Image To Ascii Art With PHP
This PHP function creates a simple ascii art rendering of a jpg image. It uses GD to do the grunt work and some simple bit shifting to allocate shades. Colors are then moved into hex values and the text generated for output to the browser. Ascii art from an image with PHP is now easy. If you feel you have any enhancements, feel free to contact PHPRO with your ideas.
<?php
function image2ascii( $image )
{
// return value
$ret = '';
// open the image
$img = ImageCreateFromJpeg($image);
// get width and height
$width = imagesx($img);
$height = imagesy($img);
// loop for height
for($h=0;$h<$height;$h++)
{
// loop for height
for($w=0;$w<=$width;$w++)
{
// add color
$rgb = ImageColorAt($img, $w, $h);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
// create a hex value from the rgb
$hex = '#'.str_pad(dechex($r), 2, '0', STR_PAD_LEFT).str_pad(dechex($g), 2, '0', STR_PAD_LEFT).str_pad(dechex($b), 2, '0', STR_PAD_LEFT);
// now add to the return string and we are done
if($w == $width)
{
$ret .= '<br>';
}
else
{
$ret .= '<span style="color:'.$hex.';">#</span>';
}
}
}
return $ret;
}
?>
Example Usage
<?php
// an image to convert
$image = 'test.jpg';
// do the conversion
$ascii = image2ascii( $image );
// and show the world
echo $ascii;
?>
Demonstration
