jpg blurring?

JPEG compression is best suited for images like photographs. Images such as yours with washes of continuous color (sometimes called 'spot color') will compress best using GIF or PNG compression.

hth,
bear
 
A general rule of thumb:

Photographic images - JPG
Flat graphics - GIF

For photographic images, JPEG compression will produce far smaller file sizes and better-looking images than the equivalent GIF files. But JPEG files require the viewer's computer to do a fair amount of work unpacking them, so only use JPEG files when GIFs wont do.

If your painting/graphics program gives you a preview before saving, use it!
(e.g. Illustrator or Photoshop - FILE » SAVE FOR WEB)
 
Hey,
If you want GOOD quality images, use PNG. They are clear, smooth crisp images that make GIFs look like the dogs dinner. And, PNG supports Alpha Channels, and the codec is free so developers don't have to pay a royalty, unlike the GIF codec. The only issue with PNG, is that as usual, Microshaft are/were slow to get on the bandwagon. Pre WinIE 5.5 transparency in PNG wasn't supported, IE5.5+ requires the developer to use crappy ActiveX "css extensions" to make IE render PNG's with alpha channels. Strangeley, MacIE works fine, just like all other Browsers. But hey, who cares about WinIE users anyway??
my website (http://QuackingPenguins.bigredrobot.com) uses PNGs exclusively for the UI. To see how cool it is, go there and use the "Customize" page to change to the OSX/Aqua UI, then go to one of the pages that requires scrolling, like one of the Documents in the menu on the Texts page. Gotta love alpha channels.
 
JPEG uses compression to break your image up into blocks of specific patterns that it can use to infer the image. The smaller the compression, the larger the blocks until the point it becomes noticeable. GIF uses up to 256 colors to create an image (plus transparent pixels), so if you have any sort of gradient, like any photograph will, you get severe dithering. If you want that PICT image to come out exactly like that, use GIF with 2 colors.
 
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