2023

User Guide | 410
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.
Levels - To brighten highlights, compress shadows, and adjust midtones ●
individually.
Curves - To make precision tonal adjustments to lighten or darken a picture. ●
Instead of limiting adjustments to shadows, highlights, and midtones, you
can adjust any point along a scale of 0% to 100% (for CMYK and grayscale)
or 0 to 255 (for RGB). The precise nature of this tool requires more
experience and knowledge than using the Levels effect.
Brightness/Contrast - To adjust the tonality of every pixel instead of ●
individual channels. .