The meaning of bit depth (and why you care)


show more The meaning of bit depth (and why you care) provides you with in-depth training on Design. Taught by Deke McClelland as part of the Photoshop CS3 Channels & Masks: Advanced Techniques show less
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The meaning of bit depth (and why you care)

Having thrashed the topic of masking within an inch of its life, it is time to return to the comfortable, less thoroughly thrashed realm of channels, but is it so very comfortable? So far we have we have been looking at images that contain 8 bits of data per pixel per channel. A single bit can convey one of two states, ON or OFF. So 8 bits permits up to 28 variations which adds up to 256 luminance levels on a channel-by-channel basis. Factoring the three channels required to produce an RGB image and you have 256^3 or 16.8 million possible colors. The name given to the number of bits assigned to a pixel is bit depth, so in addition to the height and width of an image, Photoshop sees a third dimension of bit depth associated with each and every pixel as I have illustrated here.

Given that no single computer screen can display 16.8 million pixels at a time, you might reasonably assume that 16.8 million unique colors are more than enough and quite frankly, it usually is. Every image we hav...

The meaning of bit depth (and why you care)
Video duration: 2m 49s 20h 47m Advanced

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The meaning of bit depth (and why you care) provides you with in-depth training on Design. Taught by Deke McClelland as part of the Photoshop CS3 Channels & Masks: Advanced Techniques

Subjects:
Design Photography
Software:
Photoshop
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