GIF vs JPG format
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Primrose
JPG image - 18KB
Primrose
GIF image - 28KB
Use the jpg format for pictures with a lot of gradations of colors. In this example, the jpg image is a better quality and a smaller file!
Great Fountain Geyser
JPG image - 21KB
Great Fountain Geyser
GIF image - 47KB
Another example showing that the jpg image is a better quality and a smaller file!
LineArt
JPG image - 7KB
LineArt
GIF image - 2KB
If you've got line art or solid colors, the gif format does a better job.

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