Is a real Grayscale image always 8 bit per pixel indexed?

1. Are grayscale images 8-bit?
2. How many grayscale values does an 8-bit image contain?
3. What is the pixel value of grayscale image?
4. How many shades of gray are possible in an 8-bit image?

Are grayscale images 8-bit?

An 8 bit grayscale image has 256 tonal options (2 to the 8th power) compared with the 2 tonal options of a 1 bit bitonal image. The tones of a grayscale image with a bit depth of 8 ranges from 0 (black) to 255 (white) and all the 254 shades of gray in between. depths ranging from 8 to 24 bits per pixel or higher.

How many grayscale values does an 8-bit image contain?

The number of gray levels, or the dynamic range, of a grayscale image is 2 to the power of the number of bits used to encode the image. For example, in an 8-bit image the number of possible gray values a pixel can have is limited to 256, ranging from pure white to pure black.

What is the pixel value of grayscale image?

For a grayscale images, the pixel value is a single number that represents the brightness of the pixel. The most common pixel format is the byte image, where this number is stored as an 8-bit integer giving a range of possible values from 0 to 255. Typically zero is taken to be black, and 255 is taken to be white.

How many shades of gray are possible in an 8-bit image?

Grayscale images.

The capture of 8-bit grayscale information (providing 256 shades of gray) is sufficient, since studies have shown that a person can only distinguish 32 to 64 shades of gray on a display screen.