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1) There are several ways of doing that, such as by using globals, modules or saving to external file, or you can just pass parameters to another scene by including them in the options table in composer.gotoScene. You can read about that in the documentation: https://docs.coronalabs.com/api/library/composer/gotoScene.html
2) Have a look at filter.brightness and filter.contrast at https://docs.coronalabs.com/guide/graphics/effects.html
3) Welcome to the forums, but try to google first as your questions yield immediate results on the forums and in the documentation.
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