Pixel
A Pixel is a single point of illumination, one of many that creates a graphic on screen. Some graphics like CGI are initially made up of polygons and rendered which takes the geometry and changes it into viewable pixels that make up an image.
Image Resolution
Image resolution is the detail within a digital image, film or game.The image will be have better quality and detail depending on how high the resolution is. Resolution consists of how many vertical lines can be close to each other without the image losing quality, the more lines, the higher the resolution.
For example a 1080p monitor is 1920 wide, 1080 tall.
Source - https://recombu.com/digital/article/what-is-hd-the-difference-720p-1080i-and-1080p_M10888.html
Picture Resolution
Picture resolution is the quality a picture can be printed at, the more pixels the better quality.
Intensity
Every pixel has a pixel value which is the colour and brightness of that pixel. The most common pixel format is the 'byte image' where the stored as an 8-bit integer giving a range of 0-255. (0 being black, 255 being white and anything inbetween is a different shade of gray.
Picture Element
A picture element is the smallest physical point in a raster image which means it's the smallest controllable point on an on screen image.
A picture element is the smallest physical point in a raster image which means it's the smallest controllable point on an on screen image.
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