Mixbox is a pigment mixing black-box. You pass RGB colors in and get the mixed RGB out. Internally, Mixbox treats the colors as if they were made of actual real-world pigments. It uses the Kubelka & Munk theory to predict the color of the resulting mixture. This way, Mixbox achieves that blue and yellow mix to green, the same way real pigments do.
- Paper: https://scrtwpns.com/mixbox.pdf
- Video: https://youtu.be/ATzVPVNp1qA
- Talk: https://youtu.be/_qa5iWdfNKg
Mixbox is shipping in the upcoming Rebelle 5 as the Rebelle Pigments feature.
The simplest way to use Mixbox is with the lerp interface:
#include <stdio.h>
#include "mixbox.h"
int main()
{
unsigned char r1=252, g1=211, b1=0; // bright yellow
unsigned char r2=0, g2=0, b2=96; // deep blue
float t = 0.5;
unsigned char r,g,b;
mixbox_lerp_srgb8(r1,g1,b1, // first color
r2,g2,b2, // second color
t, // mixing ratio
&r,&g,&b); // result
printf("%d %d %d\n",r,g,b);
}
Alternatively, one can use the latent interface. This allows mixing multiple RGB colors at once using arbitrary weights:
float latent1[MIXBOX_NUMLATENTS];
float latent2[MIXBOX_NUMLATENTS];
float latentMix[MIXBOX_NUMLATENTS];
mixbox_srgb8_to_latent(r1,g1,b1,latent1);
mixbox_srgb8_to_latent(r2,g2,b2,latent2);
for(int i=0;i<MIXBOX_NUMLATENTS;i++)
{
latentMix[i] = (1.0f-t)*latent1[i] + t*latent2[i];
}
mixbox_latent_to_srgb8(latentMix,&r,&g,&b);
Copyright (c) 2021, Secret Weapons. All rights reserved.
This code is for non-commercial use only. It is provided for research and evaluation purposes.
If you wish to obtain commercial license, please contact: mixbox@scrtwpns.com