shader graph image processing

greyscale Lightness

(max(R, G, B) + min(R, G, B)) / 2.

0.21 R + 0.72 G + 0.07 B.

Thresholding an image is the process of making all pixels above a certain threshold level white, others black.

●Convert to greyscale

●Grayscale = (R+G+B)/3

●// 0.21 R + 0.72 G + 0.07 B.

●If (Grayscale > thresholdValue)

●Image = 1

●Else

●Image = 0

new_value = old_value + brightness

●Refers to the amount of color or grayscale differentiation that exists between various image features in both analog and digital images.

●Images having a higher contrast level generally display a greater degree of color or grayscale variation than those of lower contrast.

new_value = (old_value - 0.5) × contrast + 0.5

Inverting the sample values in the image, produces the same image that would be found in a film negative.

new_value = 1 - old_value

new_value=old_value1.0-gamma.

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