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ImageQuant 400 User Manual
which is an area with large changes in intensity, the subtraction yields light-colored pixel
values. The larger the difference in intensities, the lighter the resultant pixels.
Note: After applying the horizontal edge filter the entire image may appear
black, and might require reducing the White level in order to better visualize the
results.
4.7.9 Vertical Edge Filter
This filter (Vert. Edge) brightens vertical edges using the approach described for the
horizontal edge filter (see above), except that the image is shifted horizontally before the
shifted image is subtracted from the original. In this case, the vertical edges produce
light-colored pixel values. As in the horizontal edge filter, it may be necessary to adjust
the White level in order to better visualize the results of this filtering process.
4.7.10 Custom Filter
This function also allows the user to customize filters. Using the weighting factors of the
other filters as a frame of reference, it’s possible to experiment with new weighting factor
values.
4.7.11 The UNDO Button
The upper right button is labeled UNDO. This reverses the last filtering process applied
to an image. To revert the image to its original state after multiple filters have been
applied, press the RESET button on the main interface.
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