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Template::Plugin::Image(3)     User Contributed Perl Documentation     Template::Plugin::Image(3)

NAME
       Template::Plugin::Image - Plugin access to image sizes

SYNOPSIS
	   [% USE Image(filename) %]
	   [% Image.width %]
	   [% Image.height %]
	   [% Image.size.join(', ') %]
	   [% Image.attr %]
	   [% Image.tag %]

DESCRIPTION
       This plugin provides an interface to the Image::Info or Image::Size modules for
       determining the size of image files.

       You can specify the plugin name as either '"Image"' or '"image"'.  The plugin object
       created will then have the same name.  The file name of the image should be specified as a
       positional or named argument.

	   [% # all these are valid, take your pick %]
	   [% USE Image('foo.gif') %]
	   [% USE image('bar.gif') %]
	   [% USE Image 'ping.gif' %]
	   [% USE image(name='baz.gif') %]
	   [% USE Image name='pong.gif' %]

       A "root" parameter can be used to specify the location of the image file:

	   [% USE Image(root='/path/to/root', name='images/home.png') %]
	   # image path: /path/to/root/images/home.png
	   # img src: images/home.png

       In cases where the image path and image url do not match up, specify the file name
       directly:

	   [% USE Image(file='/path/to/home.png', name='/images/home.png') %]

       The "alt" parameter can be used to specify an alternate name for the image, for use in
       constructing an XHTML element (see the "tag()" method below).

	   [% USE Image('home.png', alt="Home") %]

       You can also provide an alternate name for an "Image" plugin object.

	   [% USE img1 = image 'foo.gif' %]
	   [% USE img2 = image 'bar.gif' %]

       The "name" method returns the image file name.

	   [% img1.name %]     # foo.gif

       The "width" and "height" methods return the width and height of the image, respectively.
       The "size" method returns a reference to a 2 element list containing the width and height.

	   [% USE image 'foo.gif' %]
	   width: [% image.width %]
	   height: [% image.height %]
	   size: [% image.size.join(', ') %]

       The "modtime" method returns the modification time of the file in question, suitable for
       use with the Date plugin, for example:

	   [% USE image 'foo.gif' %]
	   [% USE date %]
	   [% date.format(image.modtime, "%B, %e %Y") %]

       The "attr" method returns the height and width as HTML/XML attributes.

	   [% USE image 'foo.gif' %]
	   [% image.attr %]

       Typical output:

	   width="60" height="20"

       The "tag" method returns a complete XHTML tag referencing the image.

	   [% USE image 'foo.gif' %]
	   [% image.tag %]

       Typical output:

	   <img src="foo.gif" width="60" height="20" alt="" />

       You can provide any additional attributes that should be added to the XHTML tag.

	   [% USE image 'foo.gif' %]
	   [% image.tag(class="logo" alt="Logo") %]

       Typical output:

	   <img src="foo.gif" width="60" height="20" alt="Logo" class="logo" />

       Note that the "alt" attribute is mandatory in a strict XHTML "img" element (even if it's
       empty) so it is always added even if you don't explicitly provide a value for it.  You can
       do so as an argument to the "tag" method, as shown in the previous example, or as an
       argument

	   [% USE image('foo.gif', alt='Logo') %]

CATCHING ERRORS
       If the image file cannot be found then the above methods will throw an "Image" error.  You
       can enclose calls to these methods in a "TRY...CATCH" block to catch any potential errors.

	   [% TRY;
		image.width;
	      CATCH;
		error;	    # print error
	      END
	   %]

USING Image::Info
       At run time, the plugin tries to load Image::Info in preference to Image::Size. If
       Image::Info is found, then some additional methods are available, in addition to "size",
       "width", "height", "attr", and "tag".  These additional methods are named after the
       elements that Image::Info retrieves from the image itself. The types of methods available
       depend on the type of image (see Image::Info for more details). These additional methods
       will always include the following:

   file_media_type
       This is the MIME type that is appropriate for the given file format.  The corresponding
       value is a string like: ""image/png"" or ""image/jpeg"".

   file_ext
       The is the suggested file name extention for a file of the given file format.  The value
       is a 3 letter, lowercase string like ""png"", ""jpg"".

   color_type
       The value is a short string describing what kind of values the pixels encode.  The value
       can be one of the following:

	   Gray
	   GrayA
	   RGB
	   RGBA
	   CMYK
	   YCbCr
	   CIELab

       These names can also be prefixed by ""Indexed-"" if the image is composed of indexes into
       a palette.  Of these, only ""Indexed-RGB"" is likely to occur.

       (It is similar to the TIFF field PhotometricInterpretation, but this name was found to be
       too long, so we used the PNG inpired term instead.)

   resolution
       The value of this field normally gives the physical size of the image on screen or paper.
       When the unit specifier is missing then this field denotes the squareness of pixels in the
       image.

       The syntax of this field is:

	  <res> <unit>
	  <xres> "/" <yres> <unit>
	  <xres> "/" <yres>

       The "<res>", "<xres>" and "<yres>" fields are numbers.  The "<unit>" is a string like
       "dpi", "dpm" or "dpcm" (denoting "dots per inch/cm/meter).

   SamplesPerPixel
       This says how many channels there are in the image.  For some image formats this number
       might be higher than the number implied from the "color_type".

   BitsPerSample
       This says how many bits are used to encode each of samples.  The value is a reference to
       an array containing numbers. The number of elements in the array should be the same as
       "SamplesPerPixel".

   Comment
       Textual comments found in the file.  The value is a reference to an array if there are
       multiple comments found.

   Interlace
       If the image is interlaced, then this returns the interlace type.

   Compression
       This returns the name of the compression algorithm is used.

   Gamma
       A number indicating the gamma curve of the image (e.g. 2.2)

AUTHOR
       Andy Wardley <abw@wardley.org> <http://wardley.org/>

COPYRIGHT
       Copyright (C) 1996-2007 Andy Wardley.  All Rights Reserved.

       This module is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

SEE ALSO
       Template::Plugin, Image::Info

perl v5.16.3				    2011-12-20		       Template::Plugin::Image(3)
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