Tool to transform images into black and white (grayscale). A grayscale image is an image whose colors vary from white to black.
Grayscale Image - dCode
Tag(s) : Image Processing
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Black and white is understood here as a grayscale gradient. For transforming an image into binary black or white (only black and white, no gray), indicate 2 shades of gray, and for the binary exploitation of the result, dCode has a tool for that:
Each color pixel in an image is typically defined by a triplet of red, green, and blue (RGB) values. But it is also possible to define it by a HSV triplet for hue (rather red, rather green, rather blue), saturation (rather bright color or rather grayish) and luminosity/value (rather light or rather dark). This brightness value is generally used to define the position / color of the pixel between black and white and thus obtain a grayscale image.
To calculate this luminosity, several algorithms / color referentials are possible, such as recommendations 709, 601 or 2100 used as a standard in photography or video (and from the CIE Commission Internationale de l'Éclairage).
dCode calculates the brightness value for each pixel in the image and returns a gray pixel of corresponding brightness.
If an error is returned, it may be an altered file, a bad image, or the file format does not match its extension.
Recommendation 709 is used as a standard for HDTV. The luminance is calculated as Gray = 0.2125 * Red + 0.7154 * Green + 0.0721 * Blue
Example: A color representing the color Orange consisting of Red = 255, Green = 127, Blue = 0. Then the value of gray is 255*0.2125+127*0.7154+0*0.0721=145
Recommendation 601 was used as a standard for analogic terrestrial television. Luminance is calculated as Gray = 0.299 * Red + 0.587 * Green + 0.114 * Blue
Example: A color representing the color Orange consisting of Red = 255, Green = 127, Blue = 0. Then the value of gray is 255*0.299+127*0.587+0*0.0114=151