Why is It Necessary to Compress a PDF File
PDF is a flexible file format, which is device and platform independent. Moreover, PDF format is designed to compress text and images. This accounts for its immense popularity as the format for file storage and transfer. PDF files are often compressed to shorten their file size. In a typical work day, it becomes inconvenient to handle huge PDF files. The user may not be able to send it through email and may encounter an error message instead. In addition, it is necessary to compress a PDF file to save some storage space.
What Kind of Data is Compressed
The PDF file compression is executed by program using formulas and algorithms to chart out the best method to compress files. The algorithm used in the PDF file compressor determines the quality of the compressed file. Compression to PDF files refers to not only to image compressing as well as text compression. Text compression is made simple by removing all extra space characters, inserting a single repeated character (to indicate a string of repeated characters), and substituting smaller bit strings for frequently occurring characters. This kind of compression will reduce a text file to 50% of its original size. Compression is performed by a program that uses an algorithm to determine how to compress or decompress data.
What is Lossy Compression What is Lossless Compression
The PDF compressor algorithms can be broadly divided into two, based on the way it works on the file. They are lossy algorithm and lossless algorithm. In a Lossless algorithm, the compressed file can be restored to the original without losing the quality or information. Lossy algorithm filters out data in the file and discards some information, to make the document smaller. This works well for ordinary image and sound files. However, the discarded details are lost forever. So when restored, these files do not have the same quality or clarity. In spite of this loss of quality, lossy compression is popular, as it can compress files to any desired sizes.