From 321b268bb74512289f9eb361560e8ceb9d30fe59 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 16 Feb 2021 21:51:54 +0100
Subject: i&m: add operations

---
 Year_2/IandM/negative/negative.pde | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Year_2/IandM/negative/negative.pde

(limited to 'Year_2/IandM/negative/negative.pde')

diff --git a/Year_2/IandM/negative/negative.pde b/Year_2/IandM/negative/negative.pde
new file mode 100644
index 0000000..c7c4475
--- /dev/null
+++ b/Year_2/IandM/negative/negative.pde
@@ -0,0 +1,25 @@
+void setup() {
+  size(512, 256);
+  PImage img = loadImage("lena.png");
+  img.resize(256, 256);
+  
+  image(img, 0, 0);
+  image(negative(img), 256, 0);
+}
+
+PImage negative(PImage I) {
+  PImage out = I.copy();
+  out.loadPixels();
+  float r, g, b;
+
+  for (int i = 0; i < out.pixels.length; ++i) {
+    r= 255-red(out.pixels[i]);
+    g= 255-green(out.pixels[i]);
+    b= 255-blue(out.pixels[i]);
+
+    out.pixels[i] = color(r, g, b);
+  }
+
+  out.updatePixels();
+  return out;
+}
-- 
cgit v1.2.3-18-g5258