Linux cli command pgmdeshadow

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command pgmdeshadow and provides detailed information about the command pgmdeshadow, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the pgmdeshadow.

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NAME 🖥️ pgmdeshadow 🖥️

Deshadow a PGM image

SYNOPSIS

pgmdeshadow

[pnmfile]

DESCRIPTION

This program is part of Netpbm(1) .

pgmdeshadow removes gray shadows from an image. This is useful for an image containing text, such as a scanned book pages, where a shadow typically appears near the book crease or near one side of the image. pgmdeshadow recognizes a gray shadow as an area of smoothly changing color, starting from the outer edges of the image. The program uses a simple image reconstruction algorithm to determine the local shadow gray level, then divides each pixel’s gray level by the local shadow gray level.

The algorithm is the “fast hybrid grayscale reruction” algorithm from Luc Vincent, “Morphological Grayscale Reruction in Image Analysis: Applications and Efficient Algorithms.

OPTIONS

There are no command line options defined specifically for pgmdeshadow, but it recognizes the options common to all programs based on libnetpbm (See Common Options .)

REFERENCES

  • Luc Vincent, “Morphological Grayscale Reconstruction in Image Analysis: Applications and Efficient Algorithms,” IEEE Transactions on Image Processing, vol. 2, no. 2, April 1993, pp. 176-201.

SEE ALSO

ppmshadow(1) , pgm(1)

HISTORY

pgmdeshadow was added to Netpbm in Version 10.35 (August 2006).

DOCUMENT SOURCE

This manual page was generated by the Netpbm tool ‘makeman’ from HTML source. The master documentation is at

http://netpbm.sourceforge.net/doc/pgmdeshadow.html

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