compose "over" + convert png->jpg + white background

[abeering]

Hey imagemagick dudes,

I'm struggling here to figure out what I'm doing wrong.

So first I just wanted to compose two png layers over one another and convert to jpg:

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convert ./1.png ./2.png -compose over -composite 3.jpg

This works fine, but the background is black, and I want it to be white. I found through some other answers that I can use "flatten" to solve this, but I think that's strictly for conversion and not composition over.

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convert -background white -flatten ./1.png ./2.png -compose over -composite 3.jpg

This fails.

I'm figuring there is something I need to do using parentheses, or to first convert and then compose, or something like that. But I'm having a hard time figuring what's best to do? Ideas?

P.S This is an example of two layers, but I also need to do images with up to 10 layers.

[snibgo]

Before you write the JPEG, flatten against white:

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{...} -background White -layers Flatten out.jpg

Yes, you had this, but in the wrong place.