How do RGB values from 0 to 1 get converted to a number from 0 to 255?

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Anna 2014-8-28

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回答： Tabitha 2014-8-28

Is the RGB value simply scaled to a number from 0 to 255 to determine the colour of a pixel on the screen?

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Image Analyst 2014-8-28

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RGB images have 3 color channels (planes). The values in each plane can be in the range of 0-255 if you want to display them.

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Adam 2014-8-28

It is a simple linear mapping. I don't know off-hand whether [0.5 0.5 0.5] maps to [128 128 128] or [127 127 127], but the scaling is definitely linear.

Image Analyst 2014-8-28

编辑：Image Analyst 2014-8-28

The color of the pixel is 3 numbers for R, G, and B. If you're displaying them on the screen, they must be uint8 which means they'll be in the range 0-255. Of course you can work with any range you want (0-1 or -999 to +12345 or whatever) or even floating point values internal to your program - nothing wrong with that. But to display you'll need to scale into the range 0-255 and cast to uint8.

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