i.rgb.his(1grass)

💖 i.rgb.his — the GRASS User's Manual glow-up 💖

okay bestie, gather round, because this is <rainbow>i.rgb.his</rainbow> from the GRASS User's Manual and she is literally the color-space glow-up queen ✨

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🌈 NAME 🌈

i.rgb.his — she takes raster maps and flips them from RGB (Red-Green-Blue) color space all the way over to HIS (Hue-Intensity-Saturation) color space. it's giving transformation, no cap 💅

🏷️ KEYWORDS 🏷️

imagery, color transformation, RGB, HIS, IHS 🌸

✨ SYNOPSIS ✨

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

🎀 Flags: 🎀

• --overwrite — lets your output files bulldoze over existing files, periodt. if you don't pass this, she will NOT be overwriting anything for you 💀
• --help — prints the usage summary, aka the "what does this even do" cheat sheet 🫶
• --verbose — verbose module output, for when you want the full tea ☕
• --quiet — quiet module output, for when you want her to just do the thing and stop yapping 🤫
• --ui — forces the GUI dialog to launch. main character GUI energy 👑

🌸 Parameters: 🌸

• red=name [required] — name of the input raster map (red) 🍓
• green=name [required] — name of the input raster map (green) 🧚
• blue=name [required] — name of the input raster map (blue) 🦋
• hue=name [required] — name you're giving the output raster map (hue) 💜
• intensity=name [required] — name you're giving the output raster map (intensity) ⭐
• saturation=name [required] — name you're giving the output raster map (saturation) 🎀

lowkey important: those last six? every single one of them is required. no optional vibes here, she needs all six names before she'll lift a finger 🙈

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💅 DESCRIPTION 💅

i.rgb.his is an image processing program, and the way she works is so clean: she takes three input raster map layers — your red, your green, and your blue components — and produces three output raster map layers that represent the hue, the intensity, and the saturation of the data. slay 💖

those output raster map layers get created by a standard red-green-blue (RGB) to hue-intensity-saturation (HIS) color transformation. it's textbook, it's iconic, it's fr fr the classic move 🔥

and then — cute detail — each output raster map layer gets handed a linear gray scale color table. not me giving them all the same fit 😭

she also respects the current geographic region definition and mask settings. so whatever your region and mask are set to? she's honoring them, always, periodt 🫶

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👀 SEE ALSO 👀

• i.his.rgb — the reverse glow-up, go check her out too

👑 AUTHOR 👑

David Satnik, GIS Laboratory, Central Washington University — with acknowledgements to Ali Vali, Space Research Center, for the core routine. legends only, honestly 🌟

📜 SOURCE CODE 📜

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

Latest change: Saturday May 31 03:33:38 2025 in commit: 193579448e84c26e98f04e97918b6c61d5a2adff

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

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and that's the whole page bestie, we ate and left no crumbs 🍓✨

© 2003-2026 GRASS Development Team, GRASS 8.5.0 Reference Manual — this was i.rgb.his(1grass) at the top and GRASS 8.5.0 at the bottom, so consider yourself fully caught up 💖 mwah 💅