A halftone bitmap is a 1-bit bitmap that has been dithered for black and white printing or display. If the bitmap is originally 1-bit but is not black and white, this method changes it to black and white. Specify color resolution such as bits per pixel, dithering method, palette options and order of colors. This method can rotate the color wheel in either direction. A 180-degree rotation in either direction changes each color to its complement.
Positive rotation takes red toward green, green toward blue, and blue toward red.
Negative rotation has the opposite effect. Inverts the colors in the bitmap, making it like a photographic negative. This method can also be used to invert the color of a 1- bit bitmap, making the black white and the white black. Increases or decreases the contrast of the bitmap. Intensity values ideally follow a logarithmic progression, because the eye perceives changes in intensity as being equal when the ratio of change is the same.