Scale a bunch of images at one time.

Todd Slater dontodd at
Sun Nov 26 20:39:10 UTC 2006

On 11/26/06, Kipton Moravec <kip at> wrote:
> I took a bunch of photographs of a vacation trip and want to make web
> pages with the pictures. Fortunately or unfortunately the camera took
> very high resolution pictures. Too high a resolution for a web page.
> Playing around with GIMP Image editor I found if I scale the pictures
> 25% in the horizontal and vertical, I get a pretty good picture for my
> web page. It is about 1/16 the original pixels, so it loads a lot
> quicker and is the right size for the page.
> Here is the problem. I have about 150 of these .jpg images in a
> directory that I want to scale the same way. I have been renaming them
> with an "s" appended to the original name (for small), but that is a
> "nice to have" and not necessary.
> Is there a way to scale all of of the pictures in one operation? How?
> With what tool? Where is the documentation?

Use ImageMagick, a command line tool. There are actually several
commands in the package, I prefer mogrify, but convert will work too.
See the --geometry option. A word of caution, IIRC mogrify replaces
the image, so be sure to copy the images to a new folder then do
something like

mogrify --geometry 800 *.jpg


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