CODEWITHSUNDEEP
image-processing
user668074
user668074

Reputation: 1131

Calculating average value of pixels when component type is from 0-255

I would like to convert a pixel value to its average greyscale value. The R,G,B components are 1 byte integers (0-255). Is there a way to calculate the average of the pixels (R+G+B)/3 without casting the components to another type?

I would also like to avoid (R/3 + G/3 + B/3) because of edge cases like (2,2,2) which will become 0 instead of 2.

Upvotes: 0

Views: 62

Answers (1)

MBo
MBo

Reputation: 80187

div is integer division (// in some languages), mod is modulo operation (% in some languages)

Rd = R div 3
Rm = R mod 3
Gd = G div 3
Gm = G mod 3
Bd = B div 3
Bm = B mod 3
Average = Rd + Gd + Bd + (Rm + Gm + Bm) div 3

Upvotes: 1

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