Is your feature request related to a problem? Please describe.
Add options for color code systems like RAL (standard in Europe), Federal Standard 595C colour range (standard in the US)
Describe the solution you'd like
- Set a database of correspondance between codes: RAL or FS595C <-> RGB or HEX or CIELAB
The model of conversion could be based e.g. on CIELAB -> RAL (Classic or design ...) using this website: https://convertingcolors.com/ral-colors.html
- Color Matching Algorithms:
Color conversion between systems like RGB/HEX and RAL or FS595C is typically done through color-matching algorithms, which compare the input color to a database of standard colors and return the closest match. This can be achieved by:
- Euclidean Distance in Color Space: Calculate the distance between the input color in RGB or another color space (e.g., Lab) and the colors in the RAL or FS595C database. Formula for Euclidean distance in RGB:
$$
\text{Distance}_{RGB} = \sqrt{(R_1 - R_2)^2 + (G_1 - G_2)^2 + (B_1 - B_2)^2}
$$
- More accurate matches are obtained using the CIE Lab color space (that Eyedropper already provides), as it models human perception better:
$$
\Delta E_{76} = \sqrt{(L_1 - L_2)^2 + (a_1 - a_2)^2 + (b_1 - b_2)^2}
$$
Delta E (CIEDE2000): A perceptual metric used for assessing color differences, which is more complex but provides more reliable results than Euclidean distance:
$$
\Delta E_{00} = \sqrt{ \left( \frac{\Delta L'}{k_L S_L} \right)^2 + \left( \frac{\Delta C'}{k_C S_C} \right)^2 + \left( \frac{\Delta H'}{k_H S_H} \right)^2 + R_T \frac{\Delta C'}{k_C S_C} \frac{\Delta H'}{k_H S_H} }
$$
- There are software tools and APIs available for this task:
Open-source libraries: Some libraries in Python (e.g., colormath, Pillow) can help convert colors between RGB, Lab, and other spaces, making it easier to calculate the nearest match.
Describe alternatives you've considered
#NA
Additional context
#NA
Is your feature request related to a problem? Please describe.
Add options for color code systems like RAL (standard in Europe), Federal Standard 595C colour range (standard in the US)
Describe the solution you'd like
The model of conversion could be based e.g. on CIELAB -> RAL (Classic or design ...) using this website: https://convertingcolors.com/ral-colors.html
Color conversion between systems like RGB/HEX and RAL or FS595C is typically done through color-matching algorithms, which compare the input color to a database of standard colors and return the closest match. This can be achieved by:
Delta E (CIEDE2000): A perceptual metric used for assessing color differences, which is more complex but provides more reliable results than Euclidean distance:
Open-source libraries: Some libraries in Python (e.g., colormath, Pillow) can help convert colors between RGB, Lab, and other spaces, making it easier to calculate the nearest match.
Describe alternatives you've considered
#NA
Additional context
#NA