PHP Classes

GD2 Imaging: Deskew and apply other advanced image effects

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Version License PHP version Categories
gd2-imaging 1.7.4GNU Lesser Genera...5.2PHP 5, Graphics
Description 

Author

Artur Graniszewski

This class can apply several types of advanced image processing effects. Currently it can:

* Use the Hough transform to detect skew angles and deskew an image
* Detect the background color of an image
* Perform image quantization basic text recognition (OCR) in an image to eventually read text used for CAPTCHA validation
* Apply the pastel effect on an image
* Crop an image preserving the image aspect
* Remove a noise from an image
* Rotate or rescale an image detecting its background color
* Generate an histograms for an image
* Calculate pixel luminance (intensity), hue, saturation and chromacity of the RGB colors in three different color modes (HSL, HSI, HSV)
* Change hue of the image
* Change luminance of the image
* Change saturation of the image
* Create High-Definition-Range (HDR) images
* Use advanced programmable Pixel Shader
* Merge two images using eight different blending modes:
- addition
- divide
- subtract
- darken
- lighten
- difference
- multiply
- opacity
* Apply experimental blur effect with customizable kernel size.

Innovation Award
PHP Programming Innovation award nominee
November 2011
Number 2

Prize: One downloadable copy of PhpED Professional		 PHP can use the GD library to provide basic image manipulation functions.

This class goes further and implements additional advanced image manipulation functions in pure PHP.

Manuel Lemos
Picture of Artur Graniszewski
  Performance   Level  

Level 1 Star

 Innovation award
Innovation award
Nominee: 7x

Winner: 1x

 

Example

<?php

require_once('../gd2imaging.php');

$image = new Image('hawaii.jpg');
// Luminance set to 140%
$image->setLuminance(1.4);
// Color saturation set to 220%
$image->setSaturation(2.2);
$image->show();

Screenshots (10)  
  • noise_reduction.png
  • ocr_text_recognition.png
  • auto_deskewing.png
  • ocr_captcha_reader.PNG
  • pastelization.png
  • skew_detection.png
  • background_color.png
  • histogram.png
  • hue_rotation.jpg
  • vibrant_colors.jpg
  Files folder image Files (40)  
File Role Description
Files folder imagedocumentation (9 files)
Files folder imageexamples (19 files)
Plain text file gd2imaging.php Class Main class source.
Accessible without login Plain text file license.txt Lic. LGPL license file.

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  Applications that use this package  
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  Other classes that need this package  
Class Why it is needed Dependency
ASCII art generator for PHP GD2 Imaging is used for image quantization (OCR) - this library is provided with the ASCII generator package Required

  Related pages  
Features demonstration of the GD2 Imaging class
Description of the Hough transform used in a deskew methods.
Description of a median used in noise reduction.
Description of an image quantization used in OCR.
Description of the image histogram.
Description of two popular color spaces