CODEWITHSUNDEEP
c++colorsbytergb
torhoehn
torhoehn

Reputation: 95

Convert float color channels (R, G, B) to byte value

I have implement a function that converts a float color channel (R, G, B) to a byte value.

E.g.: 0.0f -> 0 1.0f -> 255

unsigned char RGBImage::convertColorChannel(float f) {

}

How can I get this results in C++?

Upvotes: 0

Views: 2270

Answers (2)

rsethc
rsethc

Reputation: 2694

return f * 255;, the cast from float to unsigned char is implicit because of the return-type.

return (f * 255) + 0.5; to round the value correctly (since you are losing precision), but keep in mind that this is an extra calculation that will bring a performance hit. So if you are converting an entire high-resolution image, as the class name implies, then the additional calculation time may add up.

Upvotes: 3

Alnitak
Alnitak

Reputation: 340055

Trivially (if you'll excuse the C-style cast):

return (unsigned char)(f * 255);

Note that this does not check whether f is correctly in the range [0.0 - 1.0]

Upvotes: 3

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