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Getting Started:
    1. Windows
  Text Menu
  (now with video!)
  2. Linux
  Env vars
  3. Mac OSX
  4. Help in other languages

FAQ | Forum

Customizing K2PDFOPT:
    1. K2pdfopt GUIs
    2. Disabling the Windows GUI
    3. The interactive menu
    4. List of command-line options
    5. Using a shortcut
  (now with video!)
  6. Using the K2PDFOPT environment variable
  7. Using the command line

Adjusting the output:
    1. Screen Size
    2. Increasing the magnification
    3. Landscape mode
    4. Output File Size
    5. Setting Margins
    6. Color Output
    7. Uneven Line Breaks/ Excess Margins

Processing Options:
    1. Showing Markings
    2. OCR
    3. Native PDF
  (now with video!)
    4. Auto-Straightening
    5. Ignoring Borders/ Headers/Footers
    6. Detecting Columns
    7. Protecting Regions
    8. Column Order
    9. Right-to-Left Page Scanning
    10. Using Ghostscript
NOTE: In v1.60, -dpi is preferred to -odpi, but both will work. In v1.51, the DPI settings in the interactive menu are now under option "d" for "device resolution".

While k2pdfopt is designed to give good results on a 6-inch reader by default, you may want to fine tune the DPI settings depending on your reader and your input file. The -idpi and -odpi settings, discussed above, control the quality (-idpi) and magnification (-odpi) of the k2pdfopt output PDF file. DPI stands for dots per inch, and -idpi tells k2pdfopt what dots per inch, or resolution, to use for rendering the source (input) PDF file, while -odpi tells k2pdfopt the dots per inch of the output device (the reader screen). Here is an example of the effect of each. The original PDF file is an 8.5 x 11-inch page like so:

(source file, 8.5 x 11 inches)

Examples of the first page of the output file with different -odpi values are shown below. This directly controls the magnification of the output file. Larger values increase the magnification proportionately.

-odpi 50
-odpi 167 (default)
-odpi 300

Output DPI control in Windows GUI

Examples of the first page of the output file with different -idpi (at -odpi 167) are shown below. You can see that it only affects the quality of the output, not the magnification. In general, you don't need to worry about the -idpi value because as of v1.29, it defaults to twice the -odpi value, which should be fine for any conversion.

-idpi 50
-idpi 150
-idpi -2 (default = 2 x the output dpi)


This page last modified
Sunday, 28-May-2017 10:09:24 PDT