Operation Manual

Working with bitmap color modes | 565
4 Move the Intensity slider.
If you want to view different parts of the image, you can drag the image in the Preview window.
The Intensity slider is not available for the Halftone conversion option.
Changing bitmaps to duotones
To convert an image to a duotone, you change a bitmap to the grayscale color mode and enhance it using one to four additional colors,
giving the image greater tonal depth.
The following four variations of the color mode correspond to the number of additional inks:
• Monotone — a grayscale image colored with a single tone
• Duotone— a grayscale image colored with two tones. In most cases, one is black and the other is colored.
• Tritone — a grayscale image colored with three tones. In most cases, one is black and the other two are colored.
• Quadtone — a grayscale image colored with four tones. In most cases, one is black and the other three are colored.
The four color mode variations. From left to right: the original image, monotone, duotone, tritone, and quadtone.
Adjusting tone curves
When you change an image to a duotone, a tone curve grid that represents the dynamic tone curves that are used throughout the
conversion is displayed. The horizontal plane (x-axis) displays the 256 possible shades of gray in a grayscale image (0 is black; 255 is white).
The vertical plane (y-axis) indicates the intensity of a color (from 0 to 100 percent) that is applied to the corresponding grayscale values. For
example, a grayscale pixel with a color value of 25 is printed with a 25-percent tint of the color. By adjusting the tone curves, you can control
the color and intensity of the tone that is added to an image.
Saving and loading inks
You can save an adjusted duotone tone curve and ink settings and then load them for use with other bitmaps.
Specifying how overprint colors display
When you change an image to a duotone, you can specify the colors to overprint when you print an image. Overprint colors are used to
preserve color integrity when inks overlap. When you display the image, each color is applied on the screen in sequence, creating a layered
effect.
You can view all instances in which the colors you choose for the duotone conversion overlap. Associated with each instance is the color that
is produced by the overlap. You can also choose new overprint colors to see how they overlap.
Duotones hold their color ink information when you save to Encapsulated PostScript (EPS), Portable Document Format (PDF) and CorelDRAW
(CDR) file formats. Other file formats don’t support duotone images.