Created
March 14, 2018 10:12
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gif writer with pillow
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| """Write a gif where a line moves horizontally. | |
| Note that this code does not work with pillow 3.4.0 | |
| (only the first frame is written). | |
| Tested with pillow 5.0.0. | |
| """ | |
| from PIL import Image | |
| if __name__ == "__main__": | |
| SIZE = 100 | |
| images = [] | |
| # write the gif | |
| for offset in range(SIZE): | |
| img = Image.new('L', (SIZE, SIZE), 0) | |
| pixmap = img.load() | |
| for row in range(SIZE): | |
| pixmap[offset, row] = 255 | |
| images.append(img) | |
| first, *lasts = images | |
| assert lasts, "only one frame in gif" | |
| first.save('progress-bar.gif', save_all=True, append_images=images, duration=10) | |
| # count number of frames | |
| gif = Image.open('progress-bar.gif') | |
| nb_frame = 1 | |
| try: | |
| while True: | |
| gif.seek(gif.tell()+1) | |
| nb_frame += 1 | |
| except EOFError: | |
| pass | |
| assert nb_frame == SIZE, 'nb frame: ' + str(nb_frame) | |
| def basic_use(): | |
| import random | |
| from PIL import ImageDraw | |
| img = Image.new('RGB', (400, 400), (255, 255, 255)) | |
| draw = ImageDraw.Draw(img) | |
| draw.line((0, 5, 10, 5), (0, 0, 0), 2) | |
| draw.line((5, 0, 5, 10), (0, 0, 0), 2) | |
| img.save("test-bad-lines.png", 'PNG') | |
| rand = lambda: random.randint(0, 255) | |
| rand_color = lambda: (rand(), rand(), rand()) | |
| pixmap = img.load() | |
| for i in range(400): | |
| for j in range(400): | |
| pixmap[i, j] = rand_color() | |
| img.save("test-random.png", 'PNG') |
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