exif_thumbnail(3) [php man page]

EXIF_THUMBNAIL(3)							 1							 EXIF_THUMBNAIL(3)

exif_thumbnail - Retrieve the embedded thumbnail of a TIFF or JPEG image

SYNOPSIS

       string exif_thumbnail (string  $filename, [int  &$width], [int  &$height], [int	&$imagetype])

DESCRIPTION

       exif_thumbnail(3) reads the embedded thumbnail of a TIFF or JPEG image.

	If you want to deliver thumbnails through this function, you should send the mimetype information using the header(3) function.

	It  is	possible  that	exif_thumbnail(3)  cannot  create an image but can determine its size. In this case, the return value is FALSE but
       $width and $height are set.

PARAMETERS

	      o $filename
		- The name of the image file being read. This image contains an embedded thumbnail.

	      o $width
		- The return width of the returned thumbnail.

	      o $height
		- The returned height of the returned thumbnail.

	      o $imagetype
		- The returned image type of the returned thumbnail. This is either TIFF or JPEG.

RETURN VALUES

	Returns the embedded thumbnail, or FALSE if the image contains no thumbnail.

EXAMPLES

       Example #1

	      exif_thumbnail(3) example

	      <?php
	      if (array_key_exists('file', $_REQUEST)) {
		  $image = exif_thumbnail($_REQUEST['file'], $width, $height, $type);
	      } else {
		  $image = false;
	      }
	      if ($image!==false) {
		  header('Content-type: ' .image_type_to_mime_type($type));
		  echo $image;
		  exit;
	      } else {
		  // no thumbnail available, handle the error here
		  echo 'No thumbnail available';
	      }
	      ?>

SEE ALSO

       exif_read_data(3), image_type_to_mime_type(3).

PHP Documentation Group 													 EXIF_THUMBNAIL(3)

THUMBNAIL(1)						      General Commands Manual						      THUMBNAIL(1)

NAME

       thumbnail - create a TIFF file with thumbnail images

SYNOPSIS

       thumbnail [ options ] input.tif output.tif

DESCRIPTION

       thumbnail  is a program written to show how one might use the SubIFD tag (#330) to store thumbnail images.  thumbnail copies a TIFF Class F
       facsimile file to the output file and for each image an 8-bit greyscale thumbnail sketch.  The output file  contains  the  thumbnail  image
       with the associated full-resolution page linked below with the SubIFD tag.

       By  default, thumbnail images are 216 pixels wide by 274 pixels high.  Pixels are calculated by sampling and filtering the input image with
       each pixel value passed through a contrast curve.

OPTIONS

       -w     Specify the width of thumbnail images in pixels.

       -h     Specify the height of thumbnail images in pixels.

       -c     Specify a contrast curve to apply in generating the thumbnail images.  By default pixels values are passed through a linear contrast
	      curve  that simply maps the pixel value ranges.  Alternative curves are: exp50 for a 50% exponential curve, exp60 for a 60% exponen-
	      tial curve, exp70 for a 70% exponential curve, exp80 for a 80% exponential curve, exp90 for a 90% exponential curve, exp for a  pure
	      exponential curve, linear for a linear curve.

BUGS

       There are no options to control the format of the saved thumbnail images.

SEE ALSO

       tiffdump(1), tiffgt(1), tiffinfo(1), libtiff(3)

								September 26, 1994						      THUMBNAIL(1)