And of course, larger image size too as compared to high compression levels. └ Note: Lower compression level means better quality of image. To change the quality index (compression level) of a JPEG image, use: convert test.jpg -quality 15 test_2.jpg To change contrast level of an image, use : convert -brightness-contrast x5 test.png test_2.png To change image brightness, use: convert -brightness-contrast 10 test.png test_2.png convert test.png test.jpg Change Image Brightness and ContrastĬonvert can be used to modify attributes such as brightness, contrast, compression level, etc. It supports huge number of formats.īelow is an example command to convert a PNG image to JPG format. The convert tool can convert images from one image format to the other. # This keeps the width but changes height to 200 Convert Image Format # This keeps the height but changes width to 300 # 300 is the width to be converted to in pixels, and 200 is the height in pixels # Here test.png is the source image, test_2.png is the name for converted image To resize an image, we use the flag -resize: convert test.png -resize 300x200 test_2.png #Linux command line convert image format installTo install on CentOS and Fedora, run: yum install ImageMagick Resize an Image using Convert └ Note: For older Ubuntu versions (version 14.04 and below), you need to use apt-get instead of apt. If it is not installed, we can install it on Ubuntu and Debian with: sudo apt install imagemagick Installing ImageMagick ( convert)įirst verify if ImageMagick is already installed using: convert -version It consists of many tools with number of options for image modification, conversion, etc. ImageMagick is a suite of image modification software for Linux.
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