modified the files with required changes

Author: swastijain132005

filter.c

@@ -7,28 +7,30 @@
 int main(int argc, char *argv[])
 {
     // Define allowable filters
-    char *filters = "bgrsivtd";
-
-   
+    char *filters = "bgrsivtdB:";
 
 
-    char filterArr[argc - 3];
-int filterCount = 0;
-
-for(int i=0; i<argc; i++){
-char temp = getopt(argc,argv,filters);
-if(temp == -1) break;
-filterArr[i]= temp;
-if(filterArr[i] == '?') {
-printf("Invalid filter option");
-return 1;
-}
-}
-
+    char filterArr[argc-3];
+    int filterCount = 0;
 
-
+    // gets all filter flags and checks validity
+    int opt;
+    while ((opt = getopt(argc, argv, filters)) != -1) {
+        if (opt == '?') {
+            printf("Invalid filter option\n");
+            return 1;
+        }
+        filterArr[filterCount++] = opt;
+    }
 
 
+    // Ensure proper usage
+    if (argc < optind + 2)
+    {
+        printf("Usage: ./filter [flag] infile outfile\n");
+        return 3;
+    }
+
     // Remember filenames
     char *infile = argv[optind];
     char *outfile = argv[optind + 1];
@@ -96,7 +98,7 @@ return 1;
     }
 
     // Filter image
-    for(int i=0; i<argc-3; i++){
+    for(int i=0; i<filterCount; i++){
     switch (filterArr[i])
     {
         // Blur
@@ -122,25 +124,33 @@ return 1;
         case 'i':
             invert(height,width,image);
             break;
+
         // Vignette
         case 'v':
             vignette(height, width, image);
             break;
+
         case 't':
             threshold(height, width, image);
             break;
-
-            case 'd':  // Edge Detection
-    detect_edges(height, width, image);
-    break;
-
-      default:
-    printf("Unknown filter: %c\n", filterArr[i]);
-    free(image);
-    fclose(inptr);
-    fclose(outptr);
-    return 7;
-
+        
+        case 'd':  // Edge Detection
+            detect_edges(height, width, image);
+            break;
+            
+        // Brightness Adjust
+        case 'B': {
+            int brightness_value = atoi(optarg);
+            brightness(height, width, image, brightness_value);
+            break;
+        }
+        default:
+            printf("Unknown filter: %c\n", filterArr[i]);
+            free(image);
+            fclose(inptr);
+            fclose(outptr);
+            return 7;
+        
     }
     }
     // Write outfile's BITMAPFILEHEADER
@@ -169,4 +179,4 @@ return 1;
     fclose(inptr);
     fclose(outptr);
     return 0;
-}
+}

filter.exe

@@ -1,8 +1,6 @@
 #include "helpers.h"
 #include <stdint.h>
 #include <stdlib.h>
-#include <math.h>
-#include <stdio.h>
 #include "bmp.h"
 int min(int a,int b){
     if(a<b) return a;
@@ -151,8 +149,24 @@ void blur(int height, int width, RGBTRIPLE image[height][width]){
     free(temp);
 }
 
-// Blur image
-
+void brightness(int height, int width, RGBTRIPLE image[height][width], int value) {
+    for (int i = 0; i < height; i++) {
+        for (int j = 0; j < width; j++) {
+            int r = image[i][j].rgbtRed + value;
+            int g = image[i][j].rgbtGreen + value;
+            int b = image[i][j].rgbtBlue + value;
+            if (r > 255) r = 255;
+            if (g > 255) g = 255;
+            if (b > 255) b = 255;
+            if (r < 0) r = 0;
+            if (g < 0) g = 0;
+            if (b < 0) b = 0;
+            image[i][j].rgbtRed = r;
+            image[i][j].rgbtGreen = g;
+            image[i][j].rgbtBlue = b;
+        }
+    }
+}
 
 void vignette(int height, int width, RGBTRIPLE image[height][width]){
     float cx = width / 2.0; //  center of the image
@@ -200,11 +214,6 @@ void threshold(int height, int width, RGBTRIPLE image[height][width])
         }
     }
 }
-
-
-// ----------------------
-// EDGE DETECTION (SOBEL)
-// ----------------------
 void detect_edges(int height, int width, RGBTRIPLE image[height][width])
 {
     // Temporary copy of the image
@@ -274,4 +283,4 @@ void detect_edges(int height, int width, RGBTRIPLE image[height][width])
     for (int i = 0; i < height; i++)
         free(copy[i]);
     free(copy);
-}
+}

helpers.c

@@ -20,13 +20,18 @@ void reflect(int height, int width, RGBTRIPLE image[height][width]);
 
 // Blur image
 void blur(int height, int width, RGBTRIPLE image[height][width]);
-// Vignette image
-void vignette(int height, int width, RGBTRIPLE image[height][width]);
 
 //Threshold Filter(Black & White)
 void threshold(int height, int width, RGBTRIPLE image[height][width]);
 
-// **New: Edge Detection filter**
+// *New: Edge Detection filter*
 void detect_edges(int height, int width, RGBTRIPLE image[height][width]);
 
+// Brightness adjustment filter
+void brightness(int height, int width, RGBTRIPLE image[height][width], int value);
+
+// Vignette filter
+void vignette(int height, int width, RGBTRIPLE image[height][width]);
+
+
 #endif