make the page load slow - they use big files.
• Animated images may cause the page to load improperly.
• They're distracting and annoying.
• They chew up processor cycles doing animation.
• Runs at different speeds, depending on the visitor's stuff.
• Crashes older browsers.
• If you use animations anyways, limit the number of times an animation will loop.

Interlaced or progressive images

• Do not use em.
• Irritating
• Hard to tell when the image is done.
• When bandwidth is skinny the image sits half-rendered.
• Intermediate images are sometimes very different from the actual image.
• It's just another special effect that will soon be boring.