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pixel graphics

Pixel graphics are made up of individual pixels, with each pixel representing a digital value. This depends on the color model used and the quantization.

The data volume of a pixel graphic is calculated from the vertical and horizontal resolution multiplied by the quantization. For example, a black and white graphic with a resolution of 640 x 480 pixels in Video Graphics Array( VGA) and a color depth of 1 bit ("0" corresponds to black, "1" corresponds to white) has a file size of 38 KB. However, assuming a resolution of 2,048 x 1,536 for Quadruple-XGA( QXGA) and a color depth of 24 bits, or 3 bytes, the uncompressed file size is 9.5 MB.

Pixel representation of a 4x4 pixel graphic in original size and enlarged

Pixel representation of a 4x4 pixel graphic in original size and enlarged

Key differentiators between the various pixel formats such as JPEG, Photoshop, Tagged Image File Format( TIFF), Bitmap, the Graphics Interchange Format( GIF), the PICT file format, Portable Network Graphics( PNG), the TGA file format and some more, are the type of compression, the color models used and the color depth.

File formats for pixel graphics

File formats for pixel graphics

Typical pixel graphics are the representation of images, photos or of presentation graphics; they are almost always represented as raster graphics.

Informations:
Englisch: pixel graphics
Updated at: 04.12.2007
#Words: 190
Links: picture element (Pixel), graphics, digital, color model, quantization
Translations: DE
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