PdfCompressor’s Adjustable Settings
PdfCompressor features a number of options to clean up images. It also offers the thresholding of gray scale and color images—which increases the contrast between foreground and background data—to create optimum bi-tonal files.
MRC involves the seperation of a file into layers before it is compressed. MRC is utilized for achieving maximum compression on color images. MRC separates files into text and graphics layers and then compresses each layer differently.
PdfCompressor includes options for four different compression methods. JPEG and JPEG 2000 compression are available for color or gray scale documents and/or graphic elements of MRC documents. JBIG2 and Group 4 are available for black-and-white documents and/or textual elements of MRC documents.
On the most basic level, you can choose to turn OCR on or off. OCR data does not add much to the file size (maybe 5%), but does slow down the conversion process (see below for details). Up to 117 different languages can be considered when the OCR process is run. PdfCompressor offers four modes of OCR. To help decide which mode is right for your application, the software can produce reports on its confidence level for accuracy on a set of documents running under a specific mode. PdfCompressor also offers data on how long it takes to create a particular type of searchable PDF file.
In CVISION’s testing, PdfCompressor’s output is approximately 40,000 pages per hour per core without OCR and 3,000 pages per hour per core with OCR. PdfCompressor is designed to take full advantage of a quad-core CPU—by enabling each core to individually process pages—so those quoted speeds will quadruple with a quad-core processor. Specific OCR settings will also affect output rates.
PdfCompressor includes a Quick Set Up Wizard that asks a series of questions and uses the answers to automatically suggest your optimum settings. Sample output files are created, along with information on how long it took to produce each sample file. If you are satisfied with one of these samples, the settings can be saved as a profile. If not, the Wizard will ask additional questions and create a new set of samples.