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I would like to know how to resize images in Ubuntu. What is the easiest tool to do so?

14 Answers 14

187

You want simple?

Run sudo apt-get install nautilus-image-converter, or click nautilus-image-converter Install nautilus-image-converter.

It adds two context menu items in nautlius so you can right click and choose "Resize Image". (The other is "Rotate Image").

You can do a whole directory of images in one go if you like and you don't even have to open up an application to do so.

You need to restart your nautilus to see new context menus, run nautilus -q and then click the Home folder icon to reload nautilus with the new plug-in.

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    Does not work in Ubuntu 13.10 :( – malisokan Nov 11 '13 at 17:28
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    Works great in Fedora 20, too. sudo yum install nautilus-image-converter – Greg Sheremeta May 9 '14 at 19:05
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    It works on Ubuntu 14.04. Thanks. – Saeed Zarinfam Aug 22 '14 at 8:41
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    I think you need to log out or reboot after installing it--or just do what I did; run pkill nautilus and then click the Home folder icon to reload nautilus with the new plug-in. – Lambart Mar 31 '15 at 22:12
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    ...or just run nautilus -q as someone added to the answer since my last comment. :) – Lambart Dec 12 '16 at 18:54
284

First install ImageMagick via:

sudo apt-get install imagemagick

Open a terminal and run this command:

convert  -resize 50% source.png dest.jpg

It will reduce the size by 50%

You can also specify the size:

convert -resize 1024X768  source.png dest.jpg

You can also use: mogrify command-line tool from the same package.

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    first of all, to use convert -> sudo apt-get install imagemagick – javaloper Sep 28 '12 at 12:02
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    the command reduces the size to 50%, not by 50%. – Matthias Weiler Nov 15 '17 at 17:06
  • @MatthiasWeiler those are identical, not sure what you mean – Alexander Mills Jan 1 '18 at 0:08
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    They are only identical for the special case of 50%. -resize 10% makes your image 90% smaller. – Matthias Weiler Jan 10 '18 at 15:08
  • if you get an error "no images defined.." it is probably because you did not define destination image... e.g. in the above example, dest.jpg is a must :) – Ramesh Pareek Jan 11 '18 at 3:07
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sudo apt-get install imagemagick

The command mogrify overwrites the original files with the resized images:

mogrify -resize 50% *.png      # keep image aspect ratio
mogrify -resize 320x240 *.png  # keep image aspect ratio
mogrify -resize 320x240! *.png # don't keep image aspect ratio
mogrify -resize x240 *.png     # don't keep image aspect ratio
mogrify -resize 320x *.png     # don't keep image aspect ratio

Note: You can add -auto-orient to automatically orient converted images.

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  • Don't keep aspect ration with convert: convert hospital.jpg -resize 2000x! hospital_2000.jpg – Adobe Oct 5 '13 at 22:15
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    Perfect and simplest possible answer with both situations. love it ! – navderm May 14 '15 at 19:02
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    the initial images are replaced with the new resized ones. in case you need the initial ones, make a backup – user47206 Oct 26 '16 at 8:53
23

If you're just doing a couple of images, most image editors in Ubuntu (Gimp, F-Spot, etc) will let you do a basic resize.

If you want to edit tens, hundreds or thousands of images, I prefer Phatch. Phatch is a GUI-based batch photo editor that will let you perform a whole load of transformations on images. sudo apt-get install phatch

ImageMagick is good but it's a bit tedious if you don't know the setting names for things. You can very quickly learn Phatch by clicking around.

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  • F-Spot does resize? Where? – Martin Jul 23 '13 at 11:17
  • While installing phatch my Chrome Browser got closed and I was unable to relaunch it, I had to remove phatch and other packages it installed to get chrome back to working state. – mallaudin Apr 25 '17 at 19:12
16

ImageMagick is the package you want. It contains a number of useful command line tools for this very purpose.

Here's a simple tutorial explaining how to batch resize images:-

mogrify -resize 320x240 *.jpg

After this command is completed, all of the images will be replaced with resized version of themselves. Notice that in an effort to preserve the image aspect ratio, mogrify may not be produce images that are exactly 320x240. To force this to happen, modify the original command to by placing an exclamation point at the end of the desired resolution:

mogrify -resize 320x240! *.jpg
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13

No need to install any new software just do this

convert -resize 50% myfigure.png myfigure.jpg

or

convert myfigure.png -resize 200x100 myfigure.jpg
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    No new software - except for imagemagick, the package that contains convert. – Chris Jenks Dec 24 '19 at 18:29
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At the moment nautilus-image-converter does not work in Ubuntu 13.10. Therefore I use imagemagick on the command line, which is very good workaround (at least for me).

sudo apt-get install imagemagick

Keep in mind the difference between these imagemagick tools:

  • Mogrify does processing on the same image, it reads file modify file and writes the output to the same file.
  • Convert is meant to work on separate images, reads file and modify and write to different file/format. You can also use convert command to use output file same as input file.

I often use mogrify to simply resize multiple images and overwrite the original files. I. e. this command would scale down the dimension of all JPG files to 40% of the original dimension:

mogrify -verbose -resize '40%' *.JPG
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8

GIMP is probably the easiest way, since it has a fairly simple UI for such common tasks. All you have to do is open up your image and go to Image → Image Size and then change accordingly. There are ways to do batch resizing using the GIMP as well, but I don't know them by heart.

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8

Install gthumb. Simple and easy for basic image handling and editing functions - viewer, resizing, cropping, rotate, flip, grayscale, etc with options to save in JPEG, PNG, TIFF, TGA formats.

To install gthumb:

  • Open your terminal
  • Type sudo apt-get install gthumb
  • Accept the changes
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    On Linux Mint, it was optimal solution for me. – Fedir RYKHTIK Dec 18 '13 at 12:29
  • I am used to rotate my photos with gthumb. – Arpad Horvath Dec 28 '14 at 19:44
  • Please add the hint to your solution that you can set under gthumb->preferences->Viewer the zoom behaviour after (re)loading an image. Works great with svg files too. Reale saved my life when working with figures generated from matplotlib... – newandlost Sep 9 at 11:23
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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. It has plenty of actions and options as imagemagick.

sudo apt-get install phatch
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4

There is a good multiplatform tool called XnConvert. Combine and choose between more than 80 different operations. The installation is simple through deb. file from the official website.

It is free but not opensource, perhaps that's just the beauty of it.

enter image description here

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4

You can also use the ubiquitous ffmpeg (or avconv) tool to resize images:

ffmpeg -i image.jpg -s 4096x2048 image-resized.jpg

And if you want really fast JPEG image resizing - try epeg (as mentioned here and there) - which needs to be built from source.

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  • The quality is very good compared to convert and mogrify from ImageMagick. This is my favorite one. – fsevenm Sep 16 '19 at 10:02
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open the image in ImageMagick.

  1. click on the image command box will be open.
  2. view->resize enter the pixel you want. click on resize button.
  3. File-> save, enter the name. click on Format button choose the format you want and click select button.
  4. click on save button.

another option is select view -> original image and Drag the corners of the image to resize it. select File -> save.

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1

I use Pimagizer. It works great and it is the easiest application I have used. Tested on Ubuntu 14.04, 15.04, 15.10.

sudo add-apt-repository ppa:vfrico/stable
sudo apt-get update
sudo apt-get install pimagizer

See : https://launchpad.net/pimagizer/ for more infos.

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