How do I increase red referencing each pixel by position number?

Each pixel has an index number (a position in the list of pixels) associated with it. We can manipulate pictures by indexing them by number, too.

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I want to know:

How do I decrease red in a picture?
How do I decrease green in a picture?
How do I change pictures left-to-right, rather than top-to-bottom?
How do I draw a box on a picture?
How do I increase volume in a sound by index value?

Last modified 22 September 2016 at 8:08 pm by Mark Guzdial