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

[Bruce S. <Bru...@nc...>]

And there is PIL, the Python Imaging Library, which can do lots of image 
conversions. But the fundamental problem is that you'll have a low-resolution 
bitmap image, which isn't good for many applications.

Bruce Sherwood

Stanley Sokolow wrote:
> 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... 
> <mailto: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 <http://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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