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Overview
| Comment: | pixel_robot: Handle OKLCH color mixing. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
7808fe33aa1aba3620ba27c560d284f6 |
| User & Date: | andy 2025-05-01 23:37:59 |
Context
|
2025-05-01
| ||
| 23:38 | pixel_robot: Added OKLAB/OKLCH to documentation. check-in: c18fdb3fc6 user: andy tags: trunk | |
| 23:37 | pixel_robot: Handle OKLCH color mixing. check-in: 7808fe33aa user: andy tags: trunk | |
|
2025-04-30
| ||
| 16:03 | pixel_robot: Added missing code for OKLAB/OKLCH color distance and similarity. check-in: dd8aeb171c user: andy tags: trunk | |
Changes
Changes to pixel_robot/include/pixel_robot/rgb_color.hpp.
| ︙ | ︙ | |||
369 370 371 372 373 374 375 376 377 378 379 380 381 382 |
float x, y, z;
float sx = 0, sy = 0, sz = 0;
auto to_xyz =
[space](rgb_color c, float &x, float& y, float &z) -> void
{
float h, s, lv;
c.to_color_space(space, h, s, lv);
x = s * std::cos( 2 * 3.14159f * h / 360.0f );
y = s * std::sin( 2 * 3.14159f * h / 360.0f );
z = lv;
};
| > | 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 |
float x, y, z;
float sx = 0, sy = 0, sz = 0;
auto to_xyz =
[space](rgb_color c, float &x, float& y, float &z) -> void
{
float h, s, lv;
// `space` will be HSL or HSV
c.to_color_space(space, h, s, lv);
x = s * std::cos( 2 * 3.14159f * h / 360.0f );
y = s * std::sin( 2 * 3.14159f * h / 360.0f );
z = lv;
};
|
| ︙ | ︙ | |||
400 401 402 403 404 405 406 407 408 409 410 411 412 413 |
h = 360 * h / (2 * 3.14159);
float s = std::sqrt(sx*sx + sy*sy);
float lv = sz;
return rgb_color::from_color_space(space, h, s, lv);
}
else {
// For other color spaces its sufficient to convert into the
// color space, compute the average there, and then convert
// back to RGB space at the end.
float sx = 0, sy = 0, sz = 0;
float x, y, z;
| > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 |
h = 360 * h / (2 * 3.14159);
float s = std::sqrt(sx*sx + sy*sy);
float lv = sz;
return rgb_color::from_color_space(space, h, s, lv);
}
else if(space == color_space::OKLCH) {
// We have to do the same thing for OKLCH, as it's a cylindrical
// color space like HSL/HSV.
float x, y, z;
float sx = 0, sy = 0, sz = 0;
auto to_xyz =
[](rgb_color c, float &x, float& y, float &z) -> void
{
float OK_L, OK_c, OK_h;
c.to_color_space(OKLCH, OK_L, OK_c, OK_h);
x = OK_c * std::cos( 2 * 3.14159f * OK_h / 360.0f );
y = OK_c * std::sin( 2 * 3.14159f * OK_h / 360.0f );
z = OK_L;
};
(
( to_xyz(colors, x, y, z),
sx += x,
sy += y,
sz += z
),
...
);
// Average
sx /= sizeof...(colors);
sy /= sizeof...(colors);
sz /= sizeof...(colors);
// Convert back to OKLCH
float OK_h = std::fmod( std::atan2(sy, sx) + 2 * 3.14159 , 2 * 3.14159) ;
OK_h = 360 * OK_h / (2 * 3.14159);
float OK_c = std::sqrt(sx*sx + sy*sy);
float OK_L = sz;
return rgb_color::from_color_space(OKLCH, OK_L, OK_c, OK_h);
}
else {
// For other color spaces its sufficient to convert into the
// color space, compute the average there, and then convert
// back to RGB space at the end.
float sx = 0, sy = 0, sz = 0;
float x, y, z;
|
| ︙ | ︙ |