PDF Compression Techniques - an Overview
PDF, a page description language, is light weight and is highly manipulative by nature. Compression mainly involves removal of unnecessary objects and images in the document. An optimized, condensed PDF file occupies lesser storage space, making transmission and reception of the file speedy and more efficient. Compression can reduce PDF files to 50% of their original sizes. Some basic maneuvers a user can perform as ways to compress a PDF file include - using black and white images rather than colored ones, choosing the RGB color space rather than the CMYK if color pictures are a must, converting the whole document to greyscale, minimizing fonts, selecting the `save as' option rather than the `save' option, and so on. The `save as' command removes changes attached to the save command automated by the PDF software itself.
Ways to Compress a PDF File - Details
PDF compression software technologies involve a variety of algorithms that function in specialized fields for size reduction, and are important ways to compress a PDF file. The algorithms employed by the technologies are classified into lossy and lossless techniques, depending on the loss or saving of the information content of the original, uncompressed PDF file. Lossy techniques take chances on the information content, which may be lost permanently after compression. Lossless ways to compress a PDF file prove to be more effective in the long run, retaining the integrity of the document, giving back the same PDF file after decompressing its compressed version. CCITT, Flate, LZW, RLE, ZIP, are lossless compressions. The most popular lossy compression is JPEG compression. PDF compression basically means image compression. ZIP works well with images having large spans of repeating colors, or monotonous color frames. CCITT works best for paint images, and black and white pictures.
PDF Conversion Strategies and Advantages
JPEG is best suited for assorted, mixed photographic images, and handles them well, yielding a compressed but no quality compromise output. This is because it utilizes the human eye sensitivity that detects brightness rather than contrast changes. PDF compression strategies involve a collaboration and mixture of all these important ways to compress a PDF file, and give a wholesome output, which is an avalanche effort from all these algorithms. PDF is by itself the best format to compress, as it can be made text searchable easily, is elastic, economic, and is unanimously accepted and accessed anywhere, at anytime.