Legacy ImageMagick Discussions Archive

Hi fmw42!

Script with level:

infile="T_001.png"
inname=`convert $infile -format "%t" info:`
maxbin=`convert $infile -depth 8 -format "%c" histogram:info:- | sed 's/^[ ]*//' | tr -cs "0-9\n" " " | sort -g -r -k 1 | head -n 1 | cut -d" " -f2`
echo $maxbin
maxpct=`convert xc: -format "%[fx:$maxbin ...

I'm using ImageMagick 6.7.7-10 2014-03-06 Q16 on Ubuntu 14.04 LTS x64.

I already tried textcleaner.sh. Really nice script, but it's not what I want, because there is not only text. The result should be also greyscale, not black and white.

The best results without loosing to much information was ...

Hi fmw42!

Here is an example:
http://spies-online.org/T_001.png

HIstogram:
http://spies-online.org/histogram.gif

-auto-level seems to do nothing:
http://spies-online.org/T_001_auto-level.png

The result with -linear-stretch 0%x83%:
http://spies-online.org/T_001_linear-stretch.png

The ...

Hi!

I have thousends of scans of old documents (all greyscale, all of different grey backgrounds). I would like to use convert-stretch on each file individually.
I thought I could use the histogram to calculate the white-point I have to use.

Sample histogram "convert Test_001.png -define ...