A file to store text created using free software based on OpenOffice. It’s used to store books, reports, notes, and other textual information. The file has an XML structure, is used as an alternative DOC format and has an open source code.
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.