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---
layout: default
---
<h3>Reading</h3>
<p>An image is recreated from its individual component colors.
The many colors of the image are created through modulating the
red, green, and blue values. This is an exageration of an LCD display.</p>
<p><a href="http://processing.org/learning/basics/reading.html">Original Processing.org Example: Reading</a><br>
<div class="learning-demo"><script type="application/processing">
// @pjs preload must be used to preload the image so that it will be available when used in the sketch
/* @pjs preload="data/cait.jpg"; */
size(200, 200);
noStroke();
background(0);
// Load an image from the data directory
PImage c;
c = loadImage("data/cait.jpg");
int xoff = 0;
int yoff = 0;
int p = 2;
int pix = p*3;
for(int i = 0; i < c.width*c.height; i += 1)
{
int here = c.pixels[i];
fill(red(here), 0, 0);
rect(xoff, yoff, p, pix);
fill(0, green(here), 0);
rect(xoff+p, yoff, p, pix);
fill(0, 0, blue(here));
rect(xoff+p*2, yoff, p, pix);
xoff+=pix;
if(xoff >= width-pix) {
xoff = 0;
yoff += pix;
}
}
</script><canvas width="200" height="200"></canvas></div></p>
<div style="height:0px;width:0px;overflow:hidden;"><img src='data/cait.jpg' id='cait.jpg'/></div>
<div class="code"><pre name="code" class="processing">// All Examples Written by Casey Reas</a> and Ben Fry</a>
// unless otherwise stated.
// @pjs preload must be used to preload the image so that it will be available when used in the sketch
/* @pjs preload="data/cait.jpg"; */
size(200, 200);
noStroke();
background(0);
// Load an image from the data directory
PImage c;
c = loadImage("data/cait.jpg");
int xoff = 0;
int yoff = 0;
int p = 2;
int pix = p*3;
for(int i = 0; i < c.width*c.height; i += 1)
{
int here = c.pixels[i];
fill(red(here), 0, 0);
rect(xoff, yoff, p, pix);
fill(0, green(here), 0);
rect(xoff+p, yoff, p, pix);
fill(0, 0, blue(here));
rect(xoff+p*2, yoff, p, pix);
xoff+=pix;
if(xoff >= width-pix) {
xoff = 0;
yoff += pix;
}
}</pre></div>