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 WBMP file format is a now obsolete file type that was used by early mobile phones to exchange and store images. WBMP files are black and white only. The WBMP format was succeeded by the PNG format for use by WAP mobile phones as this provided colour support. A requirement for a WAP specific image format has been rendered increasingly unnecessary due to the advent of smartphones and their support of a range of image formats.
A .WBMP file is saved in bit format. This means that each pixel represents 1 bit. Each pixel can be black or white. Each WBMP file is comprised of a type field, a header field, a width value, a height value and the data for the image itself.
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