ATP Threshold settings
The threshold parameter controls the lightness and darkness of the background in an image. Threshold can have a value between 0 and 255, with a default value of 90. As the threshold is increased, more of the darker grays in the image will become black. As the threshold is decreased, fewer of the darker grays will turn black.
Image C was processed with default settings, and threshold set to
60.Image D was processed with the threshold set to 110. Notice that blocks 8, 9, 10 and 11 have a black background in image D and a white background in image C. Since image D has a higher threshold than image C, and the background grays in blocks 8, 9,
10and 11 are not above the threshold 110, the pixels are black. In image C, the background grays in the same blocks are above the threshold of 60, so these pixels are white.
Image C
Image D
NOTES:
∙Threshold and contrast work independently and have no effect on each other.
∙When using the ATP accessory, mixed mode/error diffusion and screening are not available. When using the ATP accessory, the results, when using the Image Enhancement or Noise filter, may vary from the results obtained with standard image processing.
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