CODEWITHSUNDEEP
php
Keverw
Keverw

Reputation: 3786

Why is this creating a black image?

In the images folder i have a notfound.php file with

<?php
header('Content-type: image/png');
    $im = imagecreatefrompng('simnotfound.png');
    imagepng($im);
    imagedestroy($im);
    ?>

The image is a 256 by 256. The notfound.php page shows a black 256 by 256 square. The image is not all black tho. Its just some black text on a transparent background in the center.

The fix is

<?php
header('Content-type: image/png');
    $im = imagecreatefrompng('simnotfound.png');
    imagealphablending($im, true); // setting alpha blending on
    imagesavealpha($im, true); // save alphablending setting (important)
    imagepng($im);
    imagedestroy($im);
    ?>

Upvotes: 2

Views: 1583

Answers (2)

iGseef
iGseef

Reputation: 11

bool imagesavealpha ( resource $image , bool $saveflag )

imagesavealpha — Set the flag to save full alpha channel information (as opposed to single-color transparency) when saving PNG images

Upvotes: 1

bensiu
bensiu

Reputation: 25554

create your image file one more time with white background to check that is read correctly, if yes - problem is your transparent background

also try with other file to eliminate problem with reading this specific file

Upvotes: 3

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