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The line height, c, is the precursor of the em. In metal type, the point size (and hence the em, from em quadrat) was equal to the line height of the metal body from which the letter rises. In metal type, the physical size of a letter could not normally exceed the em.
An image that is 2048 pixels in width and 1536 pixels in height has a total of 2048×1536 = 3,145,728 pixels or 3.1 megapixels. One could refer to it as 2048 by 1536 or a 3.1-megapixel image. The image would be a very low quality image (72ppi) if printed at about 28.5 inches wide, but a very good quality (300ppi) image if printed at about 7 ...
The DTP point is defined as 1 ⁄ 72 of an inch (or exactly 0.352 7 mm) and, as with earlier American point sizes, is considered to be 1 ⁄ 12 of a pica. In metal type, the point size of a font describes the height of the metal body on which that font's characters were cast.
The 1280 × 1024 resolution is not the standard 4:3 aspect ratio, instead it is a 5:4 aspect ratio (1.25:1 instead of 1. 3:1). A standard 4:3 monitor using this resolution will have rectangular rather than square pixels, meaning that unless the software compensates for this the picture will be distorted, causing circles to appear elliptical.
Pixel aspect ratio 1:1 Pixel aspect ratio 2:1. A Pixel aspect ratio (often abbreviated PAR) is a mathematical ratio that describes how the width of a pixel in a digital image compared to the height of that pixel. Most digital imaging systems display an image as a grid of tiny, square pixels.
Height (px) Aspect ratio Actual pixel count Megapixels Camera examples 32 32 1:1. 1024 ... Phase One PowerPhase FX/FX+ (line scanner) 18,000 8,000 9:4 144,000,000
The lowest 4 bits are significant, however the Vertical scroll value should range from 0 to the ANTIC Mode line's scan line height - 1. Scrolling farther than the ANTIC Mode's number of scan lines results in lines of repeated data upsetting the fine scrolling continuity (though, this can also be used as an exploitable behavior).
For full HDTV resolution, this one minute of arc implies that the TV watcher should sit 3.2 times the height of the screen away (optimal viewing distance). At this distance, the individual pixels cannot be resolved while simultaneously maximizing the viewing area.