PDF and Its Advantages
PDF file format has evolved over a few decades to become the de facto standard in digital archival. It's usage in day-to-day digital documentation has also reached tremendous proportions, and it can be said that a lot of document transactions over the Internet happen in PDF format. The element that makes PDF such a ubiquitous format for documentation is portability. Portability means that a PDF can be taken to any hardware, software, and Operating System, and the file will still preserve the formatting of text, images, columns and tables. Although this is a great advantage, the addition of layers and layers of information in a PDF has resulted in an ever-increasing PDF file size.
The result of large PDF file sizes is the storage cost, and the fact that the huge size prevents transfer of files over a network. Since sharing is the key to the survival of PDF format, the size-problem is tackled by downsizing the PDF file. Downsizing PDFs can be done using software that are easily available off-the-shelf. They automate the lengthy process of manually downsizing each file. They also allow ways to downsize multiple PDF files. Downsizing a PDF can be done by making changes in individual elements of the file, such as the images, text, bookmarks, hyperlinks, annotations, and so on. While some elements like embedded fonts can be easily removed for downsizing, other elements like text and images can be efficiently compressed.
PDF Downsizing Tricks
The compression of images and text can be performed using lossless as well as lossy algorithms like JPEG, JPEG2000, JBIG2, CCITT, and ZIP. The PDF file can also be optimized if it is meant only for web usage. The downsizing, in this case, takes place by removing the non-web-friendly color information from images and text and lowering the resolution of the PDF file. The resolution of a PDF file for general printing should be around 300DPI (Dots Per Inch), whereas that for web-usage can be almost half of that for efficient downsizing. Another way of downsizing PDFs is to re-save them using `Save As'. This re-creates the PDF and removes all extraneous information that was created in the file format during editing.