create bilevel image
convert color to grayscale
convert color to grayscale using an orange filter
convert color to grayscale using a red filter
convert color to grayscale using an infrared filter
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imageFilterBlackWhite( $image, 128 ) create bilevel image |
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imageFilterGrayscale( $image, "normal" ) convert color to grayscale |
imageFilterGrayscale( $image, "orange" ) convert color to grayscale using an orange filter |
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imageFilterGrayscale( $image, "red" ) convert color to grayscale using a red filter |
imageFilterGrayscale( $image, "infrared" ) convert color to grayscale using an infrared filter |