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linuxbashimagemagickimagemagick-convert

Imagemagick - combining 'crop' and 'add layer' arguments

I have two commands that work fine:

convert Nord.png -gravity South -crop x80% -fuzz 50% -fill '#5BC236' -opaque '#8FBCBB' -background transparent -extent 800x800 out.png
convert Nord.png out.png -gravity Center -composite -background '#2E3440' -gravity Center -extent 3840x2160 background.png

What they do is that they take a PNG file like this:

enter image description here

And convert it to an image like this:

enter image description here

But in the process, a file like this is created:

enter image description here

I'm wondering if it's possible to combine these two commands, so that a) there's only one call to the convert command, and b) only one file is created as the output.

I tried this command,

convert Nord.png -gravity South -crop x80% -fuzz 50% -fill '#5BC236' -opaque '#8FBCBB' -background transparent -extent 800x800 out.png -gravity Center -composite -background '#2E3440' -gravity Center -extent 3840x2160 background.png

But the output is different:

enter image description here

How can I combine these two commands into one?

Solution

  • You should be able to do some "aside-processing" in parentheses to clone the Nord.png image and make the crop and colour changes then when you exit the parentheses you will still have the Nord.png you started off with and the cloned, recoloured, resized image in the image stack which is how your second command starts anyway:

    convert Nord.png \
    \( +clone -gravity South -crop x80% -fuzz 50% -fill '#5BC236' -opaque '#8FBCBB' -background transparent -extent 800x800 \) \
    -gravity Center -composite -background '#2E3440' -extent 3840x2160 background.png

    The -gravity Center is a setting that gets remembered till you change it so there is no need to repeat it.