The Main Issues with PDF Files
By scanning paper documents of printed or handwritten forms onto the computer, and using software to convert into PDF, one can create PDF files. But most of the time, the scanned files are huge in size, occupying a large area of the hard disk memory. This is mainly because, when a document is scanned and converted to PDF format, the exact format of the source file is captured in the PDF. Page layout, background, text format, fonts and their sizes, etc are all copied to the PDF file thus making it big with regard to its size. Mailing such bulky PDF files is practically impossible, and even if it is possible, it consumes a lot of time.
Need to Compress PDF File and Techniques to Be Followed
In order to make enormous PDF files easily transferable, one has to compress PDF files. Again, compressing PDF files largely depends on the nature of information present in it. The default PDF PDF Setting uses automatic (JPEG) for color and grayscale images, and CCITT Group 4 compression for monochrome images. Down sampling bitmaps and graphics prove to be very helpful in size reduction. This is because in general, images in PDF files are highly pixilated. PDF PDF compression uses bicubic down sampling ranging from 100 to 1200 pixels per inch to compress PDF files. One problem with down sampling is that there is a fear of losing data. Therefore using Zip algorithm is recommended, which is absolutely lossless - it retains all the information without distorting or deleting any bits. Apart from the ones mentioned above, simple steps like dis-embedding fonts, eliminating unwanted elements using PDF optimizers, using the `Save As' command to save files, can help compress PDF file size significantly.
Assets of Compressed PDF Files
Compressed PDF files are small in size and very easy to manage. The files, on compression, are reduced to 1/8th their original size. This facilitates easy sharing, transferring, uploading, and downloading of the files. As attachments, they get attached quickly to mails and thus are sent faster. The quality is maintained on decompressing the file irrespective of how many pixels have been reduced. Hence the user need not worry about the quality. Decompression and compression of PDF files can be carried out to enjoy better file management.