Output compression options

This may not be in-scope but I noticed that the png output is pretty large and uncompressed.
In fact XCode is giving [this warning](https://stackoverflow.com/questions/75151249/ios-app-warning-the-launch-screen-exceeds-the-memory-limit-and-may-not-display?noredirect=1#comment132616790_75151249).

> The launch screen exceeds the memory limit and may not display during app launch. Use images requiring less space

This ticket is a feature request to add max-file size targets to images. If an output file would exceed the budget perhaps compression could kick in.

Here is the default output folder and `compresspng` is compressed versions of those files.