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general question about web images

what are some of the differences between lossy and losseless compression? and when would it be better to use jpg. rather than gif.  I believe that they are both kinda equal really.
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Jenn0101
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Jenn0101
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Jason C. LevineNo oneCommented:
Wiki pretty much covers it:

http://en.wikipedia.org/wiki/Image_compression

Lossless compression results in huge file sizes but images of better overall quality.  Lossy compression is used in most images you see on the web.

JPG and GIF are nowhere near equal.  GIFs only have a 256 color palette (216 if using web-safe) whereas jpgs can render millions upon millions of colors and thus can produce higher quality images.  JPEG compression is also superior to GIF and you can get a higher quality result at higher compressions than you could with a gif.

The one thing you can do with a gif that you can't do with a jpg is have a transparent color, which makes blending it into a site easier.  However, png supports transparency and is of superior quality to gif.
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Jenn0101Author Commented:
Ty this answered my question!
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