On Tue, 24 Jul 2007 12:44:50 +1000, Anthony Thyssen wrote:
> Try using ...
Thanks Anthony for your reply. I re-formulate the OP into the following new
question:
How to correctly produce the sketch effect with pictures that have
transparent backgrounds, I.e., those pictures whose backgrounds have been
cleared using gimp?
This is what I need to do[1]:
. Duplicate the picture into 2 layers.
. Gaussian Blur the top layer with a radius of 7 pixels.
. Invert it (the top layer), and set its opacity to 50%.
. Merge the two layers.
The last two steps will effectively subtract the top layer from the original
layer to obtain a high pass filtered version of the original picture.
This is what I've tried:
convert pic1.png \( +clone -median 2 -blur 0x7 -negate \) \
-matte -channel A -evaluate set 50% -compose plus -composite pic11.gif
and
convert pic1.png \( +clone -median 2 -blur 0x7 -negate \) \
-matte -channel A -evaluate divide 2 -compose plus -composite pic12.gif
First of all, please take a close look for me if the commands are in fact
that what I planned to do. Now here are the problems:
For the 1st command, the cleared background shows up again in the result.
As an attempt to fix it, I tried the 2nd one, but this time the cleared
background shows up in bright colors, as opposed to the rest of images
which have the dull high pass filtered effect.
Please get the original picture from
http://xpt.sourceforge.net/download/pic1.png
and test for yourself, and see if you can find a way to make it work.
thanks!
[1] http://www.gimp.org/tutorials/Sketch_Effect/
--
Tong (remove underscore(s) to reply)
http://xpt.sourceforge.net/techdocs/
http://xpt.sourceforge.net/tools/
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