Open XML Paper Specification known as XPS consists of structured XML markup that determnes the layout and visual appearance of each page within the document. The markup language is a subset of XAML which allows it to incorporate vector-graphics in documents. Microsoft developed XPS with the intention of creating an alternative to PDF.
An XPS file is a unicode ZIP archive which use the Open Packging Conventions and contain the files which make up the document. The files includes are an XML markup file, text, embedded fonts, raster images, 2D vector graphics and any DRM (Digital Rights Management) information. These contents can be reviewed by opening in an application that supports ZIP files.
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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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