In an age of technology, almost everything is being “digitalized”. This sometimes presents a problem, however, when photographs and images are placed on the Web, because many people don’t know or understand what steps they need to take to ensure their pictures are viewed correctly.
Dithering
Most computer monitors display at least 8-bit color (256 colors), but only about 216 of those colors can be found on all browsers and computers. Because of this, computers must make up or “dither” images by mixing colors they have in order to create the odd colors. Unfortunately, this process often results in a banded effect on the images. When creating graphics for the Web, make sure you reduce the pixels per inch to 72 ppi, and always use browser-safe colors. By doing these things, you will ensure that the widest range of viewers will see your images as you intended.
The color in this image does not transition smoothly because it has been dithered. You can see the long band-like lines that run across the photo.
Pixelation
Digital images also face the problem of becoming pixelated. According to Imaging-toolkit.com, “Pixelation occurs when a low-resolution image is enlarged more than it should be, giving the effect where the individual pixels are apparent to a viewer." This effect occurs when a low-resolution image is projected on a large monitor or screen. To prevent blurry pixelated photos, save your graphics at a high resolution so they are more flexible if you need to change them later on. Also, save full color photographs as JPGs, and less complex graphics as GIFs. This will help reduce file size by cutting down on wasted space. Here is an example from www.robinsblog.com.
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Notice how the entire picture is blurry and strains your eyes if you look at it for too long.

