I really should be writing my English assignment instead of this, but blender comes first!
I was digging around wikipedia, namely film aspect ratios
I was wondering why so many youtube tutorials recommend “adding the cinema ‘bars’ for cinema effect.” i.e adding two big blocks of black over the footage in post processing, and I thought to myself, What if I do want cinema’esq rendering in blender? what should I render at?
Taking that most films are (might) 2.35:1, I wanted to find my new rendering dimensions!
Well!! A little bit later I ran across this fantastic web page.
I put in the width 1920, to preserve the common HD format, regularly used in YouTube and TV videos, and chose the aspect ration 2.35:1, and calculated a vertical dimension of 817 pixels.
This means that, when rendering in blender at 1920x817, the resolution will be less than 1080p, HOWEVER, when composited or post processed say, in After Effects, because of the size and dimensions of the render, two cinema’esq black bars will be present in the top and bottom.
This technique would be superior to rendering at stock standard 1080p, then compositing post letterbox visuals in. By rendering at 1920x817, you render 504,960 LESS pixels, possibly reducing render time.
Hope this helps with all you budding short film producers!