![]() I read that GIMP uses D50 in this post, so I may be using the wrong matrix. I used D65 matrix to convert BGR to XYZ, without rescaling XYZ values. Here is what I have managed so far: XYZ_MAT = np.array( I have even downloaded the source code of GIMP and tried to find the code for conversion by searching the files, but there are way too many files and I failed to find the code for conversion. I learned that there are many specifications of LCh and I want the output of my code to agree with GIMP, because I use GIMP. Return to_BGR(hsl, HSV_to_BGR(hsv: np.ndarray) -> np.ndarray:īut I have failed to find the formula GIMP uses for the conversion. Return BGR_from_HSV_pixel(h, s, v) if s else (v, v, HSL_to_BGR(hsl: np.ndarray) -> np.ndarray: Return BGR_from_HSL_pixel(h, s, l) if s else (l, l, HSV_short(h: float, s: float, v: float) -> Tuple: Return v - a * HSV_helper(h, 1), v - a * HSV_helper(h, 3), v - a * HSV_helper(h, HSL_short(h: float, s: float, l: float) -> Tuple: Return max(0, min(k, 4 - k, fastmath=True)ĭef BGR_from_HSV_pixel(h: float, s: float, v: float): Return l - a * HSL_helper(h, 4), l - a * HSL_helper(h, 8), l - a * HSL_helper(h, fastmath=True)ĭef HSV_helper(h: float, n: float) -> float: Return max(-1, min(k - 3, 9 - k, fastmath=True)ĭef BGR_from_HSL_pixel(h: float, s: float, l: float): ![]() Return from_BGR(img, BGR_to_HSV(img: np.ndarray) -> np.ndarray:ĭef to_BGR(val: np.ndarray, mode: Callable) -> np.ndarray:ĭef HSL_helper(h: float, n: float) -> float: Return BGR_to_HSL(img: np.ndarray) -> np.ndarray: Return (hue(b, g, r, d, i), d / z, z) if d else (0, 0, parallel=True)ĭef from_BGR(img: np.ndarray, mode: Callable) -> np.ndarray: Return (hue(b, g, r, d, i), d / (1 - abs(s - 1)), avg) if d else (0, 0, fastmath=True) I have written Python implementations to convert BGR to HSV/HSL and back using information from Wikipedia: import numba as nbįrom typing import Callable, fastmath=True)ĭef extrema(a: float, b: float, c: float) -> Tuple:ĭef hue(b: float, g: float, r: float, d: float, i: float) -> float:ī: float, g: float, r: float, i: float, x: float, z: float The values in my input arrays are scaled down to 0 to 1, and I want the output values to be the same. I want to do this without using any color conversion libraries, and I want to convert BGR float arrays to LCh arrays. I want to convert from RGB to LCh and back, as a programming challenge. I am extremely intelligent and very experienced in Python and currently learning C++. It is characterized by a noticeable limp or. Anyway I am a programming enthusiast and this is my Stack Overflow profile, and my Code Review profile. Gimp is a term used to describe a physical disability that affects a persons ability to walk. Don’t know if this is the right place to ask.
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