Frames Not Disappearing In Python Wand

As per hint from here, I tried to create a gif with 2 dissimilar images as below. It works, but one frame is not disappearing to show another frame. Why would this happen and how t

Solution 1:

Updated answer

... I got error using that ...

Looks like hardcoded validation values does not allow this technique to be leveraged. This is a bug, and I'll submit a patch upstream.

@ -2548,7 +2548,7 @@ class BaseImage(Resource):
         .. versionadded:: 0.4.3

         """
-        if method not in ['merge', 'flatten', 'mosaic']:+        if method not in IMAGE_LAYER_METHOD:
             raise TypeError('method must be one of: merge, flatten, mosaic')

Currently, wand doesn't implement the C-API methods MagickSetImageDispose, or MagickExtentImage which is what I believe you need. Although it's fairly easy to implement those methods, you may be stuck with rebuilding each image - frame-by-frame.

from wand.image import Image as Image2
from wand.color import Color
from wand.compat import nested

with nested(Image2(),
            Image2(filename='d2.gif'),
            Image2(filename='d3.gif')) as (wand, one, two):
    width = max(one.width, two.width)
    height = max(one.height, two.height)
    # Rebuild images with full extent of framewith Image2(width=width, height=height, background=Color('WHITE')) as f1:
        f1.composite(one, 0, 0)
        wand.sequence.append(f1)
    with Image2(width=width, height=height, background=Color('WHITE')) as f2:
        f2.composite(two, 0, 0)
        wand.sequence.append(f2)
    # Create progressive delay for each framefor cursor inrange(2):
        with wand.sequence[cursor] as frame:
            frame.delay = 100
    wand.type = 'optimize'
    wand.save(filename='animated.gif')

Original answer DO NOT USE!

---

You want to call wand.image.Image.merge_layers method, not wand.image.Image.type property.

Try the following...

with Image2() as wand:
    # Add new frames into sequance
    with Image2(blob=d2) as one:
        wand.sequence.append(one)
    with Image2(blob=d3) as two:
        wand.sequence.append(two)

    # Create progressive delay for each frame
    for cursor in range(2):
        with wand.sequence[cursor] as frame:
            frame.delay = 100
    # Set layer type
    wand.merge_layers('optimize')  # or 'optimizeimage', or 'composite'
    wand.save(filename='animated.gif')