New answers tagged animation
Although this is more or less opinion based, I'd say After Effects might be worth to look at. It plays well with other Adobe products, so importing a multi layer .psd containing your graphics to a ae project is not a problem it all. It also meets most of your specifications, AE allows you to set values at certain keyframes and AE calculates the frames ...
Found the answer. If I click on the right arrow before the timeline layer name, it opens like: If I select the last frame, press CTRL + T (on Windows) I can then resize the final size of the image in the zoom sequence.
Your method didn't work for me, but quite to my surprise, I found another one on my own which worked fine: go to Layers Window (CTRL + L), uncheck all layers which wouldn't show missing background (i.e. gray-checkered surface), open all of them in turn then every time go to Layer menu (my Layers Window was not cooperative for that), open ...
You can use Adobe Animate 2015. It supports SVG.
Your best bet would be to use an SVG animation (SVGs are great for this because they don't care too much about scaling, its perfect no matter how you scale it). If you can make an animation in an SVG editor such as Illustrator or Inkscape, then import it into your html file via the xml code, hook it up to a scroll library like scrollmagic and you're set!
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