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Chapter 9. Pictures > To apply a custom contrast setting to a picture:

To apply a custom contrast setting to a picture:

Choose the Item or Content tool.

Click a color bitmap picture or a color or gray scale TIFF, JPEG, PICT, Windows bitmap (BMP), PCX, GIF, PNG, or PhotoCD picture.

You can't adjust the contrast of an EPS, a WMF, a 1-bit (black-and-white) picture, or a color TIFF imported with the 16-bit/8-bit or 32-bit/24-bit Color TIFFs setting in Edit > Preferences > Preferences > Application–Display. (If you've imported the picture already using that setting, choose 8-bit Color TIFFs, then reimport the picture).

Choose Style > Contrast (Cmd-Shift-C/Ctrl-Shift-C). The availability of contrast options will vary depending on the picture file type.

Option-click/Alt-click the Apply button to turn on continuous Apply.

For a color picture, choose a color Model (HSB, RGB, CMY, or CMYK). Uncheck any individual box for a Color if you don't want it to be modified.

Make any of the following adjustments:

To posterize the picture, click the second-to-last icon on the left side of the dialog box .

Figure 1. Normal Contrast

Figure 2. Posterization reduces the number of grays in a picture to black, white, and four gray levels in between.


To adjust the contrast manually, click the hand icon, then drag the entire contrast curve toward the upper left or lower right corner . To restore the picture's original contrast values, click the sixth (normal contrast) icon.

Figure 1. A picture with the contrast curve shown in the next figure

Figure 2. The contrast curve being moved with the hand tool


Choose the pencil tool, and draw a custom curve.


Check Negative to create a negative of the picture.


Try using any of the tools pictured in , below.

Figure 3. The left side of the Picture Contrast Specifications dialog box

Click OK.

Note: As with cropping and rotating, it's better to flip a picture in its original application than in QuarkXPress—it will print and redraw more quickly. The flip commands flip the contents of a box. A picture can be modified in its flipped position. (To flip a Bézier box, and not its contents, see page 302.)



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