created exposure and tint in core

src/core/change_exposure.js

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+/**
+ * Function to change the exposure of an image.
+ * @param {number[]} pixelArray: Image pixel array in the format [R, G, B, alpha,..., R, G, B, alpha].
+ * @param {number} factor: Factor to adjust the exposure (-100 to 100).
+ * @returns {number[]} Pixel array of the image with adjusted exposure.
+ */
+function changeExposure(pixelArray, factor) {
+    for (let i = 0; i < pixelArray.length; i += 4) {
+        const r = pixelArray[i];
+        const g = pixelArray[i + 1];
+        const b = pixelArray[i + 2];
+
+        // Apply exposure adjustment to each channel
+        const newR = Math.max(0, Math.min(255, r + factor * 2.55)); // Factor scaled to range 0-255
+        const newG = Math.max(0, Math.min(255, g + factor * 2.55));
+        const newB = Math.max(0, Math.min(255, b + factor * 2.55));
+
+        pixelArray[i] = newR;
+        pixelArray[i + 1] = newG;
+        pixelArray[i + 2] = newB;
+    }
+    return pixelArray;
+}

src/core/change_tint.js

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+/**
+ * Function to change the tint of an image.
+ * @param {number[]} pixelArray: Image pixel array in the format [R, G, B, alpha,..., R, G, B, alpha].
+ * @param {number} tint: Tint to apply (-100 to 100).
+ * @returns {number[]} Pixel array of the image with adjusted tint.
+ */
+function changeTint(pixelArray, tint) {
+    for (let i = 0; i < pixelArray.length; i += 4) {
+        const r = pixelArray[i];
+        const g = pixelArray[i + 1];
+        const b = pixelArray[i + 2];
+
+        // Apply tint adjustment to each channel
+        const newR = Math.max(0, Math.min(255, r + (255 - r) * (tint / 100)));
+        const newG = Math.max(0, Math.min(255, g + (255 - g) * (tint / 100)));
+        const newB = Math.max(0, Math.min(255, b + (255 - b) * (tint / 100)));
+
+        pixelArray[i] = newR;
+        pixelArray[i + 1] = newG;
+        pixelArray[i + 2] = newB;
+    }
+    return pixelArray;
+}