$ identify c_im.jpgĬ_im.jpg JPEG 400x267 400x267+0+0 8-bit sRGB 86.6KBĮven if I reduce the quality or the size further, I cannot get a file as small as what GIMP produces, unless I go so far that the image degenerates beyond recognition.Īnd even if I tick the EXIF and thumbnail boxes in GIMP, the size only grows up to about 43kB. I get a much larger file, without significant improvements in quality. If I resize it with Imagemagick's convert, however, as follows $ convert 100.jpg -quality 50% -resize 400x267 c_im.jpg Gimp doesnt have built in batch resizing functionality, but its pretty simple to add it via a plug-in called DBP (Davids Batch. I get a 20kB file of very acceptable quality. If I resize them with GIMP and export with these settings The images have the following characteristics. There are hundreds, so I'd like to use CLI tools. The script is just an example, and isn't set up to handle file names with spaces, but it shows you how easy it can be to batch things with ImageMagick.I have a batch of images I want to compress. To use it, open Terminal and cd into the folder where the images are that you want to scale, and run: scaleimages.sh

Save the file as something like, 'scaleimages.sh' in your home directory's ~/bin folder-you may have to create the folder-so it will be in your PATH, and make it executable: chmod 700 ~/bin/scaleimages.sh

Mogrify -resize '$>' -strip -interlace Plane -sampling-factor 4:2:0 -quality 85% $fname I often use the image batch processing plugin when I need to compress and resize lots of images. If you want to resize multiple images, compress images or change image file formats, then using the BIMP plugin for GIMP can save you lots of time. Here's a simple Bash script using Imagemagick's mogrify command that will prompt you for the width and height of JPG images you want to scale in the current directory, strip the EXIF data, set the interlacing, sampling factor, and quality to prepare the images for the web: #!/bin/bash In this video tutorial, I will show you how to batch process images using GIMP 2.0. It's very powerful, which may be why it appears confusing at first. I've been using Imagemagick for batch processing images in Ubuntu for years, and I don't have a single complaint.

Gimp batch compress images