i.his.rgb(1grass)

💖 i.his.rgb — the grass manual page, but make it cute ✨

okay bestie, so this is i.his.rgb from the GRASS User's Manual and it is literally the glow-up module. It takes your HIS (Hue-Intensity-Saturation) color space and transforms it into RGB (Red-Green-Blue). it's giving color alchemy. 🎀

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✨ NAME ✨

i.his.rgb — transforms raster maps from HIS (Hue-Intensity-Saturation) color space to RGB (Red-Green-Blue) color space. no cap, that's the whole job and she does it flawlessly. 💅

🌈 KEYWORDS 🌈

imagery, color transformation, RGB, HIS, IHS

👑 SYNOPSIS 👑

i.his.rgb
i.his.rgb --help
i.his.rgb hue=name intensity=name saturation=name red=name green=name
blue=name  [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

🚩 Flags

• --overwrite — lets your output files just bulldoze right over existing files. yes queen, overwrite. 💀
• --help — prints the usage summary so you're not out here guessing.
• --verbose — verbose module output, aka she tells you everything.
• --quiet — quiet module output, aka she says nothing, she just works.
• --ui — forces the GUI dialog to launch. main character energy only.

🧚 Parameters

• hue=name [required] — Name of input raster map (hue).
• intensity=name [required] — Name of input raster map (intensity).
• saturation=name [required] — Name of input raster map (saturation).
• red=name [required] — Name for output raster map (red).
• green=name [required] — Name for output raster map (green).
• blue=name [required] — Name for output raster map (blue).

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🌸 DESCRIPTION 🌸

So i.his.rgb is an image processing program, right? She takes three input raster map layers — your hue, your intensity, your saturation — and she produces three output raster map layers representing the red, green and blue components of that data. ✨

The output raster map layers? Created by a standard hue-intensity-saturation (HIS) to red-green-blue (RGB) color transformation. periodt. 💖

Each output raster map layer gets handed a linear gray scale color table. And yes, the current geographic region and mask settings are respected — she's polite like that, she stays in her lane. 🦋

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🔥 NOTES 🔥

okay so real talk, listen up because this part matters:

It is not possible to process three bands with i.his.rgb and then exactly recover the original bands with i.rgb.his. 💀

Why? Loss of precision — because of integer computations and rounding. The math is doing math things, bestie.

Tests have shown that more than 70% of the original cell values will be reproduced exactly after transformation in both directions, and that 99% will be within plus or minus 1. A few cell values may differ significantly from their original values. 😭

so like… mostly slay, a lil chaotic at the edges. iykyk.

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💜 SEE ALSO 💜

• i.rgb.his
• r.colors

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🫶 AUTHOR 🫶

David Satnik, GIS Laboratory, Central Washington University

with acknowledgements to Ali Vali, Univ. of Texas Space Research Center, for the core routine. 🎀

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⭐ SOURCE CODE ⭐

Available at: i.his.rgb source code (history)

Latest change: Friday Feb 07 19:16:09 2025 in commit: a82a39f673b97fafcfce1604dc3e6015cb96487a

Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index

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and that's the whole page, bestie! 🎉 this was i.his.rgb from the GRASS User's Manual, running on GRASS 8.5.0 — © 2003-2026 GRASS Development Team, GRASS 8.5.0 Reference Manual. obsessed with her, fr fr. 💖✨👑