image2wbmp – Output Image as WBMP in PHP

image2wbmp() creates a WBMP file from an image resource, optionally saving to a filename or outputting directly to the browser.

Parameters:

$image (resource) – image resource created by functions such as imagecreatetruecolor() or imagecreatefrompng().

$filename (string, optional) – destination file name; if omitted, the image is sent directly to the output stream.

$threshold (int, optional) – threshold value for converting to black‑and‑white.

Return value: Returns true on success or false on failure.

Example:

<?php
$file = 'php.jpg';
$image = imagecreatefrompng($file);
header('Content-type: ' . image_type_to_mime(IMAGETYPE_WBMP));
image2wbmp($image);
?>

The example loads a PNG image, sets the appropriate Content‑type header for WBMP, and outputs the WBMP image directly.