CODEWITHSUNDEEP
pythontkintertransparencyanimated-gif
user3064653
user3064653

Reputation: 31

No transparency in animated gif with Tkinter

I want to display an animated gif with Tkinter. I tried using the solutions proposed here.

The problem is that in my gif, only the first frame is complete. All other frame consist of a mostly transparent area where only the few pixels that change w.r.t. the preceding frame are non-transparent.

Hoe can I tell Tkinter that the background of those frames is supposed to be transparent?

from Tkinter import * 
from PIL import Image, ImageTk


class MyLabel(Label):
    def __init__(self, master, filename):
        im = Image.open(filename)
        seq =  []
        try:
            while 1:
                seq.append(im.copy())
                im.seek(len(seq)) # skip to next frame
        except EOFError:
            pass # we're done

        try:
            self.delay = im.info['duration']
        except KeyError:
            self.delay = 100

        first = seq[0].convert('RGBA')
        self.frames = [ImageTk.PhotoImage(first)]

        Label.__init__(self, master, image=self.frames[0])

        temp = seq[0]
        for image in seq[1:]:
            temp.paste(image)
            frame = temp.convert('RGBA')
            self.frames.append(ImageTk.PhotoImage(frame))

        self.idx = 0

        self.cancel = self.after(self.delay, self.play)

    def play(self):
        self.config(image=self.frames[self.idx])
        self.idx += 1
        if self.idx == len(self.frames):
            self.idx = 0
        self.cancel = self.after(self.delay, self.play)        


root = Tk()
anim = MyLabel(root, 'animated.gif')
anim.pack()

def stop_it():
    anim.after_cancel(anim.cancel)

Button(root, text='stop', command=stop_it).pack()

root.mainloop()

Upvotes: 3

Views: 2539

Answers (1)

Oblivion
Oblivion

Reputation: 1729

Looks like you need to supply a mask for the paste operation:

from Tkinter import * 
from PIL import Image, ImageTk


class MyLabel(Label):
    def __init__(self, master, filename):
        im = Image.open(filename)
        seq =  []
        try:
            while 1:
                seq.append(im.copy())
                im.seek(len(seq)) # skip to next frame
        except EOFError:
            pass # we're done

        try:
            self.delay = im.info['duration']
        except KeyError:
            self.delay = 100

        first = seq[0].convert('RGBA')
        self.frames = [ImageTk.PhotoImage(first)]

        Label.__init__(self, master, image=self.frames[0])

        lut = [1] * 256
        lut[im.info["transparency"]] = 0

        temp = seq[0]
        for image in seq[1:]:
            mask = image.point(lut, "1")
            # point() is used to map image pixels into mask pixels
            # via the lookup table (lut), creating a mask
            # with value 0 at transparent pixels and
            # 1 elsewhere
            temp.paste(image, None, mask) #paste with mask
            frame = temp.convert('RGBA')
            self.frames.append(ImageTk.PhotoImage(frame))

        self.idx = 0

        self.cancel = self.after(1000, self.play)

    def play(self):
        self.config(image=self.frames[self.idx])
        self.idx += 1
        if self.idx == len(self.frames):
            self.idx = 0
        self.cancel = self.after(self.delay, self.play)        


root = Tk()
anim = MyLabel(root, 'tumblr_m3i10ma4fI1qe0eclo1_r9_500.gif')
anim.pack()

def stop_it():
    anim.after_cancel(anim.cancel)

Button(root, text='stop', command=stop_it).pack()

root.mainloop()

Upvotes: 1

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