PPMTOYUVSPLIT(1)

📦
version 11.13.03 · 3 versions
, in debian bookworm, debian trixie, ubuntu noble, ubuntu resolute, ubuntu stonking

💖 ppmtoyuvsplit — the user manual, but make it cute ✨

okay bestie, gather round, because today we're talking about ppmtoyuvsplit from the Netpbm family, and it's lowkey iconic. it's a General Commands Manual page, and yes, it's giving "niche but powerful." 🎀

✨ NAME ✨

ppmtoyuvsplit — convert a PPM image to 3 subsampled raw YUV files 🦋

🌸 SYNOPSIS 🌸

ppmtoyuvsplit basename [ppmfile]

like… that's it. that's the whole summoning ritual. basename is required, ppmfile is optional, and she'll tell you why in a sec. 💅

💜 DESCRIPTION 💜

so first things first: this program is part of Netpbm(1). family reunion, everyone's here. 🌈

Here's the tea: ppmtoyuvsplit reads a PPM image as input. then it produces 3 raw files as output, and their names are:

  • basename.Y
  • basename.U
  • basename.V

(so if you ran it with basename cutie, you'd get cutie.Y, cutie.U, and cutie.V. not me naming my files like that. 🙈)

These output files are the subsampled raw YUV representation of the input PPM image — exactly as required by the Stanford MPEG codec. it's giving "very specific audience, but they're obsessed." 👑

Now the details, because the details are everything:

  • The Y output file contains a byte for each pixel in the image. the rows go from top to bottom, and the columns within each row go left to right. very orderly, very booktok organized. 📚
  • The U and V output files are arranged similarly… except each byte represents a square of 4 pixels of the image. and that byte's value is the arithmetic mean of the value of each of those 4 pixels. math girlies rise up. 🧮✨
  • Hence (yes, hence, we're being fancy): the Y file is 4 times the size of the U file or the V file. four whole times. 😭

And the YUV values are scaled according to CCIR.601, as assumed by MPEG. no cap. that's the standard and she's sticking to it. 💀

🎀 OPTIONS 🎀

plot twist: there are no command line options defined specifically for ppmtoyuvsplit. nope. none. she's a simple girl. 🙈

BUT — she does recognize the options common to all programs based on libnetpbm. so if you wanna know those, go check out Common Options. iykyk. 💅

👀 SEE ALSO 👀

the whole friendship group, obviously:

go say hi, they don't bite. 🫶

🌟 AUTHOR 🌟

Copyright (C) 1993 by Andre Beck. (Andre_Beck@IRS.Inf.TU-Dresden.de) — legend behavior, honestly. 👑

Based on ppmtoyuv.c. 🍓

📜 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/ppmtoyuvsplit.html
⚠️ friendly reminder bestie: this whole page is netpbm documentation, dated 06 March 2003, and it's the user manual for Ppmtoyuvsp... (aka ppmtoyuvsplit) in section 1. that's the vibe. that's the source. periodt. 💖

now go forth and split those YUVs, you main character. 🦋✨

📦 where this page comes from