imagecropauto

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

imagecropauto — Recorta una imagen automáticamente usando uno de los modos disponibles

Descripción

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

Advertencia

Esta función no está documentada actualmente, solamente se encuentra disponible la lista de parámetros.

Parámetros

image: Un recurso image, es devuelto por una de las funciones de creación de imágenes, como imagecreatetruecolor().
mode: Una de las constantes IMG_CROP_*.
threshold: Usado en modo IMG_CROP_THRESHOLD.
color: Usado en modo IMG_CROP_THRESHOLD.

Valores devueltos

Devuelve el recurso de la imagen recortada en caso de éxito o false en caso de error.

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User Contributed Notes 2 notes

down

raphael.deiana ¶

8 years ago

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);

?>

down

pj dot mueller at protonmail dot ch ¶

2 years ago

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);

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