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 
 
 
 
 
 
 
 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: 
   
 source: https://collart.app/choose-aspect-ratio-social-media-guide/ 
 Aspect ratio's used in film: 
 
 
 
 
 
 
 
 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. 
 
 The "i" denotes the use of  interlaced scanning , with video quality being lower when compared to the entire frame transmission, 
 While the "p" signifies  progressive scan . 
 
 
 
 
 
 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.