---
name: "Test::Image::GD"
section: "3pm"
platform: "linux"
package: "libtest-image-gd-perl"
version: "0.03-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Test::Image::GD"
---

# Test::Image::GD(3pm)

A module for testing images using GD

## NAME

Test::Image::GD - A module for testing images using GD

## SYNOPSIS

```
  use Test::More plan => 1;
  use Test::Image::GD;

  cmp_image('test.gif', 'control.gif', '... these images should match');

  # or

  my $test = GD::Image->new('test.gif');
  my $control = GD::Image->new('control.gif');
  cmp_image($test, $control, '... these images should match');

  # some other test functions ...

  size_ok('camel.gif', [ 100, 350 ], '... the image is 100 x 350");

  height_ok('test.gif', 200, '... the image has a height of 200');
  width_ok('test.gif', 200, '... the image has a width of 200');
```

## DESCRIPTION

This module is meant to be used for testing custom graphics, it attempts  to "visually" compare the images, this means it ignores invisible differences  like color palettes and metadata. It also provides some extra functions to  check the size of the image.

## FUNCTIONS

- **cmp\_image ($got, $expected, $message)**

  This function will tell you whether the two images will look different,  ignoring differences in the order of colors in the color palette and  other invisible changes.

  Both `$got` and `$expected` can be either instances of `"GD::Image"` or  either a file handle or a file path (both are valid parameters to the  `"GD::Image"` constructor).

- **size\_ok ($got, \[ $width, $height \], ?$message)**

  This function will check if an image is a certain size.

  As with the `"cmp_image"` function, the `$got` parameter can be either an  instance of `"GD::Image"` or a file handle or a file path (all are valid  parameters to the `"GD::Image"` constructor).

- **height\_ok ($got, $height, ?$message)**

  This function will check if an image is a certain height.

  As with the `"cmp_image"` function, the `$got` parameter can be either an  instance of `"GD::Image"` or a file handle or a file path (all are valid  parameters to the `"GD::Image"` constructor).

- **width\_ok ($got, $width, ?$message)**

  This function will check if an image is a certain width.

  As with the `"cmp_image"` function, the `$got` parameter can be either an  instance of `"GD::Image"` or a file handle or a file path (all are valid  parameters to the `"GD::Image"` constructor).

## TO DO

- Add more functions

  This module currently serves a very basic need of mine, however, I am sure as  I start writing more tests against images I will find a need for other testing  functions. Any suggestions are welcome.

## BUGS

None that I am aware of. Of course, if you find a bug, let me know, and I  will be sure to fix it.

## CODE COVERAGE

I use **Devel::Cover** to test the code coverage of my tests, below is the  **Devel::Cover** report on this module test suite.

```
 ---------------------------- ------ ------ ------ ------ ------ ------ ------
 File                           stmt   bran   cond    sub    pod   time  total
 ---------------------------- ------ ------ ------ ------ ------ ------ ------
 Test/Image/GD.pm              100.0   91.7   63.6  100.0  100.0  100.0   93.7
 ---------------------------- ------ ------ ------ ------ ------ ------ ------
 Total                         100.0   91.7   63.6  100.0  100.0  100.0   93.7
 ---------------------------- ------ ------ ------ ------ ------ ------ ------
```

## SEE ALSO

The `"compare"` function of `"GD::Image"` class, that is how this `"cmp_image"` is  implemented.

## AUTHOR

Stevan Little, \<stevan@iinteractive.com\>

## COPYRIGHT AND LICENSE

Copyright 2005 by Infinity Interactive, Inc.

\<http://www.iinteractive.com\>

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