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79 lines
1.8 KiB
Python
79 lines
1.8 KiB
Python
#!/usr/bin/env python
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#
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# The Python Imaging Library
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# $Id$
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#
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# this demo script illustrates how a 1-bit BitmapImage can be used
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# as a dynamically updated overlay
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#
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try:
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from tkinter import *
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except ImportError:
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from Tkinter import *
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from PIL import Image, ImageTk
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import sys
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#
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# an image viewer
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class UI(Frame):
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def __init__(self, master, im, value=128):
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Frame.__init__(self, master)
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self.image = im
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self.value = value
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self.canvas = Canvas(self, width=im.size[0], height=im.size[1])
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self.backdrop = ImageTk.PhotoImage(im)
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self.canvas.create_image(0, 0, image=self.backdrop, anchor=NW)
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self.canvas.pack()
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scale = Scale(self, orient=HORIZONTAL, from_=0, to=255,
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resolution=1, command=self.update_scale, length=256)
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scale.set(value)
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scale.bind("<ButtonRelease-1>", self.redraw)
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scale.pack()
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# uncomment the following line for instant feedback (might
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# be too slow on some platforms)
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# self.redraw()
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def update_scale(self, value):
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self.value = float(value)
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self.redraw()
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def redraw(self, event=None):
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# create overlay (note the explicit conversion to mode "1")
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im = self.image.point(lambda v, t=self.value: v >= t, "1")
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self.overlay = ImageTk.BitmapImage(im, foreground="green")
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# update canvas
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self.canvas.delete("overlay")
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self.canvas.create_image(0, 0, image=self.overlay, anchor=NW,
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tags="overlay")
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# --------------------------------------------------------------------
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# main
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if len(sys.argv) != 2:
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print("Usage: thresholder file")
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sys.exit(1)
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root = Tk()
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im = Image.open(sys.argv[1])
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if im.mode != "L":
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im = im.convert("L")
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# im.thumbnail((320,200))
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UI(root, im).pack()
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root.mainloop()
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