calculate pixel number linux imagemagick convert

Xinerama-based multi-head setups have only one virtual screen. $ convert +append /tmp/0.png /tmp/1.png screenshot.png $ import -window root -display :0.1 -screen /tmp/1.png $ import -window root -display :0.0 -screen /tmp/0.png If you run twinview or dualhead, simply take the screenshot twice and use imagemagick to paste them together:

Note: If you prefer graphicsmagick alternative, just prepend 'gm', e.g. With -pause you can specify a delay in which you can, for example, lower some windows. Running import without the -window option allows selecting a window or an arbitrary region interactively.

Is harder to use when the correlation between quality and storage size is not clear.Īn easy way to take a screenshot of your current system is using the import(1) command:

$ convert image.jpg -quality 85% image_small.jpg Hopefully, this will shorten the transmission time. $ convert image.jpg -define jpeg:extent=3000KB image_small.jpg To achieve reasonable quality for a given storage size: $ magick frame_red.gif -gravity South -chop 0x10 chop_bottom.gif Which is easier as less numbers, or trial and error, is involved. One can also -chop to cut of a single edge from an image, using gravity to select that edge. Where WIDTH and HEIGHT is the cropped output image size, and X and Y is the offset from the input image size. $ mogrify -crop WIDTHx HEIGHT+ X+ Y -format jpg *.png To crop part of multiple images and convert them to another format: $ convert -append input.pngs output.png Crop, chop

The basic usage of this facility is to specify the existing, and desired, image formats as the filename extension. Opposite operations can be performed by using a plus instead of a minus. Note: The sign before an option is important.

Calculate pixel number linux imagemagick convert