imagecolorsforindex(3) [php man page]

IMAGECOLORSFORINDEX(3)							 1						    IMAGECOLORSFORINDEX(3)

imagecolorsforindex - Get the colors for an index

SYNOPSIS

       array imagecolorsforindex (resource  $image, int  $index)

DESCRIPTION

	Gets the color for a specified index.

PARAMETERS

	      o $
		image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).

	      o $index
		- The color index.

RETURN VALUES

	Returns an associative array with red, green, blue and alpha keys that contain the appropriate values for the specified color index.

EXAMPLES

       Example #1

	      imagecolorsforindex(3) example

	      <?php

	      // open an image
	      $im = imagecreatefrompng('nexen.png');

	      // get a color
	      $start_x = 40;
	      $start_y = 50;
	      $color_index = imagecolorat($im, $start_x, $start_y);

	      // make it human readable
	      $color_tran = imagecolorsforindex($im, $color_index);

	      // what is it ?
	      print_r($color_tran);

	      ?>

	      The above example will output something similar to:

	      Array
	      (
		 [red] => 226
		 [green] => 222
		 [blue] => 252
		 [alpha] => 0
	      )

SEE ALSO

       imagecolorat(3), imagecolorexact(3).

PHP Documentation Group 												    IMAGECOLORSFORINDEX(3)

IMAGECOLORAT(3) 							 1							   IMAGECOLORAT(3)

imagecolorat - Get the index of the color of a pixel

SYNOPSIS

       int imagecolorat (resource  $image, int	$x, int  $y)

DESCRIPTION

	Returns the index of the color of the pixel at the specified location in the image specified by $image.

	If  PHP is compiled against GD library 2.0 or higher and the image is a truecolor image, this function returns the RGB value of that pixel
       as integer. Use bitshifting and masking to access the distinct red, green and blue component values:

PARAMETERS

	      o $
		image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3).

	      o $x
		- x-coordinate of the point.

	      o $y
		- y-coordinate of the point.

RETURN VALUES

	Returns the index of the color.

EXAMPLES

       Example #1

	      Access distinct RGB values

	      <?php
	      $im = imagecreatefrompng("php.png");
	      $rgb = imagecolorat($im, 10, 15);
	      $r = ($rgb >> 16) & 0xFF;
	      $g = ($rgb >> 8) & 0xFF;
	      $b = $rgb & 0xFF;

	      var_dump($r, $g, $b);
	      ?>

	      The above example will output something similar to:

	      int(119)
	      int(123)
	      int(180)

       Example #2

	      Human-readable RGB values using imagecolorsforindex(3)

	      <?php
	      $im = imagecreatefrompng("php.png");
	      $rgb = imagecolorat($im, 10, 15);

	      $colors = imagecolorsforindex($im, $rgb);

	      var_dump($colors);
	      ?>

	      The above example will output something similar to:

	      array(4) {
		["red"]=>
		int(119)
		["green"]=>
		int(123)
		["blue"]=>
		int(180)
		["alpha"]=>
		int(127)
	      }

SEE ALSO

       imagecolorset(3), imagecolorsforindex(3), imagesetpixel(3).

PHP Documentation Group 													   IMAGECOLORAT(3)