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PDF is an electronic document format designed by Adobe Systems using some language features PostScript. The official program for viewing documents in this format, Adobe Reader. Most often, PDF-file is a combination of text with raster and vector graphics and text forms, scripts written in JavaScript and other types of items.

Format for representing colors in the three primary colors (red, green and blue), each of which has 255 gradations. In contrast to the standard RGB, it allows you to change the transparency of the entire image using the opacity parameter. It is less flexible in terms of transparency settings than RGBA.