Merge branch 'main' into feature/brightness-adjust

Author: saumya1317

README.md

@@ -122,6 +122,22 @@ If you apply the above algorithm to each pixel in the image, the result should l
 ./filter -B -30 input.bmp output.bmp  # Decrease brightness by 30
 ```
 
+### 6.) The Threshold Algorithm
+
+The “threshold” filter converts a colorful image into a pure black-and-white one based on pixel intensity.
+
+For each pixel, the intensity is calculated as the average of its red, green, and blue values:
+
+\[
+\text{intensity} = \frac{(R + G + B)}{3}
+\]
+
+If the intensity is **greater than or equal to 128**, the pixel is set to **white** (`R = G = B = 255`).
+Otherwise, it is set to **black** (`R = G = B = 0`).
+
+This results in a high-contrast, two-tone image where all intermediate shades are eliminated — essentially a hard binary “black-and-white” conversion.
+
+
 ---
 
 ### Usage

helpers.c

@@ -187,3 +187,30 @@ void vignette(int height, int width, RGBTRIPLE image[height][width]){
         }
     }
 }
+
+//Threshold Filter(Black & White)
+void threshold(int height, int width, RGBTRIPLE image[height][width])
+{
+    for (int i = 0; i < height; i++)
+    {
+        for (int j = 0; j < width; j++)
+        {
+            int avg = round((image[i][j].rgbtRed +
+                             image[i][j].rgbtGreen +
+                             image[i][j].rgbtBlue) / 3.0);
+
+            if (avg >= 128)
+            {
+                image[i][j].rgbtRed = 255;
+                image[i][j].rgbtGreen = 255;
+                image[i][j].rgbtBlue = 255;
+            }
+            else
+            {
+                image[i][j].rgbtRed = 0;
+                image[i][j].rgbtGreen = 0;
+                image[i][j].rgbtBlue = 0;
+            }
+        }
+    }
+}

helpers.h

@@ -19,4 +19,4 @@ void blur(int height, int width, RGBTRIPLE image[height][width]);
 void brightness(int height, int width, RGBTRIPLE image[height][width], int value);
 
 // Vignette filter
-void vignette(int height, int width, RGBTRIPLE image[height][width]);
+void vignette(int height, int width, RGBTRIPLE image[height][width]);