Take a screenshot via a python script. [Linux]

Question

I want to take a screenshot via a python script and unobtrusively save it.

I'm only interested in the Linux solution, and should support any X based environment.

Answer 1

I have a wrapper project (pyscreenshot) for scrot, imagemagick, pyqt, wx and pygtk. If you have one of them, you can use it. All solutions are included from this discussion.

Install:

easy_install pyscreenshot

Example:

import pyscreenshot as ImageGrab

# fullscreen
im=ImageGrab.grab()
im.show()

# part of the screen
im=ImageGrab.grab(bbox=(10,10,500,500))
im.show()

# to file
ImageGrab.grab_to_file('im.png')

Answer 2

I couldn't take screenshot in Linux with pyscreenshot or scrot because output of pyscreenshot was just a black screen png image file.

but thank god there was another very easy way for taking screenshot in Linux without installing anything. just put below code in your directory and run with python demo.py

import os
os.system("gnome-screenshot --file=this_directory.png")

also there is many available options for gnome-screenshot --help

Application Options:
  -c, --clipboard                Send the grab directly to the clipboard
  -w, --window                   Grab a window instead of the entire screen
  -a, --area                     Grab an area of the screen instead of the entire screen
  -b, --include-border           Include the window border with the screenshot
  -B, --remove-border            Remove the window border from the screenshot
  -p, --include-pointer          Include the pointer with the screenshot
  -d, --delay=seconds            Take screenshot after specified delay [in seconds]
  -e, --border-effect=effect     Effect to add to the border (shadow, border, vintage or none)
  -i, --interactive              Interactively set options
  -f, --file=filename            Save screenshot directly to this file
  --version                      Print version information and exit
  --display=DISPLAY              X display to use

Answer 3

This one works on X11, and perhaps on Windows too (someone, please check). Needs PyQt4:

import sys
from PyQt4.QtGui import QPixmap, QApplication
app = QApplication(sys.argv)
QPixmap.grabWindow(QApplication.desktop().winId()).save('test.png', 'png')

Answer 4

Just for completeness: Xlib - But it's somewhat slow when capturing the whole screen:

from Xlib import display, X
import Image #PIL

W,H = 200,200
dsp = display.Display()
root = dsp.screen().root
raw = root.get_image(0, 0, W,H, X.ZPixmap, 0xffffffff)
image = Image.fromstring("RGB", (W, H), raw.data, "raw", "BGRX")
image.show()

One could try to trow some types in the bottleneck-files in PyXlib, and then compile it using Cython. That could increase the speed a bit.

---

Edit: We can write the core of the function in C, and then use it in python from ctypes, here is something I hacked together:

#include <stdio.h>
#include <X11/X.h>
#include <X11/Xlib.h>
//Compile hint: gcc -shared -O3 -lX11 -fPIC -Wl,-soname,prtscn -o prtscn.so prtscn.c

void getScreen(const int, const int, const int, const int, unsigned char *);
void getScreen(const int xx,const int yy,const int W, const int H, /*out*/ unsigned char * data) 
{
   Display *display = XOpenDisplay(NULL);
   Window root = DefaultRootWindow(display);

   XImage *image = XGetImage(display,root, xx,yy, W,H, AllPlanes, ZPixmap);

   unsigned long red_mask   = image->red_mask;
   unsigned long green_mask = image->green_mask;
   unsigned long blue_mask  = image->blue_mask;
   int x, y;
   int ii = 0;
   for (y = 0; y < H; y++) {
       for (x = 0; x < W; x++) {
         unsigned long pixel = XGetPixel(image,x,y);
         unsigned char blue  = (pixel & blue_mask);
         unsigned char green = (pixel & green_mask) >> 8;
         unsigned char red   = (pixel & red_mask) >> 16;

         data[ii + 2] = blue;
         data[ii + 1] = green;
         data[ii + 0] = red;
         ii += 3;
      }
   }
   XDestroyImage(image);
   XDestroyWindow(display, root);
   XCloseDisplay(display);
}

And then the python-file:

import ctypes
import os
from PIL import Image

LibName = 'prtscn.so'
AbsLibPath = os.path.dirname(os.path.abspath(__file__)) + os.path.sep + LibName
grab = ctypes.CDLL(AbsLibPath)

def grab_screen(x1,y1,x2,y2):
    w, h = x2-x1, y2-y1
    size = w * h
    objlength = size * 3

    grab.getScreen.argtypes = []
    result = (ctypes.c_ubyte*objlength)()

    grab.getScreen(x1,y1, w, h, result)
    return Image.frombuffer('RGB', (w, h), result, 'raw', 'RGB', 0, 1)

if __name__ == '__main__':
  im = grab_screen(0,0,1440,900)
  im.show()

Answer 5

Compile all answers in one class. Outputs PIL image.

