PDF documents can exist separately from the OS or hardware tools with which they were developed. It is developed by Adobe Systems using separate PostScript resources. PDF – is a cross-platform extension necessary for the visualization of printed materials in electronic form. Images are different in small weight with good quality. Most programs allow you to open such files. However, as a non-professional format, PNG can not display other color spaces. It supports 24-bit RGB colors, matching images, and shades of gray. The technology is limited to an 8-bit transparency channel so that you can adjust the colors from opaque to transparent. The PNG extension was proposed as a tool that helps to transfer and store images on the World Wide Web. However, it does not allow us to save several pictures in one file at once, limiting its use in the development of animated images. The PNG technology ensures the preservation of all stages of editing and the restoration of the step by preserving the quality. PNG is based on the best features of the predecessor, including lossless compression and transparent background support. However, they are both raster image types. PNG – is a scan-line graphic format developed as an alternative to GIF, a commercial license.
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