Canon i-SENSYS LBP6670dn User Manual page 272

[Halftones]
8
Specify the settings for [Color Settings] as the following, as needed.
[Grayscale
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Specify the halftone display method when printing.
You can set it for these data types: [Text], [Graphics] or [Image].
[Resolution]: You can perform printing that combines smooth gradation with edge quality.
It is suitable for printing graphics or graphs that use gradation.
[Gradation]: You can print with a sharp gradation and well-balanced texture, contrasting
light and shade, which is best suited for printing photo images.
[High You can print in fine detail so that the edges of text data can be seen
Resolution]: clearly. It is suitable for printing data containing text and fine lines.
Select the method for converting color print data to grayscale for printing.
This setting is for converting color data to B&W data.
[sRGB]: It calculates the grayscale value using the sRGB standard color conversion
method.