The imagecropauto() function is an inbuilt function in PHP which is used to crop an image automatically using one of the available modes.
Syntax:
resource imagecropauto( resource $image, int $mode,
float $threshold, int $color )
Parameters: This function accepts four parameters as mentioned above and described below:
- $image: It specifies the image resource to be cropped.
- $mode (Optional): It specifies an integer corresponding to a crop mode.
List of CROP modes are given below:
- IMG_CROP_DEFAULT (0)
- IMG_CROP_TRANSPARENT (1)
- IMG_CROP_BLACK (2)
- IMG_CROP_WHITE (3)
- IMG_CROP_SIDES (4)
- IMG_CROP_THRESHOLD (5)
- $threshold (Optional): It specifies the tolerance in percent to be used while comparing the image color and the color to crop.
- $color (Optional): It specifies either an RGB color value or a palette index.
Return Value: This function returns TRUE on success.
Exceptions: This function throws Exception on error.
Below given programs illustrate the imagecropauto() function in PHP:
Program 1:
<?php   // Load the png image $im = imagecreatefrompng(    // Crop the extra white area $cropped = imagecropauto($im, IMG_CROP_WHITE);   // Convert it to a png file header('Content-type: image/png');  imagepng($cropped); ?> |
Output:
Program 2:
<?php   // Load the png image $im = imagecreatefrompng(    // Crop the image $cropped = imagecropauto($im, IMG_CROP_BLACK);   // Convert it to a png file header('Content-type: image/png');  imagepng($cropped); ?> |
Output:
Reference: https://www.php.net/manual/en/function.imagecropauto.php
