This is a highly dedicated filter
for images that are shown on CRT monitor. Do not apply over original
image, publish a copy.
All CRT monitors have problem
with the slew-rate or signal stabization in the horizontal direction,
but not in the vertical direction. The Monitor
Signal Conditioning Graph on the above page shows this problem well
(this filter can be applied over that graph to see if it works, just
convert the gif to RGB mode and apply the filter).
The filter looks edges on each horizontal line and compensates it by
a special algorithm. It does what it does rather well, the only thing
that it can not compensate is a 0/255 edge since the signal is already
at min/max limits.
The effect is not large, but the filter does correct the CRT imperfection
to great extent, the image will appear more natural and "airy"
rather than "closed".
This filter works properly only when applied over linear images. It
should be applied over the final copy just before the output compensation.
First thing to do when the
filter opens is to Shift-Click the preview + button in order to have
the 1:1 zoom in the preview box. Then drag the image so that a
representative area is shown, the dragging is not limited to the preview
box boundaries.