1 . Graphics file formats comparison

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There are many type of image and images/graphics file format. The most popular type of image file that are used on internet are as follows:

JPG (Joint Photographic Experts Group)
JPGs have become the de facto standard image of the internet because they can be compressed so much. A typical JPG can be compressed at a ratio of anywhere from 2:1 to as high as 100:1, depending on your settings. Particularly back in the days of dial-up internet, JPGs were the only viable way to send image information.

However, because of the lossy nature of JPG, it is not an ideal way to store art files. Even the highest quality setting for JPG is compressed, and will change the look of your image, if only slightly. JPG is also not an ideal medium for typography, crisp lines, or even photographs with sharp edges, as they are often blurred or smeared out by anti-aliasing. What is potentially worse, is that this loss can accumulate—saving multiple versions of artwork can cause degradation with every save. Even so, it is common to see these things saved as JPG, simply because the filetype is so ubiquitous.

JPGcompressed

GIF (Graphics Interchange Format)
The images saved in this format lose a lot of color information by being reduced to 256 colors (8 bits per pixel). That makes it not such a good format for photographs and large images but ideal for storing graphics with a limited number of colors such as clip art.

PNG (Portable Network Graphics)
PNG was created as a free and better alternative to GIF. This format supports animation and transparency, too, but is no longer limited to 256 colors. It has the advantage of truecolor (16 million colors). It can be used for editing photographs, since it doesn’t lose quality through repeated savings like JPEG. However, JPEG is still preferred for transferring and distributing photos because of the reasonable file size. A disadvantage of PNG is that some of the Internet browsers do not support this format yet.

Small file size
Widely supported format