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/gamma/data/lena.png | Bin 0 -> 473831 bytes
 Year_2/IandM/gamma/gamma.pde     |  26 ++++++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 Year_2/IandM/gamma/data/lena.png
 create mode 100644 Year_2/IandM/gamma/gamma.pde

(limited to 'Year_2/IandM/gamma')

diff --git a/Year_2/IandM/gamma/data/lena.png b/Year_2/IandM/gamma/data/lena.png
new file mode 100644
index 0000000..59ef68a
Binary files /dev/null and b/Year_2/IandM/gamma/data/lena.png differ
diff --git a/Year_2/IandM/gamma/gamma.pde b/Year_2/IandM/gamma/gamma.pde
new file mode 100644
index 0000000..8317e75
--- /dev/null
+++ b/Year_2/IandM/gamma/gamma.pde
@@ -0,0 +1,26 @@
+void setup() {
+  size(512, 256);
+  PImage img = loadImage("lena.png");
+  img.resize(256, 256);
+
+  image(img, 0, 0);
+  image(gamma(img, 2), 256, 0);
+}
+
+PImage gamma(PImage I, float gm) {
+  PImage out = I.copy();
+  out.loadPixels();
+  float r, g, b;
+  float C = 1 / pow(255, gm-1);
+
+  for (int i = 0; i < out.pixels.length; ++i) {
+    r= C*pow(red(out.pixels[i]), gm);
+    g= C*pow(green(out.pixels[i]), gm);
+    b= C*pow(blue(out.pixels[i]), gm);
+
+    out.pixels[i] = color(r, g, b);
+  }
+
+  out.updatePixels();
+  return out;
+}
-- 
cgit v1.2.3-18-g5258