How To - Mass Resize Images

[lwfitz]

While creating a gallery on a website I had to find a way to mass resize my images to create thumbnails and this is what I came up with.

First, if you dont have imagemagick installed then you will need to run

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sudo apt-get install imagemagick

First we need to create a directory for our thumbnails

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mkdir ~/thumbs

Then create a copy of the images we want to resize and place them in ~/thumbs

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cp ~/gallery_images/* ~/gallery_images/thumbs/

Then cd to our thumbs folder

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cd ~/thumbs

Now we can resize all the images in our thumbs folder using the mogrify command
As far as I know this will work with all image types (png, gif, jpg, jpeg... etc)

This will keep the aspect ratio

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mogrify -resize 250 *.jpg

If you want to force resizing without maintaining the aspect ratio you can run
the command using a specific size such as

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mogrify -resize 640×480! *.jpg

Thats it. Hope this helps someone.

[VastOne]

Very nice How To lwfitz, useful!

imagemagick is a stock install on VSIDO and/or it can be pulled in from vsido-welcome

[lwfitz]

Thanks!

Yeah I know its stock on VSIDO but Im hoping someone else (not using VSIDO) may read it someday 

[VastOne]

^ Good idea...

Thanks lwfitz!

[Digit]

good tip there.

also may want to check out the

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convert command from imagemagick too.

would be nice if one day we have so many imagemagick tips here that we end up needing a whole forum section dedicated to it.   ... a guy can dream.