Question

What’s the fastest way, in ubuntu 11.10, to take a screenshot with python and convert the screenshot into a format that’s compatible with this question about image template matching?

Answer 1

xpresser is a project that works in ubuntu that also uses opencv. In the xutils module there’s a function to take a screenshot which is as follows:

def take_screenshot(x=0, y=0, width=None, height=None):
    window = gtk.gdk.get_default_root_window()
    if not (width and height):
        size = window.get_size()
        if not width:
            width = size[0]
        if not height:
            height = size[1]
    pixbuf = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, False, 8, width, height)
    pixbuf = pixbuf.get_from_drawable(window, window.get_colormap(),
                                      x, y, 0, 0, width, height)
    array = pixbuf.get_pixels_array()
    return Image("screenshot", array=array,
                 width=array.shape[1], height=array.shape[0])

I hope this helps.