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Resolution & Aspect Ratio

What is Resolution in video?

Resolution in video refers to the number of pixels that make up each frame, typically expressed as width x height in pixels (e.g., 1920 x 1080). Higher resolution means more pixels, resulting in clearer and more detailed image.
Resolution Type Common Name Aspect Ratio Pixel Size
SD (Standard Definition) 480p 4:3 640 x 480
HD (High Definition) 720p 16:9 1280 x 720
Full HD (FHD) 1080p 16:9 1920 x 1080
QHD (Quad HD) 1440p 16:9 2560 x 1440
2K video 1080p 1:1.77 2048 x 1080
4K video or Ultra HD (UHD) 4K or 2160p 1:1.9 3840 x 2160
8K video or Full Ultra HD 8K or 4320p 16∶9 7680 x 4320

image.pngimage.png

The size of the projection, depends on the distance between the projector and the screen and the type of lens used (throw factor) To Calculate the real life size of your screen in (centi)meters depending on the projector specs; use this tool: 

https://www.projectorcentral.com/projection-calculator-pro.cfm

Other Websites for resolution, pixel and aspect ratio calculations:

https://calculateaspectratio.com/

https://pixelcalculator.com/en/index.php

Different aspect ratio diagrams

An aspect ratio is the relationship between a video's width and height, typically expressed as two numbers separated by a colon (e.g., 16:9). Common aspect ratios include 16:9 for widescreen and 4:3 for standard television. 

These are all measured in square pixels. (when working with analogue video systems there was temporarily a time we used anamorphic pixels to squish 16:9 content into 4:3 and unsquish it in the edit. A herritage (to do with changing standards, expensive sensors & lenses that solve the problem) from before digital video that you may still encounter...) 

Most common used aspect ratio's:

social-media-aspect-ratio-cropping-collart-free-collage-maker-photo-editor-min.png 

source: https://collart.app/choose-aspect-ratio-social-media-guide/

Aspect ratio's used in film:

Aspect_ratios_for_film_(comma_separator_version).png

Comparison_of_film_aspect_ratios.jpg

Aspect_Ratio_Chart.svg.png

Source: https://en.wikipedia.org/wiki/Aspect_ratio_(image)

What Do "p" and "i" Mean in Resolution?

People specify just the height (often referred to as either ‘p' or ‘i') when talking about resolutions. This implies that the height and width have a standard 16:9 aspect ratio.

p = Progressive video i = Interlaced video
A video source listed with the letter "p" is known as Progressive scan. A video source listed with the letter "i" is known as Interlaced scan.
Example: 1080p, 720p, or 480p. Example: 1080i or 480i.
Displays both odd and even scan lines (the complete video frame) simultaneously. You need a HDMI Cable (of high speed) to transmit the video signal in 1080p. Displays odd and even scan lines as individual fields. First, the screen draws even scan lines, followed by odd scan lines. Two odd and even scan line fields result in one video frame.


 

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