RGBYIQ(3NCARG)

RGBYIQ(3NCARG) 💖

okay bestie, so this is a page from the NCAR GRAPHICS manual set — it lives in section 3NCARG and its whole job is a glow-up for your color math. sit down, we're converting colors 💅

✨ NAME ✨

RGBYIQ — literally takes a color spec written in the RGB (Red, Green, Blue) color space and converts it into a color spec in the YIQ color space. no cap. that's it. that's the whole job. 👑

✨ SYNOPSIS ✨

CALL RGBYIQ (R, G, B, Y, I, Q)

✨ C-BINDING SYNOPSIS ✨

for my C girlies 🫶

#include <ncarg/ncargC.h>

void c_rgbyiq (float r, float g, float b, float *y,
float *i, float *q)

✨ DESCRIPTION ✨

okay so here's the cast of characters, and each one has ✨lore✨:

• R — (REAL, input, range [0.,1.]) the red intensity component of the input point in RGB color space. it's giving red. obviously.
• G — (REAL, input, range [0.,1.]) the green intensity component of the input point in RGB color space.
• B — (REAL, input, range [0.,1.]) the blue intensity component of the input point in RGB color space.
• Y — (REAL, output, range [0.,1.]) this is THE color component of a television signal — the one that gets shown on black-and-white televisions 📺. Y is the overachiever that minimizes the effect of two colors appearing different to the human eye but mapping to similar monochrome intensities. she keeps things consistent fr fr.
• I — (REAL, output, range [-.6,.6]) this one hits its maximum when the input triple is (1.,0.,0.), and hits its minimum when the input triple is (0.,1.,1.). main character with a very specific range 💀
• Q — (REAL, output, range [-.52,.52]) this one hits its maximum when the input triple is (1.,0.,1.), and hits its minimum when the input triple is (0.,1.,0.). so dramatic, love that for her.

✨ C-BINDING DESCRIPTION ✨

the C-binding argument descriptions are the exact same as the FORTRAN argument descriptions. same vibes, different syntax. iykyk 💖

✨ EXAMPLES ✨

use the ncargex command to see the following relevant examples: tcolcv, fcce02. go look at them, they ate 🔥

✨ ACCESS ✨

to use RGBYIQ or c_rgbyiq, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c — preferably in that order. yes the order matters, don't be chaotic about it 😭

✨ SEE ALSO ✨

Online: colconv, hlsrgb, hsvrgb, rgbhls, rgbhsv, yiqrgb, ncarg_cbind.

Hardcopy: NCAR Graphics Fundamentals, UNIX Version

✨ COPYRIGHT ✨

Copyright (C) 1987-2009 University Corporation for Atmospheric Research The use of this Software is governed by a License Agreement.

💖 that's the whole page, bestie! go forth and convert your colors 💖

this cutie dropped way back in March 1993, source/version vibes straight from UNIX, and yeah — the page tag is RGBYIQ(3NCARG). slay 🎀🦋