The two most popular forms of computer, PCs that used Windows and Apple Macintosh computers, used two different operating systems and file structures. Back in the 1990s, the managing team at Adobe saw that there was a problem facing computer users. It already featured internal links and bookmarks and fonts could be embedded but the only color space supported was RGB. This first version was of no use to the prepress community. the order in which a human expects to read it. The PDF file format is nearly 30 years old, which is a testament to how effective it’s been. The tools to create and view PDF-files, Acrobat, were released in on 15 June 1993. In contrast, the logical structure tree arranges page contents according to their logical order, i.e. Tagged PDF solves the potential conflict between content creation order and logical reading order: the contents of a PDF page can be placed in any order, but reading text in this native order does not necessarily match the logical order of page contents. These items represent the content associated with a structure element.
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