Andy Wardley > Template-Toolkit-2.14 > Template::Plugin::Image

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Module Version: 1.14   Source   Latest Release: Template-Toolkit-2.25

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' %]

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

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

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

    [% USE image 'foo.gif' %]
    [% image.tag(border=0, class="logo") %]

Typical output:

    <img src="foo.gif" width="60" height="20" border="0" class="logo" />

The 'modtime' method returns the ctime of the file in question, suitable for use with date.format:

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

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; see Image::Info for more details -- the types of methods available depend on the type of image. 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 tell which interlace method is used.

Compression

This tell which compression algorithm is used.

Gamma

A number.

AUTHOR ^

Andy Wardley <abw@andywardley.com>

http://www.andywardley.com/

VERSION ^

1.14, distributed as part of the Template Toolkit version 2.14, released on 04 October 2004.

COPYRIGHT ^

  Copyright (C) 1996-2004 Andy Wardley.  All Rights Reserved.
  Copyright (C) 1998-2002 Canon Research Centre Europe Ltd.

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

SEE ALSO ^

Template::Plugin

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