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I want to scale all images in a given folder to the same width (but different appropriately scaled heights). How can I do this using a GUI-based or command-line tool?

For bonus points, is it possible to restrict which images are scaled based on their initial width (that is, only scale images that have a width > x and/or a width < y)?

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avconv can do this via the CLI - See: libav.org/avconv.html#scale-1 –  Elder Geek Jun 4 at 18:04

5 Answers 5

up vote 52 down vote accepted

This is very easy to do with imagemagick. You should be able to install it in the Software Center. I would suggest it for batch processing of images.

The batch resizing is incredibly simple (I tested it with Ubuntu 11.10). Use the following command to resize every .jpg file to 200 pixel width, keeping the aspect ratio:

$ convert '*.jpg[200x]' resized%03d.png

This is only scratching the surface of the power of imagemagick. Resizing can be tuned endlessly. For more advanced resizing you have to use the -resize option.

You can limit the resizing to shrinking:

$ convert '*.jpg[300x>]' thumb-300-%03d.png

or enlarging:

$ convert '*.jpg[300x<]' thumb-300-%03d.png

Have look at the geometry documentation to see more options.

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For GUI, Phatch "one click is worth thousand photos" is the best for such quick job. It is already in Ubuntu repository.

sudo apt-get install phatch
  1. Add Scale & Save item
  2. Set scale/resize options
  3. Set save/output options
  4. Run
  5. Set input folder
  6. Click batch to execute

enter image description here enter image description here

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1  
For an upvote, an example how to actually accomplish the task in the question would be nice :) But thanks for the tip, nice tool! –  jaywink Jul 28 '14 at 7:12
    
great tool for quick actions, thanks –  Angel M. Jan 3 at 8:48

Try this:

sudo apt-get install gimp-plugin-registry

Then, open up Gimp and open the Batch plugin found in Filters > Batch > Batch Process.

Select your images in the Input tab, and define the Resize operation in the surprisingly-named Resize tab.

More information can be found here.

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Answered and accepted (and I use ImageMagick) but for completeness... I have a non-technical boss that wanted a simple viewer with some basic tools and it had to be GUI. I decided on gThumb for him. In the thumbnail view you...

Select any images you want resized
Start the resize function
Put in a new size based on pixels or percentage
Select an output folder, and off you go.

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For batch image resizing I’ve looked at many packages and finally found one with a usable interface – converseen. Once you discover that the important settings are somewhat hidden on the scrollable left pane, all is well.
Not sure if this meets all of the OPs use cases, but you may not have to look at the quirky UIs of imagemagick or phatch.
Oddly, photo management packages like digikam, f-spot, fotoxx or shotwell don't seem to recognize the need for copying/resizing batches of images before uploading to online services like photobucket or (gag) flickr. These services want us to do things their way only so I do not trust them for backing up originals.

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