Wand Creates Empty Frame And Irregular Frame Rate

I have below snippet which creates a gif. This snippet is derived from hints here. The snippet creates an empty frame and frames have irregular delay between them. Notice delay bet

Solution 1:

As per hints given in solution here, I came up with below modified snippet which seems to solve the issue. Apparantly my requirement requires MagickSetImageDispose or MagickExtentImage which are not yet implemented in wand. I am very thank ful to emcconville for this help and request him to add his comments if any needed for below solution. I am still exploring. In case of any further issue on this problem, I will get back.

def render(self):

    wand = Image2()        

    #get max frame height, width
    frameSizeList = []
    tempImgList = []
    for each_frame in self._tree_dot_frames:
        img = Image2(blob=each_frame)
        frameSizeList.append((img.width,img.height))
        tempImgList.append(img)
    optimalFrameSize = (max(frameSizeList,key=itemgetter(1)))
    #print('Max Frame size detected: ',optimalFrameSize)

    #create frames
    for each_frame in tempImgList:
        newImg = Image2(width=optimalFrameSize[0], height=optimalFrameSize[1], background=Color('WHITE'))
        newImg.composite(each_frame,0,0)
        wand.sequence.append(newImg)

    #set frame rate
    for cursor in range(len(self._tree_dot_frames)):
        with wand.sequence[cursor] as frame:
            print('sequence width: {} height: {}'.format(frame.width,frame.height))
            frame.delay = 100

    #wand.merge_layers('merge')
    wand.format = 'gif'
    wand.save(filename='animated.gif')
    print('No of frames: {} gif width: {} height: {}'.format(len(wand.sequence),wand.width,wand.height))
    self._tree_dot_blob = wand.make_blob()

    return self._tree_dot_blob