# Background

In an animation, text scrolls horizontally across the screen (from left to right), stopping on the far right. For example:

The background is transparent and no other objects are in the scene. Blender creates PNG frames at 720p, as expected.

# Problem

Blender spends time rendering image parts that will only be transparent. The CTRL+b command allows for rendering a subsection of the image, but appears to produce an image that is not 720p.

# Question

How would you create a 1280x720 PNG image but only render a horizontal band (see below) where the text is animated?