Re: [Visualpython-users] Why no screenshot function?

[Stanley S. <ove...@ea...>]

Bruce is correct that there are screenshot functions in the operating
systems, including LInux.   In Ubuntu Linux and probably most distributions,
there's a widget that can be added to the desktop panel for taking a
screenshot.   On Windows, I use the Shift-PrintScrn key combination, then
open the accessory program called Paint and paste (Ctrl-V) the clipboard
onto the canvas.   Using Paint you can crop and make other changes, then
save as jpeg or other formats.  I've used this to make step-by-step
instruction manuals for using software, with a screenshot of each important
step.

Another useful program is the ImageMagick library, which is available for
many programming languages, including Python:
http://www.imagemagick.org/script/index.php.   It can do lots of image
conversions.

Stan

------------------------------------
On Sun, Oct 18, 2009 at 8:00 AM, Bruce Sherwood <Bru...@nc...>wrote:

> That could be useful; perhaps the reason it's not there is that there
> hasn't
> been much need expressed for such a facility. Note that on Windows and Mac
> (and
> maybe on Linux?) there are facilities built-in to get screen shots. For
> example,
> Alt-Print Screen on Windows captures a bitmap image of the active window,
> which
> can then be pasted into various applications, including Word.
>
> Converting to jpeg is NOT a small job. A jpeg is extremely different from a
> bitmap image. Any easily-implemented screen capture will necessarily be a
> bitmap
> image, and therefore necessarily low-resolution for print purposes.
>
> For many purposes one wants something much better than a bitmap image. In
> the
> contributed section of vpython.org the povexport utility generates a file
> that
> can be read by the freeware POV-ray application to generate a
> high-resolution
> ray-traced image of a VPython scene.
>
> A separate issue is that it would be very useful, and probably not very
> difficult, to generate a PostScript file from a (two-dimensional) graph in
> order
> to produce high-resolution prints of graphs.
>
> Bruce Sherwood
>
> Anders Wallin wrote:
> > Hi all,
> >
> > Why is there no screenshot function in visual?
> >
> > I've looked a bit at SDL/OpenGL in C++ under Ubuntu, and it's about a
> > 5 min job to google for the correct screenshot code and get it
> > working. It saves a 24-bit TGA-file, but I imagine changing that to
> > bmp or jpeg or similar is not a big job either. I must be missing
> > something?
> >
> > thanks,
> >
> > Anders
>
>
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