Creating a "windowshot" instead of a screenshot

[Rich]

This is a modified version of screenshot.sh that will produce a png of the window you click on. It depends on xwininfo
to run so you need to install xorg-7.(5 or 6)-bin.tcz only.

[Rich]

I forgot to mention, if you click on the desktop, it will create a screenshot.

[tinypoodle]

Excellent!

One observation: the aterm from which command is executed must not overlap the window clicked on, or it would end up being included in the windowshot.

[Rich]

Hi tinypoodle
That is correct. The "picture" will be of whatever is visible on the screen inside the coordinates of that particular
window.

[tinypoodle]

Not being Rich but just assuming you were replying to my post...

Also, I found that areas of windows outside screen borders will be painted gray.

[beroje]

very good
Two windows, one superimposed on the other.
Clicking on the rear window also captures the front.

Muy bueno
Dos ventanas, una superpuesta a la otra.
Al hacer clic en la ventana posterior tambien se captura la frontal.

[Rich]

Hi tinypoodle

Not being Rich but just assuming you were replying to my post...

Lack of sleep, copied/pasted the wrong name, corrected.

That's because  imlib2_grab  can only save what is painted on the screen, but since it uses the windows coordinates
and dimensions, it fills in what it can't read in gray. In fact, I once read through some of the documentaion for
imlib2_grab  and I seem to recall it was mention there too.

[Rich]

Hi beroje
Glad you like it.

[tinypoodle]

That makes all sense and still an advantage over having a full screenshot when only a window is required.
I'd assume the gray areas should be well compressible by png.

[Rich]

Hi tinypoodle

I'd assume the gray areas should be well compressible by png.

Not as much as you might think. I took the same shot as the one attached to my first post but with the window
halfway off the screen and the file size went from ~16K to ~15K. On my system the off screen section was black.

[tinypoodle]

The semantic difference between "assume" and "test"...

And probably black is preferable over gray as look.

[tinypoodle]

Hmm, I got 68Kb with an estimated quarter of window visible versus 171Kb with same full window, so I guess it may depend.

[Rich]

Hi tinypoodle
The results I got may be do to the fact that I used the editor with just the posted script in it. I slid the window to the
right obscuring the right half of the window which consisted of a lot of white space and may have already compressed
fairly well when doing a capture.

[tinypoodle]

Such factors most likely could explain the differences.

[hiro]

Elegant. I'm using it as my default from now on, but I removed the sleep.