A-M baby

Task/Grayscale-image/PHP/grayscale-image.php

@@ -0,0 +1,21 @@
+class BitmapGrayscale extends Bitmap {
+  public function toGrayscale(){
+    for ($i = 0; $i < $this->h; $i++){
+      for ($j = 0; $j < $this->w; $j++){
+        $l = ($this->data[$j][$i][0] * 0.2126)
+           + ($this->data[$j][$i][1] * 0.7152)
+           + ($this->data[$j][$i][2] * 0.0722);
+        $l = round($l);
+        $this->data[$j][$i] = array($l,$l,$l);
+      }
+    }
+  }
+}
+
+$b = new BitmapGrayscale(16,16);
+$b->fill(0,0,null,null, array(255,255,0));
+$b->setPixel(0, 15, array(255,0,0));
+$b->setPixel(0, 14, array(0,255,0));
+$b->setPixel(0, 13, array(0,0,255));
+$b->toGrayscale();
+$b->writeP6('p6-grayscale.ppm');