The first picture is snapped from the video; the second picture is a picture from the open ImageB. Select the Fade transform from the list, and click the forward > button, you can watch the animation of the transform. Moving the tag of progress bar, you can set the position of the Fade. Then you can save the picture with .png format to a file.
2. Wipe Transform
You may select settings to change the width of the wipe area of two pictures.