TEND-EVECRGB(1)

✨ TEND-EVECRGB ✨

okay bestie come CLOSE because this is the tend subcommand that turns your eigenvectors into a whole RGB situation 💅 it lives in the User Commands section of the manual, and it's called tend-evecrgb 🎀

💖 NAME 💖

tend-evecrgb — make an RGB volume from an eigenvector and an anisotropy 🦋

like, you give it a direction (an eigenvector) and a vibe (an anisotropy), and it hands you back colors. it's giving data visualization but make it fashion ✨

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🌸 SYNOPSIS 🌸

tend evecrgb -c <evec index> -a <aniso> [-t <thresh>] [-bg <background>]
[-gr <gray>] [-gam <gamma>] [-i <nin>] [-o <nout>]

so -c and -a are the mandatory girlies (no defaults, you HAVE to show up), and everything else is optional with sensible defaults already picked out for you 🫶

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👑 OPTIONS 👑

• -c <evec index> — which eigenvector is gonna get the color treatment. it's an unsigned int, and the mapping is:
  • "0" — the principal one, the main character 👑
  • "1" — the middle one
  • "2" — the minor one

pick your fighter, but like, numerically 💀

• -a <aniso> — which anisotropy is modulating the saturation of your colors. important lore: all the Westin metrics come in two versions, so you'll see a 1 and a 2 flavor of basically everything. currently supported:
  • "cl1", "cl2" — Westin's linear
  • "cp1", "cp2" — Westin's planar
  • "ca1", "ca2" — Westin's linear + planar
  • "cs1", "cs2" — Westin's spherical
  • "ct1", "ct2" — GK's anisotropy type (cp/ca)
  • "ra" — Basser/Pierpaoli relative anisotropy/sqrt(2)
  • "fa" — Basser/Pierpaoli fractional anisotropy
  • "vf" — volume fraction = 1-(Basser/Pierpaoli volume ratio)
  • "tr" — trace

that's the whole menu, no cap 🌈

• -t <thresh> — confidence threshold, a float. default: "0.5" ⭐
• -bg <background> — the gray level to use for voxels whose confidence is zero. it's a double. default: "0" 💤
• -gr <gray> — the gray level to desaturate towards as anisotropy decreases (while confidence stays at 1.0, just to be clear). double. default: "0" 🌫️
• -gam <gamma> — gamma to use on the color components. double. default: "1" ✨
• -i <nin> — the input diffusion tensor volume. default: "-" 🍓
• -o <nout> — the output image, and heads up it's floating point, and it's a string. default: "-" 💾

okay so real talk, - as a default for both -i and -o means stdin/stdout energy, so this whole thing can live in a pipeline if that's your moment 🧚

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🔥 SEE ALSO 🔥

• tend(1)

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that's the whole page, bestie, you ate it 💜

this one's from April 2021, out of the User Commands manual section — shoutout to that era of the docs 🎀 bye bestie, go color some voxels 🌈✨💅