The question asks how to generate a CSS filter to transform black into a given target color using only CSS filters.
One possible method is to use the following formula:
filter: invert(100%) sepia() saturate(10000%) hue-rotate(0deg)
This will transform black into the given target color.
An alternative method that is more efficient and accurate is to use the following code:
<code class="javascript">class Color { constructor(r, g, b) { this.set(r, g, b); } toString() { return `rgb(${Math.round(this.r)}, ${Math.round(this.g)}, ${Math.round(this.b)})`; } set(r, g, b) { this.r = this.clamp(r); this.g = this.clamp(g); this.b = this.clamp(b); } hueRotate(angle = 0) { angle = angle / 180 * Math.PI; let sin = Math.sin(angle); let cos = Math.cos(angle); this.multiply([ 0.213 + cos * 0.787 - sin * 0.213, 0.715 - cos * 0.715 - sin * 0.715, 0.072 - cos * 0.072 + sin * 0.928, 0.213 - cos * 0.213 + sin * 0.143, 0.715 + cos * 0.285 + sin * 0.140, 0.072 - cos * 0.072 - sin * 0.283, 0.213 - cos * 0.213 - sin * 0.787, 0.715 - cos * 0.715 + sin * 0.715, 0.072 + cos * 0.928 + sin * 0.072 ]); } grayscale(value = 1) { this.multiply([ 0.2126 + 0.7874 * (1 - value), 0.7152 - 0.7152 * (1 - value), 0.0722 - 0.0722 * (1 - value), 0.2126 - 0.2126 * (1 - value), 0.7152 + 0.2848 * (1 - value), 0.0722 - 0.0722 * (1 - value), 0.2126 - 0.2126 * (1 - value), 0.7152 - 0.7152 * (1 - value), 0.0722 + 0.9278 * (1 - value) ]); } sepia(value = 1) { this.multiply([ 0.393 + 0.607 * (1 - value), 0.769 - 0.769 * (1 - value), 0.189 - 0.189 * (1 - value), 0.349 - 0.349 * (1 - value), 0.686 + 0.314 * (1 - value), 0.168 - 0.168 * (1 - value), 0.272 - 0.272 * (1 - value), 0.534 - 0.534 * (1 - value), 0.131 + 0.869 * (1 - value) ]); } saturate(value = 1) { this.multiply([ 0.213 + 0.787 * value, 0.715 - 0.715 * value, 0.072 - 0.072 * value, 0.213 - 0.213 * value, 0.715 + 0.285 * value, 0.072 - 0.072 * value, 0.213 - 0.213 * value, 0.715 - 0.715 * value, 0.072 + 0.928 * value ]); } multiply(matrix) { let newR = this.clamp(this.r * matrix[0] + this.g * matrix[1] + this.b * matrix[2]); let newG = this.clamp(this.r * matrix[3] + this.g * matrix[4] + this.b * matrix[5]); let newB = this.clamp(this.r * matrix[6] + this.g * matrix[7] + this.b * matrix[8]); this.r = newR; this.g = newG; this.b = newB; } brightness(value = 1) { this.linear(value); } contrast(value = 1) { this.linear(value, -(0.5 * value) + 0.5); } linear(slope = 1, intercept = 0) { this.r = this.clamp(this.r * slope + intercept * 255); this.g = this.clamp(this.g * slope + intercept * 255); this.b = this.clamp(this.b * slope + intercept * 255); } invert(value = 1) { this.r = this.clamp((value + (this.r / 255) * (1 - 2 * value)) * 255); this.g = this.clamp((value + (this.g / 255) * (1 - 2 * value)) * 255); this.b = this.clamp((value + (this.b / 255) * (1 - 2 * value)) * 255); } hsl() { // Code taken from https://stackoverflow.com/a/9493060/2688027, licensed under CC BY-SA. let r = this.r / 255; let g = this.g / 255; let b = this.b / 255; let max = Math.max(r, g, b); let min = Math.min(r, g, b); let h, s, l = (max + min) / 2; if(max === min) { h = s = 0; } else { let d = max - min; s = l > 0.5 ? d / (2 - max - min) : d / (max + min); switch(max) { case r: h = (g - b) / d + (g < b ? 6 : 0); break; case g: h = (b - r) / d + 2; break; case b: h = (r - g) / d + 4; break; } h /= 6; } return { h: h * 100, s: s * 100, l: l * 100 }; } clamp(value) { if(value > 255) { value = 255; } else if(value < 0) { value = 0; } return value; } } class Solver { constructor(target) { this.target = target; this.targetHSL = target.hsl(); this.reusedColor = new Color(0, 0, 0); // Object pool } solve() { let result = this.solveNarrow(this.solveWide()); return { values: result.values, loss: result.loss, filter: this.css(result.values) }; } solveWide() { const A = 5; const c = 15; const a = [60, 180, 18000, 600, 1.2, 1.2]; </code>
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