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You need to install imagemagick.
On Debian type:
# apt-get install imagemagick
Simple command to convert a large number of images into jpeg-format. Will delete originals after conversion.
To resize photos without changing exif datas, pretty cool for gps tagging.
(Require ImageMagick)
-geometry (preserves values of height and width given, and aspect ratio).
WARNING: While 'resize' creates resized copies of original files, 'mogrify' works on the original files, replacing them. It will overwrite the source files, use with caution, and backup regularly.
mogrify can be used like convert. The difference is that mogrify overwrites files:
http://www.imagemagick.org/www/mogrify.html
Of course, other source colors can be used as well.
This command requires the imagemagick libraries and will resize all files with the .jpg extension to a width of 1024 pixels and will keep the same proportions as the original image.
Resizes all images in the curent directory to x resolution.
It is better than `mogrify -resize *.jpg` because of independence from extension of image (e.g. .jpg and .JPG) (:
- Backup data before reszie as it over write original
-To preserve aspect ratio remove !
optipng *.png
http://www.mobileread.com/forums/showpost.php?p=147076&postcount=7
-dither FloydSteinberg produces a more uniform dither than the default.
Imagemagick library is used. If image format is not JPEG, the "quality" option should not be issued.