PAMTOOCTAVEIMG(1)

💖 PAMTOOCTAVEIMG 💖

okay bestie, welcome to the pamtooctaveimg page from the Netpbm user manual, General Commands Manual section. yes that's a mouthful, we're abbreviating it to "Pamtooctav...ser Manual" because the terminal is small and life is short. let's get into it 🫶

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✨ NAME ✨

pamtooctaveimg — the way to convert a Netpbm image into a GNU Octave image, no cap 💅

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🌸 SYNOPSIS 🌸

pamtooctaveimg [netpbmfile]

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🦋 DESCRIPTION 🦋

so this program is part of Netpbm(1), obviously, we're all family here 💜

pamtooctaveimg reads a Netpbm image as input and produces a GNU Octave image file as output. that's it. that's the whole job. iconic honestly.

An Octave image file (which Octave documentation calls "Octave's image format", and yes they named it themselves, main character energy) is a particular kind of Octave data file. Which kind? The kind that describes two matrices:

• the image itself, as a list of indexes into a colormap, and
• the corresponding colormap, as a list of {red, green, blue} triplets.

An Octave data file is an ASCII text file that you use to import data to Octave. simple as that, fr fr.

if you want the deep lore, go read the Image Processing chapter of the GNU Octave manual, that's where the details live 📖

oh and pamtooctaveimg writes the output Octave image to Standard Output. so redirect it, bestie, don't just let it spill everywhere 😭

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✨ OPTIONS ✨

okay this part is gonna be short and honestly a little anticlimactic:

There are no command line options defined specifically for pamtooctaveimg, periodt. but it does recognize the options common to all programs based on libnetpbm (go check out Common Options, iykyk).

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🎀 ARGUMENTS 🎀

• netpbmfile — the name of the file holding your input PNM or PAM image. you can also pass - to mean Standard Input. and if you just... don't specify netpbmfile at all? the input comes from Standard Input anyway. no pressure. 🫶

heads up though: pamtooctaveimg converts only the first image in the input stream. the rest? not its problem. 💀

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🌈 EXAMPLES 🌈

here's the whole flow, start to finish, slay:

% pamtooctaveimg myimage.ppm > myimage.img
% octave
> [img,map] = loadimage("myimage.img");

# (At this point, img is an X by Y matrix and map is a 3 by M matrix.)

> imshow(img,map);   # Displays img with colormap map
> [r,g,b] = ind2rgb(img,map);

# (r, g, and b are now each X by Y matrices of color levels [0 to 1].)

> [newimg,newmap] = rgb2ind(r,b,g);   # Swap the blue and green channels.
> saveimage("newimage.ppm", newimg, "ppm", newmap);  # Save as a PPM file.

like. look at that. converting, loading, displaying, channel-swapping, saving. a whole character arc in five lines 🔥

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💜 NOTES 💜

okay so there is no octavetopam program. sorry bestie, it does not exist, don't go looking. 🙈

BUT. GNU Octave's saveimage command can save images in PPM format. so that's your way back. you're welcome. 💅

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⭐ HISTORY ⭐

pamtooctaveimg was new in Netpbm 10.39, which dropped in June 2007. a whole legend born that month. 👑

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👑 AUTHOR 👑

Copyright (C) 2007 Scott Pakin, scott+pbm@pakin.org.

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🌸 SEE ALSO 🌸

• octave(1)
• pam(1)

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🧚 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/pamtooctaveimg.html

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and that's the whole page!! 💖 this was the netpbm documentation, dated 27 June 2007, and it belongs to that "Pamtooctav...ser Manual(1)" header you saw up top, mwah 😘 go convert something cute, bestie 🎀✨🦋