- A minimum (minimum, minimum, minimum requeriments is needed). Tested on:
	
- Simple Raspberry pi (B +	512MB	700 MHz ARM11) with Raspbian Lite PHP7.3 (i love this gadgets)  :heart_eyes:
	
- VirtualBox Ubuntu Server 20.04.2 LTS (Focal Fossa) with PHP7.4.3 

- Ubuntu 20.04.3 LTS (Focal Fossa). Laptop Acer Extensa 5630 with PHP 7.4.3 (built: Aug 13 2021 05:39:12) ( NTS )

- Red Hat Enterprise Linux Server release 6.10 (Santiago) PHP Version 7.3.25 (Production Server) 512Mb Memory Limit

- PHP with GD enabled: sudo apt install php-gd

- If you need to use IMG_FILTER_SCATTER you need at least PHP >= PHP7.4.0. See official doc: https://www.php.net/manual/en/function.imagefilter.php

- PHP with Imagick for some functions. It is not required for by most methods, but in some, like reading pdf or psd, you will need it. Install: sudo apt install php-imagick

- For open pdf's, if you get attempt to perform an operation not allowed by the security policy `PDF'
   Add 
   
   < policy domain="coder" rights="read | write" pattern="PDF" />
   
   just before </policymap> in /etc/ImageMagick-7/policy.xml
   - Change ImageMagick-7 with your Imagick version
   
  
- Requires https://github.com/zaachi/PHP-Instagram-effects

     require_once( 'img2img.class.php' );

     $img2img = new img2img( __DIR__.'/source_example.jpg' );
     $img2img->filter( IMG_FILTER_SEPIA, 4, 80 );
     $img2img->save( '/tmp/img2img_result_3.jpg' );

	'arr_thb_default_sizes' => [ '2048x1152' => [2048, 1152],  '1920x1080' => [1920, 1080], '1366x768' => [1366, 768], '640x480' => [640, 480], '512x384' => [512, 384], '320x240' => [320, 240], '200x150' => [200, 150] ],

	'quality' => 100, // 100 = best (more file size), 0 = poor (less file size)

	'tmpdir' => '/tmp',

	'pdfresolution' => 300, // When open pdf file for capture page as image

	'autodetect_mimetypes' => false, // See notes at file_extension()

	'debug' => true // Set to true to see errors

     $img2img = new img2img( __DIR__.'/source_example.jpg' );

	$gd = imagecreatefromjpeg( __DIR__.'/source_example.jpg');		
    	$img2img->set_gd( $gd );

     $img2img->thumb( 3 ); // 640x480
     
     $img2img->thumb( '640x480' ); // 640x480
     
     $img2img->thumb( '640x200', false ); // 640x200 without maintain aspect ratio

    $img2img->resample( 640, 480 ); // 640x480

   $img2img->save( '/tmp/img2img_result_4.jpg' );

   $img2img->base64( 'jpg' );

   $img2img->raw( 'jpg' );

   $img2img->flip( );

 * IMG_FILTER_NEGATE: Reverses all colors of the image.
 * IMG_FILTER_GRAYSCALE: Converts the image into grayscale by changing the red, green and blue components to their weighted sum using the same coefficients as the REC.601 luma (Y') calculation. The alpha components are retained. For palette images the result may differ due to palette limitations.
 * IMG_FILTER_BRIGHTNESS: Changes the brightness of the image. Use args to set the level of brightness. The range for the brightness is -255 to 255.
 * IMG_FILTER_CONTRAST: Changes the contrast of the image. Use args to set the level of contrast.
 * IMG_FILTER_COLORIZE: Like IMG_FILTER_GRAYSCALE, except you can specify the color. Use args, arg2 and arg3 in the form of red, green, blue and arg4 for the alpha channel. The range for each color is 0 to 255.
 * IMG_FILTER_EDGEDETECT: Uses edge detection to highlight the edges in the image.
 * IMG_FILTER_EMBOSS: Embosses the image.
 * IMG_FILTER_GAUSSIAN_BLUR: Blurs the image using the Gaussian method.
 * IMG_FILTER_SELECTIVE_BLUR: Blurs the image.
 * IMG_FILTER_MEAN_REMOVAL: Uses mean removal to achieve a "sketchy" effect.
 * IMG_FILTER_SMOOTH: Makes the image smoother. Use args to set the level of smoothness.
 * IMG_FILTER_PIXELATE: Applies pixelation effect to the image, use args to set the block size and arg2 to set the pixelation effect mode.
 * IMG_FILTER_SCATTER: Applies scatter effect to the image, use args and arg2 to define the effect strength and additionally arg3 to only apply the on select pixel colors. NOTE: PHP >= PHP7.4.0
 * IMG_FILTER_SEPIA: Use arg1 to use between different types of sepia and arg2 & arg3 to define de effect
 * IMG_FILTER_BLACK_WHITE: Use to create a black & white image
 * IMG_FILTER_VIGNETTE: arg1: blackPoint, arg2: $whitePoint, arg3: $x, arg4: $y
 * args
 * IMG_FILTER_BRIGHTNESS: Brightness level.
 * IMG_FILTER_CONTRAST: Contrast level.
 * IMG_FILTER_COLORIZE: Value of red component.
 * IMG_FILTER_SMOOTH: Smoothness level.
 * IMG_FILTER_PIXELATE: Block size in pixels.
 * IMG_FILTER_SCATTER: Effect substraction level. This must not be higher or equal to the addition level set with arg2. NOTE: PHP >= PHP7.4.0
 * IMG_FILTER_SEPIA:	Define type of sepia
 * arg2
 * IMG_FILTER_COLORIZE: Value of green component.
 * IMG_FILTER_PIXELATE: Whether to use advanced pixelation effect or not (defaults to false).
 * IMG_FILTER_SCATTER: Effect addition level. NOTE: PHP >= PHP7.4.0
 * IMG_FILTER_SEPIA: if (arg1 == 2) Defines % of sepia. if(arg1 == 4): Define tone of sepia in Imagick sepiaToneImage()
 * arg3
 * IMG_FILTER_COLORIZE: Value of blue component.
 * IMG_FILTER_SCATTER: Optional array indexed color values to apply effect at. NOTE: PHP >= PHP7.4.0
 * arg4
 * IMG_FILTER_COLORIZE: Alpha channel, A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.

