ImageMagick is really cool. I've been enjoying it since, toying with images to and fro. Info from reads:

ImageMagick┬« is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and B├ęzier curves.

Install ImageMagick:

command:apt-get install imagemagick

example: reduce all images by 40%:
"cd" to the directory where all the images are and use this command to reduce all images by 40%:

command: mogrify -resize 40% *.*

the above assumes all are image files.

example: resize to a specific size:
mogrify -resize 1024X800 *.*
mogrify -resize 1024x800 -format jpg *

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