A constant that indicates the conversion will not apply dithering.
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kvImageConvert_DitherNone = 0
The following shows an 8-bit RGB image converted to a 1-bit planar image with vImageConvert_Planar8toPlanar1 using kvImageConvert_DitherNone:
To learn about converting an RGB image to grayscale, see Converting Color Images to Grayscale.