PNG pronounced ping is a format for storing bitmapped (raster) images on computers. It was created originally to replace the GIF file format when it was announced that the companies who created the GIF format wanted royalties. PNG uses indexed colors and lossless compression (like a .GIF file), but without those copyright limitations; it cannot be animated like a GIF image.
PNG images are in many ways better than .GIF as they also include an 8-bit transparency channel, which allows the colors in the image to fade from opaque to transparent; GIF images only support fully opaque or fully transparent pixels. PNG supports palettes of 24-bit RGB colors, RGB images or greyscale or RGB images. PNG was intended to be able to transfer images on the Internet, not professional graphics, and so does not support other colour spaces (such as CMYK).
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The .pcx file extension was developed in the 1980s by the ZSoft Corporation. It has since been superseded by other image formats such as png, giff and jpeg. The file type is used rarely at present, however certain scanning devices still output to the .pcx format.
The PCX format was one of the first common bitmap image formats. A PCX file comprises of three elements: the header, image data and the 256 colour palette. PCX utiises a lossless compression technique. The compression technique used is not processor intensive which was an advantage at the time of development due to the relatively limited processing power of hardware in the 1980s.
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