Hospital Alteration Specifications - DjVu / PDF Comparison
This comparison uses a 438-page engineering specification. This is an image-only file (no OCR) with varying page sizes between letter and tabloid, all in black & white. The images used to create this files were 300 dpi TIFF files.
Here is the result in terms of file sizes for this 438-page scanned document:
TIFF File Size: 20.8 MB - Avg. Page Size of 47K
PDF File Size: 21.9 MB - Avg. Page Size of 50K
JBIG2-PDF File Size: 11.2 MB - Avg. Page Size of 39K
DjVu File Size: 11.6 MB - Avg. Page Size of 26K
The DjVu file is half the size of the PDF file.
Open each file using the links below to compare the speed of file display, downloading and page navigation, and print capabilities:
(note: both files will download a-page-at-a-time in the background after the first page is displayed)
DjVu File (11.6 MB) (Indirect) (best for viewing)
JBIG2-Compressed PDF File (11.2 MB) (Optimized)
PDF File (21.9 MB) (Optimized)
Here are a few things you will notice:
1. JBIG2 compression for PDF produces the smallest file size.
1. The DjVu filesdisplays and downloads faster than the PDF files.
2. The Indirect DjVu file downloads page 1 and then waits for you to navigate before downloading additional pages on demand.
3. In the PDF you can navigate pages both vertically and horizontally, while in the DjVu you can only navigate horizontally.
ADDENDUM TO STUDY:
The Image-Only PDF was converted in JRAPublish 1.5 to create a new
OCRed PDF file. The OCRed PDF file size is 28.4 MB.
Then for comparison we also converted the Image-Only PDF file to a OCRed DjVu file. The OCRed file size is 11.9 MB.
OCRed PDF File (28.4 MB) (Optimized)
OCRed DjVu File (11.9 MB) (Indirect) (best for viewing)