1/4/2024 0 Comments ImagemagickTo install, use the sudo command with dnf: sudo dnf install ImageMagick parallelīefore you start running the commands below, be aware the mogrify command overwrites the original image file. These packages are available in the Fedora repositories. The mogrify command is part of this suite. You can use it to resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. It can deal with lots of popular formats, such as JPEG, PNG, GIF, and more. The ImageMagick suite of tools offers many ways to change or manipulate images. If you write loops in the shell, you’ll find parallel can often replace most of the loops and finish the work faster, by running several jobs in parallel. It’s written to have the same options as xargs. If you use xargs or tee, you’ll find parallel easy to use. The GNU Parallel program can be used to execute jobs faster. How can you do this without reinventing the wheel? The answer is simple: use GNU Parallel and the ImageMagick utility suite. With that in mind, you want to modify your task to work in parallel. Everything is going fine, until you realize this process will take more time than expected.Īfter rethinking the process, you realize this task is taking so long because the serial method processes one image at a time. ![]() You might write a simple script or batch process to handle the conversion automatically with ImageMagick. The “basename” strips the suffix.Imagine you need to make changes to thousands or millions of images. To reduce png file's size when reducing color, use -depth for values of ” to stand for file name. Note that reducing colors does not necessarily reduce file size. To reduce color without dithering, use +dither instead of -dither. Reduce color convert -dither -colors 256 old.png new.png That makes it 8 bits.įor clean black and white line art, you can use “-depth 2”. In particular, for a grayscale line art in png, you can do:Ĭonvert -depth 8 old.png new.png. Note: this does not force the png image format to use indexed color for smaller file size. ![]() Transparency, Color, Bits Per Pixel remove transparency/alpha with white convert -flatten old.png new.png to gray scale convert -type Grayscale old.png new.png The above increase color saturation by the multiplier 130%. saturation convert -modulate 100,130,100 old.png new.png The 3 numbers means: brightness, saturation, hue. The above increase brightness by the multiplier 150%. Color, Brightness, Saturation… brightness convert -modulate 150,100,100 old.png new.png To crop by specifying percentage of sides to cut, use “-shave”. The x and y axes's origin starts at the upper left corner. The 0 is the offset on x-axis, and 56 is the offset of y-axis. The 853 and 368 would be the new image's width and height. Scale, Crop scale convert -scale 50% old.gif new.png autocrop convert -trim cat.png cat.png crop convert -crop 853x368+0+56 old.png new.png ![]() Each time you save to JPG, it loses some info. ForĮxample, converting from png to gif may loseĬolors because gif only support a max of 256 colors. The format you are converting from, otherwise you may lose info. Remember, the destination format should support all the features of Jpg png Conversion gif to png convert p1.gif p2.png png to jpg convert -scale 50% -quality 80% old.png new.jpg On Microsoft Windows, the command name for GraphicsMagick is gm.exe, For example gm.exe convert f1.png f2.jpg.ImageMagick is usually installed at C:\Program Files\ImageMagick-7.0.10-Q16-HDRI.For example, instead of convert …, write magick convert … If you are using Version 7 (released on 2011-08) or later, you should prefix magick in front of commands on examples given on this page. ![]() If you are using GraphicsMagick, just add gm in front of the command. The following shows ImageMagick commands. This page shows you how to do common image editing tasks using the command line software
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