imagelayereffect(3) [php man page]

IMAGELAYEREFFECT(3)							 1						       IMAGELAYEREFFECT(3)

imagelayereffect - Set the alpha blending flag to use the bundled libgd layering effects

SYNOPSIS

       bool imagelayereffect (resource	$image, int  $effect)

DESCRIPTION

	Set the alpha blending flag to use the bundled libgd layering effects.

PARAMETERS

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

	      o $effect
		- One of the following constants:

		     o IMG_EFFECT_REPLACE - Use pixel replacement (equivalent of passing TRUE to imagealphablending(3))

		     o IMG_EFFECT_ALPHABLEND - Use normal pixel blending (equivalent of passing FALSE to imagealphablending(3))

		     o IMG_EFFECT_NORMAL - Same as IMG_EFFECT_ALPHABLEND.

		     o IMG_EFFECT_OVERLAY  -  Overlay  has the effect that black background pixels will remain black, white background pixels will
		       remain white, but grey background pixels will take the colour of the foreground pixel.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      imagelayereffect(3) example

	      <?php
	      // Setup an image
	      $im = imagecreatetruecolor(100, 100);

	      // Set a background
	      imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im, 220, 220, 220));

	      // Apply the overlay alpha blending flag
	      imagelayereffect($im, IMG_EFFECT_OVERLAY);

	      // Draw two grey ellipses
	      imagefilledellipse($im, 50, 50, 40, 40, imagecolorallocate($im, 100, 255, 100));
	      imagefilledellipse($im, 50, 50, 50, 80, imagecolorallocate($im, 100, 100, 255));
	      imagefilledellipse($im, 50, 50, 80, 50, imagecolorallocate($im, 255, 100, 100));

	      // Output
	      header('Content-type: image/png');

	      imagepng($im);
	      imagedestroy($im);
	      ?>

	      The above example will output something similar to:[NOT DISPLAYABLE MEDIA]Output of example : imagelayereffect()

NOTES

       Note

	      This function requires GD 2.0.1 or later (2.0.28 or later is recommended).

PHP Documentation Group 												       IMAGELAYEREFFECT(3)

IMAGEANTIALIAS(3)							 1							 IMAGEANTIALIAS(3)

imageantialias - Should antialias functions be used or not

SYNOPSIS

       bool imageantialias (resource  $image, bool  $enabled)

DESCRIPTION

	Activate  the fast drawing antialiased methods for lines and wired polygons. It does not support alpha components. It works using a direct
       blend operation. It works only with truecolor images.

	Thickness and styled are not supported.

	Using antialiased primitives with transparent background color can end with some unexpected results. The blend method uses the	background
       color as any other colors. The lack of alpha component support does not allow an alpha based antialiasing method.

PARAMETERS

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

	      o $enabled
		- Whether to enable antialiasing or not.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      A comparison of two lines, one with anti-aliasing switched on

	      <?php
	      // Setup an anti-aliased image and a normal image
	      $aa = imagecreatetruecolor(400, 100);
	      $normal = imagecreatetruecolor(200, 100);

	      // Switch antialiasing on for one image
	      imageantialias($aa, true);

	      // Allocate colors
	      $red = imagecolorallocate($normal, 255, 0, 0);
	      $red_aa = imagecolorallocate($aa, 255, 0, 0);

	      // Draw two lines, one with AA enabled
	      imageline($normal, 0, 0, 200, 100, $red);
	      imageline($aa, 0, 0, 200, 100, $red_aa);

	      // Merge the two images side by side for output (AA: left, Normal: Right)
	      imagecopymerge($aa, $normal, 200, 0, 0, 0, 200, 100, 100);

	      // Output image
	      header('Content-type: image/png');

	      imagepng($aa);
	      imagedestroy($aa);
	      imagedestroy($normal);
	      ?>

	      The  above  example  will output something similar to:[NOT DISPLAYABLE MEDIA]Output of example : A comparison of two lines, one with
	      anti-aliasing switched on

NOTES

SEE ALSO

       imagecreatetruecolor(3).

PHP Documentation Group 													 IMAGEANTIALIAS(3)