     IMG_FILTER_INSTGR_BUBBLES, IMG_FILTER_INSTGR_COLORISE, IMG_FILTER_INSTGR_SEPIA, IMG_FILTER_INSTGR_SEPIA2, IMG_FILTER_INSTGR_SHARPEN,
  IMG_FILTER_INSTGR_EMBOSS, IMG_FILTER_INSTGR_COOL, IMG_FILTER_INSTGR_OLD, IMG_FILTER_INSTGR_OLD2, IMG_FILTER_INSTGR_OLD3, IMG_FILTER_INSTGR_LIGHT,
  IMG_FILTER_INSTGR_AQUA, IMG_FILTER_INSTGR_FUZZY, IMG_FILTER_INSTGR_BOOST, IMG_FILTER_INSTGR_BOOST2, IMG_FILTER_INSTGR_GRAY, IMG_FILTER_INSTGR_ANTIQUE,
  IMG_FILTER_INSTGR_BLACKWHITE, IMG_FILTER_INSTGR_BLUR, IMG_FILTER_INSTGR_VINTAGE, IMG_FILTER_INSTGR_CONCENTRATE, IMG_FILTER_INSTGR_HERMAJESTY, 
  IMG_FILTER_INSTGR_FRESHBLUE, IMG_FILTER_INSTGR_TENDER, IMG_FILTER_INSTGR_DREAM, IMG_FILTER_INSTGR_FROZEN, IMG_FILTER_INSTGR_FOREST, 
  IMG_FILTER_INSTGR_RAIN, IMG_FILTER_INSTGR_ORANGEPEEL, IMG_FILTER_INSTGR_DARKEN, IMG_FILTER_INSTGR_SUMMER, IMG_FILTER_INSTGR_RETRO, 
  IMG_FILTER_INSTGR_COUNTRY, IMG_FILTER_INSTGR_WASHED

   $img2img->filter( IMG_FILTER_SEPIA, 4, 80 );

   $gd = $img2img->gd( );

	IMG_BELL: Bell filter.
	IMG_BESSEL: Bessel filter.
	IMG_BICUBIC: Bicubic interpolation.
	IMG_BICUBIC_FIXED: Fixed point implementation of the bicubic interpolation.
	IMG_BILINEAR_FIXED: Fixed point implementation of the bilinear interpolation (default (also on image creation)).
	IMG_BLACKMAN: Blackman window function.
	IMG_BOX: Box blur filter.
	IMG_BSPLINE: Spline interpolation.
	IMG_CATMULLROM: Cubic Hermite spline interpolation.
	IMG_GAUSSIAN: Gaussian function.
	IMG_GENERALIZED_CUBIC: Generalized cubic spline fractal interpolation.
	IMG_HERMITE: Hermite interpolation.
	IMG_HAMMING: Hamming filter.
	IMG_HANNING: Hanning filter.
	IMG_MITCHELL: Mitchell filter.
	IMG_POWER: Power interpolation.
	IMG_QUADRATIC: Inverse quadratic interpolation.
	IMG_SINC: Sinc function.
	IMG_NEAREST_NEIGHBOUR: Nearest neighbour interpolation.
	IMG_WEIGHTED4: Weighting filter.
	IMG_TRIANGLE: Triangle interpolation.

   $gd = $img2img->imagesetinterpolation( IMG_BICUBIC );

   $img2img->->imagescale( 640, 480, IMG_BICUBIC );

   $img2img->mirror( );