imagecropauto

(PHP 5 >= 5.5.0)

imagecropauto — Crop an image automatically using one of the available modes

Description

resource imagecropauto ( resource $image [, int $mode = -1 [, float $threshold = .5 [, int $color = -1 ]]] )

Warning

This function is currently not documented; only its argument list is available.

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
mode: One of IMG_CROP_* constants.
threshold: Used in IMG_CROP_THRESHOLD mode.
color: Used in IMG_CROP_THRESHOLD mode.

Return Values

Return cropped image resource on success or FALSE on failure.

Коментарии

Jul 19

Автор: raphael.deiana


In some cases the use of the IMG_CROP_WHITE or IMG_CROP_BLACK does not work. The function returns FALSE. It is best to use the IMG_CROP_THRESHOLD mode and specify the color in fourth argument as in the example below :



<?php



$original_img = imagecreatefromjpeg($image_path);



// Use this :

$cropped_img_white = imagecropauto($original_img , IMG_CROP_THRESHOLD, null, 16777215);

// Rather than :

$cropped_img_white = imagecropauto($original_img , IMG_CROP_WHITE);



// AND



// Use this :

$cropped_img_black = imagecropauto($original_img , IMG_CROP_THRESHOLD, null, 0);

// Rather than :

$cropped_img_black = imagecropauto($original_img , IMG_CROP_BLACK);



?>

2016-07-19 02:49:10

http://php5.kiev.ua/manual/ru/function.imagecropauto.html

Apr 06

Автор: pj dot mueller at protonmail dot ch


I don’t know why you can’t set the threshold for the four sides filter (IMG_CROP_SIDES) so here’s how to do it manually using the IMG_CROP_THRESHOLD filter instead.



$threshold = .5;



$im = imagecreatefromjpeg('somefile.jpg');



$width = imagesx($im);

$height = imagesy($im);



$arr = [

    [0,0],

    [$width-1,0],

    [0,$height-1],

    [$width-1,$height-1],

];



$red = 0;

$green = 0;

$blue = 0;



// grab the colours from all four corners

foreach( $arr as $arr2 ) {

    $thisColor = imagecolorat($im, $arr2[0], $arr2[1]); 



    $rgb = imagecolorsforindex($im, $thisColor); 

    $red += round(round(($rgb['red'] / 0x33)) * 0x33); 

    $green += round(round(($rgb['green'] / 0x33)) * 0x33); 

    $blue += round(round(($rgb['blue'] / 0x33)) * 0x33); 

}



// and average them

$red /= 4;

$green /= 4;

$blue /= 4;



$newColor = imagecolorallocate($im, $red, $green, $blue);            



$cropped = imagecropauto($im, IMG_CROP_THRESHOLD, $threshold, $newColor);



imagejpg($cropped, 'somefile.cropped.jpg');



imagedestroy($im);

imagedestroy($cropped);