Color image to black and white converter
www.rapidtables.com › convert › imageHow to convert RGB to grayscale. Gray RGB color code has equal red,green and blue values: R = G = B. For each image pixel with red, green and blue values of (R,G,B): R' = G' = B' = (R+G+B) / 3 = 0.333R + 0.333G + 0.333B. This formula can be changed with different weights for each R/G/B value. R' = G' = B' = 0.2126R + 0.7152G + 0.0722B. Or
Grayscale - Wikipedia
https://en.wikipedia.org/wiki/GrayscaleConversion of an arbitrary colour image to greyscale is not unique in general; different weighting of the color channels effectively represent the effect of shooting black-and-white film with different-colored photographic filters on the cameras. A common strategy is to use the principles of photometry or, more broadly, colorimetryto calculate the grayscale values (in the target grayscale colorspace) so as to have the same luminance (tec…