16,772,216 Colors
65,536 colors
For a digital photo, bit depth is the number of colors that can be shown in the image. Because the bits can only indicate one of 2 possible states (0 or 1), the number of colors can only be powers of 2. Some examples of bit depths (and the calculation of the decimal number for those of you who know exponents) for image files are: 2-bit (2^2 = 4 colors), 4-bit (2^4=16 colors), 8-bit (2^8=256 colors), 16-bit (2^16=65,536 colors), and 24-bit (2^24=16,777,216 colors).
16.7 million. 24 bit is also referred to "True Color".
A 32 bit per pixel bitmap will have 8 bits each for red green and blue, and 8 bits for alpha level. So 2^24 colors.
16,772,216 Colors
Most modern digital cameras use 24 bits (8 bits per primary) to represent a color. But more or less can be used, depending on the quality desired. Many early computer graphics cards used only 4 bits to represent a color.
65,536 colors
One bit is 2 possible colors, black, 8bit has a possible of 256
A 24-bit video adapter can display roughly 16 million different colors.
You are actually asking how many colors are possible in 8 bit per channel. 8 bit per channel means 256 colors, 1 bit= 2 colors, 2 bits= 4 colors, 3 bits= 8 colors, 4 bits= 16... 8bits= 256 colors. Since we have 3 channels in RGB color mode: Red, Green and Blue that means that we have 3x8= 24 bits per pixel in an image. 3x8 also means 256x256x256 colors possible. Number of possible colors in 8 bit per channel or 24 bits per pixel image is 256x256x256 colors or in particular exact number of possible colors is 16777216.
An 8 bit colour display can show 256 colours.
A 24-bit video adapter can display roughly 16 million different colors.
the colors of the india flag
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PNG files can be 24 bit per pixel or 32 bit per pixel. The 24 bit variety stores 2^24 or 16777216 colors. The 32 bit variety stores 2^32 or 4294967296 different colors.