#!/usr/bin/env python
# encoding: utf-8
"""
screengrab.py

Created by Alex Snet on 2011-10-10.
Copyright (c) 2011 CodeTeam. All rights reserved.
"""

import sys
import os

import Image


class screengrab:
    def __init__(self):
        try:
            import gtk
        except ImportError:
            pass
        else:
            self.screen = self.getScreenByGtk

        try:
            import PyQt4
        except ImportError:
            pass
        else:
            self.screen = self.getScreenByQt

        try:
            import wx
        except ImportError:
            pass
        else:
            self.screen = self.getScreenByWx

        try:
            import ImageGrab
        except ImportError:
            pass
        else:
            self.screen = self.getScreenByPIL


    def getScreenByGtk(self):
        import gtk.gdk      
        w = gtk.gdk.get_default_root_window()
        sz = w.get_size()
        pb = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB,False,8,sz[0],sz[1])
        pb = pb.get_from_drawable(w,w.get_colormap(),0,0,0,0,sz[0],sz[1])
        if pb is None:
            return False
        else:
            width,height = pb.get_width(),pb.get_height()
            return Image.fromstring("RGB",(width,height),pb.get_pixels() )

    def getScreenByQt(self):
        from PyQt4.QtGui import QPixmap, QApplication
        from PyQt4.Qt import QBuffer, QIODevice
        import StringIO
        app = QApplication(sys.argv)
        buffer = QBuffer()
        buffer.open(QIODevice.ReadWrite)
        QPixmap.grabWindow(QApplication.desktop().winId()).save(buffer, 'png')
        strio = StringIO.StringIO()
        strio.write(buffer.data())
        buffer.close()
        del app
        strio.seek(0)
        return Image.open(strio)

    def getScreenByPIL(self):
        import ImageGrab
        img = ImageGrab.grab()
        return img

    def getScreenByWx(self):
        import wx
        wx.App()  # Need to create an App instance before doing anything
        screen = wx.ScreenDC()
        size = screen.GetSize()
        bmp = wx.EmptyBitmap(size[0], size[1])
        mem = wx.MemoryDC(bmp)
        mem.Blit(0, 0, size[0], size[1], screen, 0, 0)
        del mem  # Release bitmap
        #bmp.SaveFile('screenshot.png', wx.BITMAP_TYPE_PNG)
        myWxImage = wx.ImageFromBitmap( myBitmap )
        PilImage = Image.new( 'RGB', (myWxImage.GetWidth(), myWxImage.GetHeight()) )
        PilImage.fromstring( myWxImage.GetData() )
        return PilImage

if __name__ == '__main__':
    s = screengrab()
    screen = s.screen()
    screen.show()

Answer 6

Try it:

#!/usr/bin/python

import gtk.gdk
import time
import random
import socket
import fcntl
import struct
import getpass
import os
import paramiko     

while 1:
    # generate a random time between 120 and 300 sec
    random_time = random.randrange(20,25)
    # wait between 120 and 300 seconds (or between 2 and 5 minutes) 

    print "Next picture in: %.2f minutes" % (float(random_time) / 60)

    time.sleep(random_time)
    w = gtk.gdk.get_default_root_window()   
    sz = w.get_size()
    print "The size of the window is %d x %d" % sz
    pb = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB,False,8,sz[0],sz[1])
    pb = pb.get_from_drawable(w,w.get_colormap(),0,0,0,0,sz[0],sz[1])
    ts = time.asctime( time.localtime(time.time()) )
    date = time.strftime("%d-%m-%Y")
    timer = time.strftime("%I:%M:%S%p")
    filename = timer
    filename += ".png"

    if (pb != None):
        username = getpass.getuser() #Get username
        newpath = r'screenshots/'+username+'/'+date #screenshot save path
        if not os.path.exists(newpath): os.makedirs(newpath)
        saveas = os.path.join(newpath,filename)
        print saveas
        pb.save(saveas,"png")
    else:
        print "Unable to get the screenshot."