added image-byte-array util

packages/server/src/utils/image-byte-array/index.js

@@ -0,0 +1,14 @@
+export default (image, numChannels) => {
+    const pixels = image.data
+    const numPixels = image.width * image.height
+
+    const values = new Int32Array(numPixels * numChannels)
+
+    for (let i = 0; i < numPixels; i++) {
+        for (let channel = 0; channel < numChannels; ++channel) {
+            values[i * numChannels + channel] = pixels[i * 4 + channel]
+        }
+    }
+
+    return values
+}