Screenshot of non active window

Question

How to take a screen shot of non active window? If I have 2 windows, I want to capture the screenshot of the one which is running in the background.

Solution 1

for i in `xprop -root|grep "_NET_CLIENT_LIST_STACKING(WINDOW): window id" |tr '#' ','|tr ',' '\n'| grep 0x`;do xwininfo -id $i|grep "Window id" ;done

Using the above I was able to get the windows id. and using

xwininfo

Solution 2

To elaborate a bit on previous answers and comments, the ability to capture a screenshot of a non active window (as in fully or partially hidden) seems to depend on the window manager.

Using the following (already given) command :

import -window <windowid> image.png

or

xwd -id <windowid> | convert xwd:- image.png

(the - of convert is for using standard input from the pipe, xwd: tells the format of the input) one seems to be able under Enlightenment (e17, tested with Fedora 19) to capture a screenshot of :

• fully or partially hidden windows ;
• minimized windows ;
• windows on other workspaces.

I checked with Openbox (same configuration) and KDE (with an old Scientific Linux 4.8 and latest version of ImageMagick (yes, incredibly it compiled…)) and in both cases screenshots show only what is on top of the display layers — that is, only what is already visible on screen.

The point is that the import command checks for the map_state field returned by XGetWindowAttributes to be IsViewable, and if not it returns an error. One can check map_state e.g. using :

xwininfo -id <windowid> | grep 'Map State'

It seems to be always IsViewable under e17, while it's IsUnMapped under openbox and KDE as soon as the window is minimized or whatever.

Not sure though why the screenshot is always clean with e17 while it's mixed with other windows when the window is partially recovered with other WMs, but obviously it also has to do with the way the WM handles the display.

Anyway, clearly it's a matter of WM. It would be nice to have a list of WMs able vs unable to do screenshots of hidden windows — I'm not doing it.

Solution 3

What do you mean by "non active"? "Not having the focus" or "hidden by some other window"? In the first case, gimp will do it without any problems (File -> Create -> Screenshot). In the second case, it's more difficult (if it's possible at all).

Comments

[phunehehe]

Interesting, I'm not sure if that's possible.

[Admin]

I think you should improve your question by making clear what is meant by "non active". Is this window, presumably not the one in focus, totally visible or partly visible or not visible at all because the active window covers part or all of it?

[spendyala]

Yes, non active means not having the focus. We can take screenshot of focused one. Can we make the window which is not having focus to be focused using command line. If so how can be do that.

[spendyala]

I want to do in commandline, to automate the process.

[Uwe]

I just checked that import (from the ImageMagick suite) has a -window id option. If you know the window identifier that should work, even on the command line. You can get the window identifier using xwininfo, but for that you'll have to use the mouse at least once.

[spendyala]

Can I extract for fixed height and width using import along with window id. I am also checking that.

[spendyala]

import -window <window_ID> screenshot.png

[spendyala]

This is the last step to automate the process. This is an interesting one for me.

[erik]

Interesting to know: You get the window id if you do xwininfo | grep -i 'window id' and click on the window in question.

[AnonymousLurker]

does not work if the window is fully invisible (in another workspace, not the active one)

[Stefan Reich]

For me, both commands work fine... unless the window is minimized (I'm using Peppermint Linux).

[Kusalananda]

This does not actually answer the question. It gets the window's ID, name and/or title, but it never takes a screenshot.

[ajgringo619]

Can you explain in more detail why this is a solution?

[thess]

With it kwin dont call "hideinternal" and flag map_state always IsVieable for minimized windows etc github.com/KDE/kwin/blob/…