Sending again as my email font got messed up in the prevous message.
Fred
Claus,
I can see two problems right away. I will have to look into your
script in more detail regarding the unsharp masking and the use of
-mask, -edge and -usharp. However there are the several errors that I
see right away.
1) You need to define your tmp files and setup to have them
auto-deleted after completion (you can use .png or .miff or whatever
format you want. For example, as Anthony showed me...
# set directory for temporary files
dir="." # suggestions are dir="." or dir="/tmp"
tmp0="$dir/unsharp_0_$$.png"
tmp1="$dir/unsharp_1_$$.png"
tmp2="$dir/unsharp_2_$$.png"
tmp1p="$dir/unsharp_1_$$.png"
tmp2p="$dir/unsharp_2_$$.png"
trap "rm -f $tmp0 $tmp1 $tmp2 $tmp3 $tmp1p $tmp2p; exit 0" 0
trap "rm -f $tmp0 $tmp1 $tmp2 $tmp3 $tmp1p $tmp2p; exit 1" 1 2 3 15
2) Your conversion to HSL should be
convert $1 -colorspace HSL -channel R -separate $tmp0
convert $1 -colorspace HSL -channel G -separate $tmp1
convert $1 -colorspace HSL -channel B -separate $tmp2
as you have it all three $tmp file are the HUE channel. In mine
above, tmp0 is the hue, tmp1 is the saturation and tmp2 is the
lightness.
3) In your steps
convert -mask $tmp2
convert $tmp2 -edge 2.5
convert $tmp2 -unsharp 2.0
The first has no input and the second and third have no output
4) Your output $1.tiff will take the input, for example image.jpg and
make the output image.jpg.tiff. I am not sure that you want that. You
may want to strip off the suffix on the input and then add the new
suffix to create the output. For example.
inname=`echo "$1" | sed -n 's/^\([^.]*\)[.][^.]*$/\1/ p'`
outfile=$inname.tiff
use $outfile where you have $1.tiff
Hope this helps.
Fred
__________________________
Hi all,
here's the first draft of a shell script I wrote, which is supposed
to be an advanced 'Unsharp Mask' technique (thanks to Anthony
for his suggestions).
The only problem is that the script, as it is now, results in error
messages right at the beginning ('No command convert' or to
the effect). This is most likely a syntax error on my part.
What this script is supposed to do, is:
1. Convert an RGB image into 'HSL'.
2. Copy the 'L' Channel into a mask.
3. Apply an edge detection to it.
4. Apply a Gaussian Blur to it .
5. Make a selection out of the mask (don't know
if this is necessary in IM; I would proceed like this
in a bitmap editor).
6. Select all the channels ('H','S', and 'L', and apply
the final 'Unsharp Mask' filter to them.
7. Convert the image back to RGB.
My script:
--- begin ---
#!/bin/sh
PATH=/home/ccyrny/Grafik/scripts; export PATH
convert $1 -colorspace HSL -channel R -separate $tmp0
convert $1 -colorspace HSL -channel R -separate $tmp1
convert $1 -colorspace HSL -channel R -separate $tmp2
convert -mask $tmp2
convert $tmp2 -edge 2.5
convert $tmp2 -unsharp 2.0
convert $tmp0 - colorspace $colormodel $tmp0 -compose CopyRed -composite \
$tmp1p -compose CopyGreen -composite \
$tmp2p -compose CopyGreen -composite \
-colorspace RGB $1.tiff
convert +mask
--- end ---
Can anyone see what mistakes I made here?
TIA,
Claus
P.S.: After taking a look at the script again, I see that
at least the two steps right after 'convert -mask $tmp2'
are not correct, because I don't want to work with the
'L' channel ($tmp2) as it is, but with the mask I (hopefully)
created out of $tmp2.
Fred: This is the script you wanted to know about!
--
Home Page - http://home.arcor.de/ccyrny/ [in English]
graf-o-matic 2.0 - http://grafomatic01.twoday.net/ [in German]
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