imagecopyresized(3) [php man page]

IMAGECOPYRESIZED(3)							 1						       IMAGECOPYRESIZED(3)

imagecopyresized - Copy and resize part of an image

SYNOPSIS

       bool  imagecopyresized  (resource   $dst_image,	resource  $src_image, int  $dst_x, int	$dst_y, int  $src_x, int  $src_y, int  $dst_w, int
       $dst_h, int  $src_w, int  $src_h)

DESCRIPTION

       imagecopyresized(3) copies a rectangular portion of one image to another image. $dst_image is the  destination  image,  $src_image  is  the
       source image identifier.

	In  other  words,  imagecopyresized(3)	will  take  a  rectangular  area  from	$src_image  of	width $src_w and height $src_h at position
       ($src_x,$src_y) and place it in a rectangular area of $dst_image of width $dst_w and height $dst_h at position ($dst_x,$dst_y).

	If the source and destination coordinates and width and heights differ, appropriate stretching or shrinking of the image fragment will	be
       performed.  The	coordinates refer to the upper left corner. This function can be used to copy regions within the same image (if $dst_image
       is the same as $src_image) but if the regions overlap the results will be unpredictable.

PARAMETERS

	      o $dst_image
		-Destination image link resource.

	      o $src_image
		-Source image link resource.

	      o $dst_x
		- x-coordinate of destination point.

	      o $dst_y
		- y-coordinate of destination point.

	      o $src_x
		- x-coordinate of source point.

	      o $src_y
		- y-coordinate of source point.

	      o $dst_w
		- Destination width.

	      o $dst_h
		- Destination height.

	      o $src_w
		-Source width.

	      o $src_h
		-Source height.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Resizing an image

	       This example will display the image at half size.

	      <?php
	      // File and new size
	      $filename = 'test.jpg';
	      $percent = 0.5;

	      // Content type
	      header('Content-Type: image/jpeg');

	      // Get new sizes
	      list($width, $height) = getimagesize($filename);
	      $newwidth = $width * $percent;
	      $newheight = $height * $percent;

	      // Load
	      $thumb = imagecreatetruecolor($newwidth, $newheight);
	      $source = imagecreatefromjpeg($filename);

	      // Resize
	      imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

	      // Output
	      imagejpeg($thumb);
	      ?>

	      The above example will output something similar to:[NOT DISPLAYABLE MEDIA]Output of example : Resizing an image

	       The image will be output at half size, though better quality could be obtained using imagecopyresampled(3).

NOTES

       Note

	       There is a problem due to palette image limitations (255+1 colors). Resampling or filtering an image  commonly  needs  more  colors
	      than  255,  a kind of approximation is used to calculate the new resampled pixel and its color. With a palette image we try to allo-
	      cate a new color, if that failed, we choose the closest (in theory) computed color. This is not always  the  closest  visual  color.
	      That may produce a weird result, like blank (or visually blank) images. To skip this problem, please use a truecolor image as a des-
	      tination image, such as one created by imagecreatetruecolor(3).

SEE ALSO

       imagecopyresampled(3)

PHP Documentation Group 												       IMAGECOPYRESIZED(3)

Check Out this Related Man Page

Tk_ImageChanged(3)					       Tk Library Procedures						Tk_ImageChanged(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_ImageChanged - notify widgets that image needs to be redrawn

SYNOPSIS

       #include <tk.h>

       Tk_ImageChanged(imageMaster, x, y, width, height, imageWidth, imageHeight)

ARGUMENTS

       Tk_ImageMaster imageMaster (in)		Token for image, which was passed to image's createProc when the image was created.

       int x (in)				X-coordinate  of upper-left corner of region that needs redisplay (measured from upper-left corner
						of image).

       int y (in)				Y-coordinate of upper-left corner of region that needs redisplay (measured from upper-left  corner
						of image).

       int width (in)				Width of region that needs to be redrawn, in pixels.

       int height (in)				Height of region that needs to be redrawn, in pixels.

       int imageWidth (in)			Current width of image, in pixels.

       int imageHeight (in)			Current height of image, in pixels.
_________________________________________________________________

DESCRIPTION

       An  image manager calls Tk_ImageChanged for an image whenever anything happens that requires the image to be redrawn.  As a result of call-
       ing Tk_ImageChanged, any widgets using the image are notified so that they can redisplay themselves appropriately.  The	imageMaster  argu-
       ment  identifies the image, and x, y, width, and height specify a rectangular region within the image that needs to be redrawn.	imageWidth
       and imageHeight specify the image's (new) size.

       An image manager should call Tk_ImageChanged during its createProc to specify the image's initial size and to force redisplay if there  are
       existing  instances  for the image.  If any of the pixel values in the image should change later on, Tk_ImageChanged should be called again
       with x, y, width, and height values that cover all the pixels that changed.  If the size of the image should change,  then  Tk_ImageChanged
       must be called to indicate the new size, even if no pixels need to be redisplayed.

SEE ALSO

       Tk_CreateImageType

KEYWORDS

       images, redisplay, image size changes

Tk									4.0							Tk_ImageChanged(3)

Linux and UNIX Man Pages

imagecopyresized(3) [php man page]

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