2022

A Guide to QuarkXPress 2022 | 393
Threshold value in the field or drag the slider. The value specifies which
pixels to modify - those with values lower than the threshold are considered
negative and those with values higher than the threshold are considered
positive. The pixel values are then inverted.
Diffuse - Shuffles pixels so the picture looks less focused. ●
Emboss - Makes areas of the picture appear raised or stamped. ●
Embossing Effects - When the Emboss filter is applied, you can specify the ●
direction from which to raise or stamp the picture using the Embossing
Effects filter. Click the directional arrows in the Embossing Effects dialog box
to apply different directions. For example, clicking the upper-right arrow
might specify that when you pushed a stamp onto an object, you pushed
slightly to the right, smearing the stamp in that direction.
Edge Detection - Displays only edges of the picture, suppressing the ●
remaining colors. The Edge Detection dialog box provides two mathematical
methods for determining edges: Sobel and Prewitt. The Sobel method might
be more precise because it considers more surrounding pixels in its
calculations.
Trace Contour - Thinly outlines the transitions of major brightness areas for ●
each color channel, producing a black-and-white outline of the picture. You
have the option to invert the results as well.
Add Noise - Applies random pixels to a picture to simulate pictures shot ●
using high-speed film. The filter applies an even pattern to shadow tones
and midtones while adding a smoother, more saturated pattern to the
picture’s lighter areas.
Median - Reduces or eliminates the look of motion on a specified region of a ●
picture. The effect searches pixels of similar brightness, and replaces the
central pixel with the median brightness value of the searched pixels; pixels
that differ significantly from adjacent pixels remain unaffected.
Adjustments
Use the Adjustments drop-down menu to apply color corrections to the image.