pytwain 2.3.0

TWAIN API for accessing scanners, cameras, etc on Windows

pytwain

This library allows acquiring images from various sources that support TWAIN protocol, e.g. scanners.

To install this library run:

pip install pytwain

Once installed you can run following sample Python script to acquire an image:

from io import BytesIO
import twain
import tkinter
from tkinter import ttk
import logging
import PIL.ImageTk
import PIL.Image

scanned_image = None


def scan():
    global scanned_image
    with twain.SourceManager(root) as sm:
        # this will show UI to allow user to select source
        src = sm.open_source()
        if src:
            src.request_acquire(show_ui=False, modal_ui=False)
            (handle, remaining_count) = src.xfer_image_natively()
            bmp_bytes = twain.dib_to_bm_file(handle)
            img = PIL.Image.open(BytesIO(bmp_bytes), formats=["bmp"])
            width, height = img.size
            factor = 600.0 / width
            # Storing PhotoImage in global variable to prevent it from being deleted once this function exits
            # since PhotoImage has a __del__ destructor
            scanned_image = PIL.ImageTk.PhotoImage(img.resize(size=(int(width * factor), int(height * factor))))
            frm.destroy()
            ttk.Label(root, image=scanned_image).pack(side="left", fill="both", expand=1)
        else:
            print("User clicked cancel")


logging.basicConfig(level=logging.DEBUG)
root = tkinter.Tk()
frm = ttk.Frame(root, padding=10)
frm.grid()
ttk.Button(frm, text="Scan", command=scan).grid(column=0, row=0)
root.mainloop()

Full documentation for the library located here.

This library uses ctypes to access TWAIN API, therefore it does not require compilation and can work with Pypi.

References

• https://twain.org/
• http://pytwain.readthedocs.org/