ImageMagick convert scan: Difference between revisions
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= Text document resize and quality = | = Text document resize and quality = | ||
After scanning a document you may want to resize and compress the resulting image. You should scan with a higher resolution so you can have a better-quality lower resolution. | After scanning a document you may want to resize and compress the resulting image. You should scan with a higher resolution so you can have a better-quality lower resolution. | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
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= Text document white threshold = | = Text document white threshold = | ||
The white paper background will probably not end up being white so we add a 'white-threshold'. A lower value will mean more light areas are converted to pure white. | The white paper background will probably not end up being white so we add a 'white-threshold'. A lower value will mean more light areas are converted to pure white. | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
convert "${file}" -white-threshold | convert "${file}" -white-threshold 85% -resize 1500x -quality 80 "${tofile}" | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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= Also see = | = Also see = | ||
* [[ImageMagick tools]] | * [[ImageMagick tools]] | ||
Latest revision as of 18:11, 29 April 2017
Compress, using quality
#!/bin/bash
mkdir new
for file in *.jpg
do
nameext="${file##*/}"
name="${nameext%.*}"
ext="${nameext##*.}"
tofile="./new/${name}.${ext}"
echo "${file} --> ${tofile}"
convert "${file}" -white-threshold 92% -resize 1500x -quality 80 "${tofile}"
done
echo "Press ENTER to continue .."
read
Text document resize and quality
After scanning a document you may want to resize and compress the resulting image. You should scan with a higher resolution so you can have a better-quality lower resolution.
convert "${file}" -resize 1500x -quality 85 "${tofile}"
Text document white threshold
The white paper background will probably not end up being white so we add a 'white-threshold'. A lower value will mean more light areas are converted to pure white.
convert "${file}" -white-threshold 85% -resize 1500x -quality 80 "${tofile}"
Split up picture
When you scan all your old photos, four at a time, you can use this to divide them up in quarters.
convert "${file}" -crop 2x2+4+4@ +repage +adjoin "${tofile}"
