PPMDITHER(1)

✨ NAME ✨

ppmdither — ordered dithering but make it fashion 💅 for color images

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🌸 SYNOPSIS 🌸

ppmdither

[-dim=power]

[-red=n]

[-green=n]

[-blue=n]

[netpbmfile]

okay bestie, quick housekeeping before we start 🫶

• Every option can be shortened to its shortest unique prefix — no need to type the whole thing, she's not gonna make you.
• You can use two hyphens instead of one if that's your vibe.
• Between an option name and its value you can put either white space or an equals sign — both slay.

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🦋 DESCRIPTION 🦋

This program is part of Netpbm(1). Iconic family, no notes. 👑

ppmdither reads a Netpbm image as input and applies dithering to it, reducing the number of colors down to however many shades you asked for for each primary. Out comes a PPM image. That's the whole glow-up. ✨

The default number of shades is 5 red, 9 green, and 5 blue — that's 225 colors total, for real. And if your goal is converting an image into a binary rgb format that plays nice with primitive color printers? Say less: use -red=2 -green=2 -blue=2 and you're done. 🖨️

And listen — if you want a different kind of dither, the Floyd-Steinberg kind, you can get that with pnmquant or pnmremap. Different tool, different serve. 💁‍♀️

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💖 OPTIONS 💖

On top of the options that are common to all programs based on libnetpbm — most notably -quiet, peep the Common Options section — ppmdither also recognizes these command line options:

• -dim power — the size of the dithering matrix. The matrix is a square whose dimension is a power of 2, and power is literally that power of 2. Default is 4, which gives you a 16 by 16 matrix. it's giving math but cute 🎀
• -red=n — the number of red shades to use, including black. Minimum of 2. Default is 5.
• -green n — the number of green shades to use, including black. Minimum of 2. Default is 9.
• -blue n — the number of blue shades to use, including black. Minimum of 2. Default is 5.

heads up bestie: that "including black" thing applies to -red, -green, AND -blue. so like, 2 is the floor for each of them. don't come for me. 💀

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👀 SEE ALSO 👀

pamditherbw(1), pamdepth(1), pnmquant(1), pnmremap(1), ppm(1)

the whole friend group honestly, all of them ate 🫶

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🎀 AUTHOR 🎀

Copyright (C) 1991 by Christos Zoulas.

periodt. 💜

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📖 DOCUMENT SOURCE 📖

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

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

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okay and that's a wrap on the Ppmdither User Manual from the General Commands Manual section, brought to you by netpbm documentation, dated 16 December 2009. ✨ go dither something gorgeous, bestie 🌸🦋💖