When to use JPEGS
JPEG (pronounced J-peg) is a highly advanced image format that preserves your images quality at the utmost priority. Instead of storing RGB index color values, which can be rendered poorly on other people's computers and video cards, JPEGs store light wave information about the color. When the image is loaded into memory and rendered for display on you computer, your computer generates the most accurate RGB value on the fly to best render the image on your computer monitor. Since this method is very complex, there is no internal compression done to JPEGs before they're saved. In order to combat the problem of files size, the creators of the JPEGs format decided to use a germ of fractal compression on the saved file to make it smaller this compression is highly effective, but keeps JPEGs from ever being "interlaced" because the web browser can't begin displaying image information until the entire image is decompressed. It could be argued that JPEGs take longer to render, because they have to be decompressed before being displayed, as where GIFs can begin rendering immediately because their compression is built into their design.
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