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130.
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This is a 3-element tuple that controls how much of the red, green, and blue channels will be placed into all three channels of a fully desaturated image. The default is based on the constants used for the luminance channel of an NTSC television signal. Since the human eye is mostly sensitive to green, more of the green channel is kept then the other two channels.
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131.
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Returns an im.matrix that tints an image, without changing the alpha channel. `r`, `g`, and `b` should be numbers between 0 and 1, and control what fraction of the given channel is placed into the final image. (For example, if `r` is .5, and the value of the red channel is 100, the transformed color will have a red value of 50.)
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