3.Printer-specific Adjustments
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3.4.4 To Use Only the Black Toner to Reproduce Gray Areas
(To use only the black toner to reproduce black-and-white photos or
gradational images)
Explanation
For printing, only the K toner is usually used to reproduce gray areas of drawing data, lines and text. On
the other hand, all color toners (C, M, Y and K) are used to reproduce gray areas of image data, such as
BMP, GIF, JPEG and TIFF. This provides a deeper gray on the printouts.
The following are examples when image data are reproduced using C, M, Y and K:
• A gray-scale or black-and-white photo is pasted in photo editing software such as Imaging and Paint
Shop Pro, in Internet Explorer, word-processing or spreadsheet software.
• A semi-transparent gray color or gradient of gray is used in the Format AutoShape dialog box on
Microsoft Office.
(The gray area printed out as raster data in the same manner as a photo image is reproduced using C,
M and Y toners, or C, M, Y and K toners.)
Change the option on the printer driver, in order to use only the black toner to reproduce the gray area
where C, M, Y and K are used as described above.
Procedures
(1) Perform PureBlack/Gray threshold value adjustment.
For details of the adjustment procedure, refer to "3.1.2 PureBlack/Gray Threshold Value
Adjustment".
Caution after the adjustment
Nothing in particular
Before adjustment After adjustment
Using all color toners to reproduce black-
and-white photo images (bitmap data)
blends undesired colors in the image.
Using only the black toner to reproduce
black-and-white photo images can
diminish undesired colors.
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