Easily Transform Clip Size in DaVinci Resolve on iPad

Sometimes you need your clip to be larger or smaller, how do you do that in DaVinci Resolve on the iPad?
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[@clarewillison9379]

What about transforming a b-roll image? Say a green screen element you need much smaller than imported size?

[@bendesignsmedia]

Should be the same process regardless of the type of clip

[@clarewillison9379]

@@bendesignsmedia I’m brand new to this level of editing but was pro graphic designer and artist so understand some bits. I want to use an element (bought and paid for) but at a smaller size. Can use your method which works fine on the b-roll until clicking “add alpha output” which (as I’d expect from using alpha channels in photoshop etc) just masked the underlying (main) clip to a small window the same size as the one my now tiny green screened element is in.
I was hoping there’s a different method or additional step for layering elements and being able to place them in alternate positions or sizes than the original. Or do I need to work out exactly where and how big it needs to be and create that before adding it to the timeline b-roll?

[@bendesignsmedia]

@@clarewillison9379 hi, I'm not sure I'm following exactly what you are asking, let me just clarify. Are using DaVinci Resolve on the iPad or Desktop? It sounds like you have an A-roll clip on your first video track and a b-roll green screen clip on you second video track. Have you applied a key effect to your b-roll to remove the green screen already? Where are you choosing "add alpha output" from?

[@clarewillison9379]

@@bendesignsmedia sorry to be confusing: realised I had been watching a lot of different tutorials and posted this to you after someone else’s on green screen removal 🤦🏻‍♀️. I’m using iPad for now and yes, you’ve diagnosed correctly. It’s a graphic on the b-roll that needs repositioning and resizing over another clip on A-roll.
I resized and repositioned fine on cut page, then removed green screen on colour page using line qualifier, inverted, despill etc all worked great until I select add alpha output and connect the node. That results in a black screen with my correct sized graphic in a scaled rectangle giving a tantalising letterbox-style peek at the A-roll underneath.

[@bendesignsmedia]

@@clarewillison9379 no problem, green screen work can be confusing in DaVinci simply because there are so many ways to do it. I would suggest trying it using one of the keyers under effects on the cut page rather than from the color page. The color page is more advanced and more confusing to do a key on than just using a keyer effect in my opinion.
Place the keyer on the clip, then open the inspector (top right), switch to effects (magic wand), use eye dropper target and click on green.
The trick is that at first it will look like it has not worked, because to see it you have to switch the view from the color page, bottom left hand corner of the viewer (normally looks like an eye dropper) tap and switch to Open FX Overlay.