That’s funny you asked this, I just did this recently for my work’s site and I was thinking I should write a tutorial… Here is how to do it with PHP/Imagick, which uses ImageMagick: $usmap = ‘/path/to/blank/us-map.svg’; $im = new Imagick(); $svg = file_get_contents($usmap); /*loop to color each state as needed, something like*/ $idColorArray = … Read more
ImageMagick ships with the montage utility. Montage will append each image side-by-side allowing you to adjust spacing between each image (-geometry), and the general layout (-tile). montage [0-4].png -tile 5×1 -geometry +0+0 out.png Other examples can be found on Montage Usage page
Install the packages imagemagick and libmagickwand-dev (or libmagick9-dev). You should then be able to install the Rmagick Gem. sudo apt-get install imagemagick libmagickwand-dev If not, you are missing ruby related development packages like build-essential and ruby1.8-dev. If that’s the case, a generic “ubuntu install ruby 1.8” query in google should sort you out.
I am using ImageMagick 6.6.9-7 on Ubuntu 12.04. What worked for me was the following: convert test.png -transparent white transparent.png That changed all the white in the test.png to transparent.
exiftool does the job for me, it’s written in perl so should work for you on any o/s https://exiftool.org/ usage : exiftool -all= image.jpg UPDATED – as PeterCo explains below this will remove ALL of the tags. if you just want to remove the EXIF tags then you should use exiftool -EXIF= image.jpg
To solve the issue in Mac OSX Sierra, High Sierra, El Capitan, Mojave, Catalina, Big Sur, and Monterey (M1 chip), you can do the following: brew unlink imagemagick brew install imagemagick@6 && brew link imagemagick@6 –force imagemagick@6 is keg-only, so you’ll need to force linking.
My own favorites are these two: compare image1 image2 -compose src diff.png compare image1 image2 -compose src diff.pdf The only difference between the 2 commands above: the first one shows the visual difference between the two images as a PNG file, the second one as a PDF. The resulting diff file displays all pixels which … Read more
When building native Ruby gems, sometimes you’ll get an error containing “ruby extconf.rb”. This is often caused by missing development libraries for the gem you’re installing, or even Ruby itself. Do you have apt installed on your machine? If not, I’d recommend installing it, because it’s a quick and easy way to get a lot … Read more
I use always: quality in 85 progressive (comprobed compression) a very tiny gausssian blur to optimize the size (0.05 or 0.5 of radius) depends on the quality and size of the picture, this notably optimizes the size of the jpeg. Strip any comment or EXIF metadata in imagemagick should be convert -strip -interlace Plane -gaussian-blur … Read more
Note: the solution in this and other answers involves disabling safety measures that are there to fix arbitrary code execution vulnerabilities. See for instance this ghostscript-related and this ubuntu-related announcement. Only go forward with these solutions if the input to convert comes from a trusted source. I use ImageMagick in php (v.7.1) to slice PDF … Read more