Adjusting the white point controls the brightness of the picture's display on screen. To use the Gamma Correction dialog box, adjust the midtones by entering a new value in the Gamma field or by dragging the slider. A higher value produces a darker picture, overall. Although modifying gamma gives you some control over picture display, differences between Windows and Mac OS may still cause issues.
Windows uses a higher gamma value 2. Desaturate - To convert a color picture to a black-and-white picture while leaving the color mode and lightness value of each pixel unchanged. For example, it assigns equal red, green, and blue values to each pixel in an RGB picture to make the picture appear grayscale. Invert - To invert the gray values of each channel in a picture. This effect is recommended for 1-bit, grayscale, and RGB pictures.
The inversion of the black channel usually results in images that are mostly black or mostly white. Threshold - To convert color pictures to black and white, without using gray. Enter a value in the Threshold field or drag the slider; all pixels lighter than the threshold value are converted to white and darker pixels are converted to black.
Posterize - To modify the tonal levels for each channel in a picture to produce special effects. To use the Posterize dialog box, enter a new value in the Levels field or drag the slider. For example, choosing five tonal levels in an RGB image results in 15 colors five for each of the three primary colors.. Use the Blend Mode drop-down menu to select a blend to apply to the image. Use the Opacity drop-down slider to select a the opacity percentage to apply to the image.
Clipping paths are especially useful when you are attempting to isolate the picture's subject from its surrounding background in the original picture file. You can create clipping paths from scratch in QuarkXPress or QuarkCopyDesk, or you can use embedded path or alpha channel information to create clipping paths.
Choose Item to crop an image to the box boundaries. Choosing Item does not create a clipping path; it simply crops the picture to its box.
Choose Item to crop an image to the picture component boundaries. Choosing Item does not create a clipping path; it simply crops the picture to its picture component. Choose Embedded Path to clip a picture around a path already embedded in the picture file. Choose a path from the Path drop-down menu if the picture file contains more than one embedded path.
Choose Alpha Channel to clip a picture around an alpha channel already embedded in a picture file. Choose an alpha channel from the Alpha drop-down menu if the picture file contains more than one embedded alpha channel. Note that using a clipping path around an alpha channel will create a hard edge rather than a blended effect.
If you want a semi-opaque blend, use an alpha mask. See " Working with alpha masks. Choose Non-White Areas to create a clipping path based on the picture's subject. Depending on the image and the value in the Threshold field, the clipping path will outline a non-white figure within a larger white or near-white image or vice versa.
The Non-White Areas option works best when the unwanted parts of the image are much lighter than the subject itself or vice versa. Choose Picture Bounds to clip a picture around the rectangular "canvas area" of the imported picture file. This includes any white background areas saved with the original picture file. Enter values in the Top , Left , Bottom , and Right fields to determine the outset of the clipping path from the picture's boundaries.
Positive values increase the outset, and negative values decrease the outset. The green path in the Preview area corresponds to the clipping path, and the blue outline corresponds to the picture box.
You can use image-editing applications to embed paths and alpha channels in an image. If a picture storing this information is imported into QuarkXPress, you can access the path and channel information using the Clipping tab of the Measurements palette on.
For more information, see " Tools. You can also manipulate clipping paths with the controls in the Measurements palette. To change a point from one type to another, use one of the following three buttons:. Symmetrical Point : A symmetrical point connects two curved lines to form a continuous curve. The result is similar to a smooth point, but the curve handles always rest on a straight line through the point and are always equidistant from the point.
Smooth Point : A smooth point connects two curved lines to form a continuous curve. The curve handles always rest on a straight line through the point, but they can be distanced independently. Corner Point : A corner point connects two straight lines, a straight line and a curved line, or two noncontinuous curved lines.
With curved lines, the corner point's curve handles can be manipulated independently, usually to form a sharp transition between the two segments. Straight Segment : Makes the active segment straight. Curved Segment : Makes the active segment curved. Various options in the Clipping tab let you invert a clipping path or specify whether a picture is clipped using outside edges only, or whether the picture is contained within its box.
You can create special effects such as making visible regions transparent and transparent regions visible, allowing holes within a path, cropping the picture to the edges of the picture box, or removing portions of the clipping path that fall outside the box borders. Unlike clipping paths, which produce a smooth edge primarily used for separating a foreground image from a background image, alpha masks can include transparency information to subtly blend a foreground image into a new background.
To work with alpha masks in QuarkXPress, you must first create an alpha mask in an image-editing application such as Adobe Photoshop. You can then use the alpha mask in QuarkXPress. To work with alpha masks in QuarkXPress, you'll need to save them with the picture in a format that supports alpha channels. Quick links.
My Photoshop. I get the gray postscript box. JPEG's seem to be fine. Any ideas? If you are getting a gray box then your EPS files are there because you would not get a gray box at all if the EPS were not importing. JPGs show up because XPress can read the pixel data and give you the low res preview.
All text within files must be converted to outlines with the outline set to zero to eliminate the need for fonts. PageMaker From the menu select: "file"; "print" Select the page to convert.
Select the "option" button. Select the "Write Postscript to file" box. In the Commercial Printing Tools sub-menu, select the fonts sub-menu. In the window that will open you want to check "Embed True Type fonts when saving publication" and UN-Check "Do not embed common system fonts. Glossary Print Specifications Testimonials Tutorials. Connect with Us:. This is because Adobe uses PostScript to render images onscreen and does not need a preview image for you to see it.
Now let's do something different. Open the CD. You couldn't do this if it was saved as a binary file. The image below shows a close up of the code. EPS files are PostScript.
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