Blender Script draft - Copy image to clipboard

blender_copy_image_to_clipboard.py

'''
Blender Script - Copy "Viewer Node" image to clipboard


- Windows only
- needs: Python module: Pillow (PIL)


ref:
    python - Copy PIL/PILLOW Image to Windows Clipboard - Stack Overflow
    http://stackoverflow.com/questions/21319486/copy-pil-pillow-image-to-windows-clipboard
'''


import bpy
import numpy as np
from PIL import Image


def main():
    img0 = bpy.data.images['Viewer Node']
    W,H = img0.size

    #px0 = img0.pixels[:]
    px0 = [min(max(v, 0), 1) for v in img0.pixels] ## <!> clamp
    pixels = np.array([int(v*255) for v in px0])
    pixels.resize(W, H*4)
    pixels = np.flipud(pixels).flatten()

    import array
    pimg = Image.frombytes("RGBA", (W,H),  array.array("B", pixels).tostring()  ) ## convert pixels(list) to bytes-stream
    clipboard_copy_image(pimg)

    print('copied the image to clipboard')


def clipboard_copy_image(pimg):
    import io

    import ctypes
    msvcrt = ctypes.cdll.msvcrt
    kernel32 = ctypes.windll.kernel32
    user32 = ctypes.windll.user32

    output = io.BytesIO()
    pimg.convert('RGB').save(output, 'BMP')
    data = output.getvalue()[14:]
    output.close()

    CF_DIB = 8
    GMEM_MOVEABLE = 0x0002

    global_mem = kernel32.GlobalAlloc(GMEM_MOVEABLE, len(data))
    global_data = kernel32.GlobalLock(global_mem)
    msvcrt.memcpy(ctypes.c_char_p(global_data), data, len(data))
    kernel32.GlobalUnlock(global_mem)
    user32.OpenClipboard(None)
    user32.EmptyClipboard()
    user32.SetClipboardData(CF_DIB, global_mem)
    user32.CloseClipboard()


main()

To install Pillow into Blender Python:

1. download get-pip.py from https://pip.pypa.io/en/latest/installing/
2. install pip & install pillow through pip:
   $ cd blender/2.xx/python
   $ bin/python.exe get-pip.py
   $ Scripts/pip.exe
   $ Scripts/pip install pillow

If copied image's colors had changed, check Blender > Scene > "Color Management" settings.

it only copies an empty square into memory(black in BMP and just alpha in PNG) , and not even in the size of the render.