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Canvas 12 User Guide
To calculate resolution:
If only one object is selected, you can calculate an appropriate resolution based on a halftone screen
frequency.
1. Click Auto in the Image Resolution dialog box.
2. Enter the screen frequency and choose Draft, Good, or Best. Canvas calculates the resolution
by multiplying the screen frequency by 1 (draft), 1.5 (good), or 2 (best).
3. Click OK to enter the calculated resolution in the Image Resolution dialog box.
Resampling and sharpening images
Resizing and resampling causes images to appear softer. However, you can apply the Unsharp Mask
filter to bring soft images back into focus. For more information, see "To apply the Unsharp Mask
filter:" on page 480.
To specify how Canvas approximates new pixels:
When increasing image resolution, Canvas uses one of two methods to calculate color values for the
pixels it adds to an image. To change the method, use the Interpolation control in the Configuration
Center.
1. Choose File | Configuration Center. Select the Painting manager in the General settings.
2. Select an option under Interpolation and click OK. For more information, see "Setting
preferences" on page 97.
Auto-tracing images
You can use the Auto Trace command to create vector objects from an image. The Auto Trace
command traces an entire image or any channel of an image and is available when a paint object is
selected. Auto-tracing is much faster than tracing an image by hand with the Polygon or Curve tool,
although you might need to edit the resulting vector paths. When Canvas performs an auto-trace, the
original image is not changed. When the tracing is complete, you can move the vector objects away
from the image.
Canvas auto-traces high-resolution images better than low-resolution images. Auto-tracing
an image with a resolution lower than 300 ppi can produce jagged paths.
Canvas traces an image with curves or straight path segments. Auto-tracing usually produces
several paths that follow various sections of the image. After tracing, group and edit the resulting
paths.
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