From 2844addf484585770074c2065a90ceaaaee24c76 Mon Sep 17 00:00:00 2001
From: Igor Zinken <730069+igorski@users.noreply.github.com>
Date: Sat, 1 Aug 2026 12:59:51 +0200
Subject: [PATCH] Set missing LICENSE header to white balance process

---
 src/rendering/filters/white-balance.ts | 38 ++++++++++++++++++++------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/src/rendering/filters/white-balance.ts b/src/rendering/filters/white-balance.ts
index e7531df..dd592dd 100644
--- a/src/rendering/filters/white-balance.ts
+++ b/src/rendering/filters/white-balance.ts
@@ -1,33 +1,53 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Igor Zinken 2026 - https://www.igorski.nl
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
 export const applyWhiteBalance = ( pixels: Uint8ClampedArray ): void => {
     const totalPixels = pixels.length / 4;
 
     let totalR = 0, totalG = 0, totalB = 0;
 
-    // Step 1: Calculate the sum of all RGB values
+    // calculate the sum of all RGB values
     for ( let i = 0, len = pixels.length; i < len; i += 4) {
         totalR += pixels[ i ];
         totalG += pixels[ i + 1 ];
         totalB += pixels[ i + 2 ];
     }
 
-    // Step 2: Find the average value for each channel
+    // find the average value for each channel
     const avgR = totalR / totalPixels;
     const avgG = totalG / totalPixels;
     const avgB = totalB / totalPixels;
 
-    // Step 3: Calculate the overall average brightness
+    // calculate the overall average brightness
     const avgGray = ( avgR + avgG + avgB ) / 3;
 
-    // Step 4: Calculate scaling factors for each channel
+    // apply scaling factors per channel
     const scaleR = avgGray / avgR;
     const scaleG = avgGray / avgG;
     const scaleB = avgGray / avgB;
 
-    // Step 5: Apply the scaling factors to every pixel
     for ( let i = 0, len = pixels.length; i < len; i += 4 ) {
-        pixels[i]     = Math.min(255, pixels[i] * scaleR);     // New Red
-        pixels[i + 1] = Math.min(255, pixels[i + 1] * scaleG); // New Green
-        pixels[i + 2] = Math.min(255, pixels[i + 2] * scaleB); // New Blue
-        // data[i+3] is Alpha (transparency), leave it unchanged
+        pixels[ i ]     = Math.min( 255, pixels[ i ] * scaleR );
+        pixels[ i + 1 ] = Math.min( 255, pixels[ i + 1 ] * scaleG );
+        pixels[ i + 2 ] = Math.min( 255, pixels[ i + 2 ] * scaleB );
     }
 };