Linux cli command ppmmix

➡ 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 ppmmix and provides detailed information about the command ppmmix, 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 ppmmix.

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NAME 🖥️ ppmmix 🖥️

blend together two PPM images

SYNOPSIS

ppmmix fadefactor ppmfile1 ppmfile2

DESCRIPTION

This program is part of Netpbm(1) .

ppmmix reads two PPM images as input and mixes them together using the specified fade factor. The fade factor may be in the range from 0.0 (only ppmfile1’s image data) to 1.0 (only ppmfile2’s image data). Anything in between specifies a smooth blend between the two images.

The two images must have the same dimensions and the same maxval. Before Netpbm 10.54 (March 2011), they must also have the same type (PBM/PGM/PPM).

The fade factor is applied to brightness, not light intensity. That means for example that if you have a series of images you generated using ppmmix of a black and a white image with a linearly increasing fade factor, you will see an image getting linearly brighter, but the light intensity will increase faster at the end. That is because it requires more intensity change at the bright end of the scale than at the dark end for the human eye to perceive the same brightness change. This also means that if the original images aren’t all one color, the mixed image is distorted, since the intensity relationship between pixels is different from the original image.

pamcomp is a more general alternative. It allows you to mix images of different size and to have the fade factor vary throughout the image (through the use of a transparency mask). It does not have the same-maxval and same-type restrictions. It mixes light intensity, not brightness.

OPTIONS

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

SEE ALSO

pamcomp(1) , pammixmulti(1) , ppm(1)

AUTHOR

Copyright (C) 1993 by Frank Neumann

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/ppmmix.html

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