What is a PDF File?
The Portable Document Format, or PDF, is a document publishing and distribution format. It has become an extremely popular format for distributing documents within different industries, educational institutes and last but certainly not the least on the Web. PDF files are readable and printable everywhere regardless of the operating system of the user, be it Windows, Linux or OS X. There are three forms of PDF files, namely, PDF Normal, PDF Searchable Image and PDF Image Only.
How is PDF Files Compressed
All PDF files are subject to the identical file size problems that all image formats such as TIFF, JPEG and BMP are subject to. PDF file size is a major issue. There are two methods in which the user can compress his or her pdf files. Depending on the nature of image, color range of the image and its resolution, the user can consider to go for an Image Compression process as well as Composite PDF process.
Why is It Necessary?
The image compression involves a series of techniques used to decrease the size of the image file sizes. This technique involves eliminating unnecessary information o as well as data that can be recreated before it is displayed. There are two ways in which image compression can be done - lossy compression and lossless compression. While Lossy compression, as the name implies, loses some details during compression. This makes the image less shaper with smoother color distribution. This makes it ideal for color photography. Here the user can choose the file size to which he or she wants the image file to be shrunk and the quality of the image needed after compression. Lossless compression is done without compromising on the quality of the image shrunk. None of the details of the image is lost while compressing. The biggest advantage of this type of compression is that the image can be restored to its original size without losing its clarity or sharpness. On the other hand, composite PDF process strikes the balance by achieving purely bitonal text and white space areas along with true color.