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In-Depth on Bit Depth
Aman looking at book "bit" in computer language refers to the smallest amount of information that a computer can understand. It is an electronic pulse that contains one of two characters. It contains either a 1 or a 0 and can either signal the command "on" or "off." Bit depth refers to the number of bits found in a graphics file or the number that can be displayed on a monitor.

Pixels, which make up a monitor's screen to display an image, are made up of bits. The more bits that are contained in the pixel, the greater the bit depth. The greater the bit depth, the more colors can be displayed at one time. This is also true of a graphics file. Bit depth of a graphics file indicates the amount of color in that file. As you might expect, greater bit depth means greater file size. A 4" x 5" RGB photo (24-bit depth) will have a bigger file size than a grayscale image (8-bit depth) of the same size and resolution.

Below is a chart that shows how many colors and bits are contained in each of the electronic color modes. The number of channels refers to the number of "plates" of color that a file contains.slug

Color Mode
Bit Depth
Channels
Colors
Bitmap
1-Bit
1
2
Grayscale
8-Bit
1
256 (254 grays, black & white)
RGB
24-Bit
3 (R, G and B)
16.7 million
CMYK
32-Bit
4 (C, M, Y & K)
16.7 million
Indexed
8-Bit
1
2-256 colors

 

 

 

 


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