Bitness Of The Image, What Is The Meaning Of This Term?

Bitness of the image, also known as bit depth, is a term in the computer graphics sphere, which refers to the number of bits used per one pixel. There is a direct relationship between depth and the number of colors image can store: higher the depth, more colors can be stored.

To make everything clear here is an example:
Picture 1 has a depth of 1, using the formula “2^depth” we can determine how many colors can picture store - 2^1=2, which means that this picture can store only 2 colors (black and white). In contrast, picture 2 with depth 8 can store 2^8=256 colors, the difference is obvious. Not to mention, higher values of image depth will result in increase of image size. It happens due to the fact that more color information has to be stored for each pixel.

Which image depth should you use? Well, everything depends on the material that you have. In cases of images with couple of colors (logos, simple designs) high depth isn’t required, however in cases of gradients you should use high bitness, of course if you don’t want to screw the image up.

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