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Test Your Knowledge in Computers #825
Difficulty: Medium
The term API seems to appear for the first time in the article of Ira W. Cotton, Data structures and techniques for remote computer graphics, published in 1968.
True or False?
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ppm3d(1) [redhat man page]

ppm3d(1)						      General Commands Manual							  ppm3d(1)

ppm3d - convert two portable pixmap into a red/blue 3d glasses pixmap SYNOPSIS
ppm3d leftppmfile rightppmfile [horizontal_offset] DESCRIPTION
Reads two portable pixmaps as input. Produces a portable pixmap as output, with the images overlapping by horizontal_offset pixels in blue/red format. horizontal_offset defaults to 30 pixels. Pixmaps MUST be the same size. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1993 by David K. Drum. 2 November 1993 ppm3d(1)

Check Out this Related Man Page

pnmhistmap(1)						      General Commands Manual						     pnmhistmap(1)

pnmhistmap - draw a histogram for a PGM or PPM file SYNOPSIS
pnmhistmap [-black] [-white] [-max N] [-verbose] [pnmfile] DESCRIPTION
Reads a portable anymap as input, although bitmap (PBM) input produces an error message and no image. Produces an image showing a his- togram of the color (or gray) values in the input. A graymap (PGM) input produces a bitmap output. A pixmap (PPM) input produces pixmap output with three overlaid histograms: a red one for the red input, a green one for the green input, and a blue one for the blue input. The output is fixed in size: 256 pixels wide by 200 pixels high. OPTIONS
-black Ignores the count of black pixels when scaling the histogram. -white Ignores the count of white pixels when scaling the histogram. The -black and -white options, which can be used seperately or together, are useful for images with a large percentage of pixels whose value is zero or 255, which can cause the remaining histogram data to become unreadbaly small. Note that, for pixmap inputs, these options apply to all colors; if, for example, the input has a large number of bright-red areas, you will probably want to use the -white option. -max N Force the scaling of the histogram to use N as the largest-count value. This is useful for inputs with a large percentage of sin- gle-color pixels which are not black or white. -verbose Report the progress of making the histogram, including the largest-count value used to scale the output. All flags can be abbreviated to their shortest unique prefix. BUGS
Assumes maxval is always 255. Images with a smaller maxval will only use the lower-value side of the histogram. This can be overcome either by piping the input through "pnmdepth 255" or by cutting and scaling the lower-value side of the histogram. Neither is a particu- larly elegant solution. Should allow the output size to be specified. SEE ALSO
pgmhist(1), ppmhist(1), pgm(5), ppm(5) AUTHOR
Wilson H. Bent. Jr. ( 25 October 1993 pnmhistmap(1)

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