2017

• Despeckle - Detects the edges in a picture and blurs all of the picture except those
edges. It removes noise while preserving detail, and can be useful for removing
dust from a scanned image.
• Gaussian Blur - Smoothes transitions by averaging pixels next to hard edges of
defined lines and shaded areas in a picture. By checking Blur Picture and/or Blur
Mask, you can apply this filter separately to pictures and their alpha masks..
• Unsharp Mask - Compares pixel values in a defined area to the specified threshold
value. If a pixel has a lower contrast value than the threshold value, its contrast
is increased.
• Find Edges - Outlines the edges of a picture with dark lines against a white
background.
• Solarize - Blends negative and positive areas of a picture, producing a photographic
solarization effect. To use the Solarize dialog box, enter a 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.
268 | A GUIDE TO QUARKXPRESS 2017
PICTURES