However, if you still want to install from source, choose a platform, Linux or Windows. You also have the option of installing a pre-compiled binary release. If the identify program executes and identifies itself as ImageMagick, you may not need to install ImageMagick from source unless you want to add support for additional image formats or upgrade to a newer version. In either case, you can type the following to find out: magick identify -version ImageMagick website for an extensive list of options, examples and showcase.Chances are, ImageMagick is already installed on your computer if you are using some flavor of Linux, and its likely not installed if you are using some form of Windows.However, an example for false positives are images created with the Diamond-square algorithm. If it exceeds a certain threshold, the data could be considered random and a possible candidate for encryption. In general, testing if a raster image was encrypted can be done by checking the distribution of the pixel components. However, it could be removed or spoofed by an EXIF editing program. Metadata of image formats that have the cipher tag can be used to test for encryption. It is highly advised to read the discussion at Encrypting Images for all sorts of issues, and suggestions, for such commands. $ echo pass_phrase | magick image.png -decipher - image.jpg $ echo pass_phrase | magick image.jpg -encipher -depth 8 png24: image.png zathura) appear blank, try appending -frame or removing -f from the xdotool command. Note: If screenshots of some programs (e.g. $ import -window "$(xdotool getwindowfocus -f)" /tmp/$(date +%F_%H%M%S_%N).png Import -window "$activeWinId" /tmp/$(date +%F_%H%M%S_%N).pngĪlternatively, the following should work regardless of EWMH support: To avoid overwriting previous screenshots, the current date is used as the filename.ĪctiveWinLine=$(xprop -root | grep "_NET_ACTIVE_WINDOW(WINDOW)") It works with EWMH/NetWM compatible X Window Managers. The following script takes a screenshot of the currently focused window. Import -window root -crop $x$h+$x+$y head_$i.png Xdpyinfo -ext XINERAMA | sed '/^ head #/!d s///' | As long as Xinerama information is available from the X server, the following will work: In this case, you may want to take screenshot of each physical screen individually. If the physical screens are different in height, you will find dead space in the screenshot. 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.
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