Returns the alpha component of a pixel as a value between 0 and 255.
Returns the alpha component of a pixel as a value between 0 and 255.
Returns the blue component of a pixel as a value between 0 and 255.
Returns the blue component of a pixel as a value between 0 and 255.
Returns the gray value of a pixel as a value between 0 and 255.
Returns the green component of a pixel as a value between 0 and 255.
Returns the green component of a pixel as a value between 0 and 255.
Returns the red component of a pixel as a value between 0 and 255.
Returns the red component of a pixel as a value between 0 and 255.
Scales the brightness of a pixel.