How can I provide a RGBA png file to OpenAI PHP library

I import Orhanerday\OpenAi library to my DALL-E Examples project but when I provide images, I got Invalid input image - format must be in ['RGBA'], got RGB. error. I search for this error on the internet but I got nothing.

My code looks like

<?php

require __DIR__ . '/vendor/autoload.php'; // remove this line if you use a PHP Framework.

use Orhanerday\OpenAi\OpenAi;

$open_ai_key = getenv("OPENAIKEY");
$open_ai = new OpenAi($open_ai_key);
 
$otter = curl_file_create("C:\Users\dotor\OneDrive\Desktop\dalle-examples\otter.png");
$mask = curl_file_create("C:\Users\dotor\OneDrive\Desktop\dalle-examples\mask.png");

$result = $open_ai->imageEdit([
    "image" => $otter,
    "mask" => $mask,
    "prompt" => "A cute baby sea otter wearing a beret",
    "n" => 2,
    "size" => "256x256",
]);

var_dump($result);

Png files;

otter.png; mask.png;

I need to get a result without any errors, what is an RGBA png file and how can I provide?

Solution

The A in RGBA stands for Alpha, which is simply a value for opacity. Since this is the type needed for OpenAI, you should convert the plain RGB to RGBA leveraging an existing library. In python, I used the Python Image Library (PIL) convert function to complete this task.