Why is there a background layer with the clouds image in your animation?
Without the background image, the illusion of clouds moving will be shadowed by the fact it does not look realistic. With the cloud background that stays static, I've introduced the element of depth into the animation. Also, having an image in the background allowed me to make the clouds animation heavily transparent and still have the illusion of clouds moving.
But you should understand that you will not add a background image for all image scrolls. Because clouds that are close to the ground have a hazy, transparent feel, it looks natural. If you have a background layer of the New York City skyline and have a transparent skyline of NYC moving from left to right as your animation......it will look ridiculous to the person viewing the animation! A building does not look transparent when looked at directly. You have to use your judgment on whether to use a background layer or not.
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