An image or full image-based PDF document, e.g., a scanned PDF, will gain around a 50% reduction based on default contentCrawler Compression settings. However, a number of factors can play a part in how a document compresses:
• Greater compression is gained if the original image or PDF has very high DPI (Dots Per Inch)
• Lesser compression may occur if OCR is performed where the original file size is small, as OCR adds to the overall file size due to the addition of font dictionaries
• Lesser compression occurs if the original file already has JPEG2000 or JBIG2 compression or MRC compression
• Lesser compression occurs if the original PDF contains a mixture of text and image pages