feat: add RgbToCmyk conversion algorithm

algorithm/conversion/RgbToCmyk.js

@@ -0,0 +1,59 @@
+/**
+ * Mengonversi nilai warna RGB ke format CMYK
+ * RGB: Red, Green, Blue (0-255)
+ * CMYK: Cyan, Magenta, Yellow, Key/Black (0-100%)
+ *
+ * Rumus:
+ * R' = R/255, G' = G/255, B' = B/255
+ * K = 1 - max(R', G', B')
+ * C = (1 - R' - K) / (1 - K)
+ * ... dst
+ *
+ * @param {number} r - Nilai Red (0-255)
+ * @param {number} g - Nilai Green (0-255)
+ * @param {number} b - Nilai Blue (0-255)
+ * @returns {object} Object berisi nilai c, m, y, k dalam persen
+ */
+
+const RgbToCmyk = (r, g, b) => {
+  let c = 0;
+  let m = 0;
+  let y = 0;
+  let k = 0;
+
+  // Validasi input
+  if (r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255) {
+    throw new Error("Nilai RGB harus antara 0 sampai 255");
+  }
+
+  // Normalisasi RGB ke rentang 0-1
+  r = r / 255;
+  g = g / 255;
+  b = b / 255;
+
+  k = 1 - Math.max(r, g, b);
+
+  if (k === 1) {
+    // Jika warna hitam pekat
+    return { c: 0, m: 0, y: 0, k: 100 };
+  } else {
+    c = ((1 - r - k) / (1 - k)) * 100;
+    m = ((1 - g - k) / (1 - k)) * 100;
+    y = ((1 - b - k) / (1 - k)) * 100;
+    k = k * 100;
+  }
+
+  // Pembulatan nilai agar rapi
+  return {
+    c: Math.round(c),
+    m: Math.round(m),
+    y: Math.round(y),
+    k: Math.round(k)
+  };
+};
+
+// Contoh Penggunaan (Wajib ada console.log)
+console.log(RgbToCmyk(255, 0, 0)); // Merah -> { c: 0, m: 100, y: 100, k: 0 }
+console.log(RgbToCmyk(0, 255, 0)); // Hijau -> { c: 100, m: 0, y: 100, k: 0 }
+console.log(RgbToCmyk(0, 0, 0)); // Hitam -> { c: 0, m: 0, y: 0, k: 100 }
+console.log(RgbToCmyk(255, 255, 255)); // Putih -> { c: 0, m: 0, y: 0, k: 0 }