Php – TCPDF: PNG image rendered incorrectly

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I'm working on a project which involves TCPDF. I've been working with it for a while now but, after the last update (6.0) my PNG images get really broken although its fragments still visible on the document.

I'm using the Image() method as follows:
$pdf->Image($img, $x, $y, $twidth, $theight);

where $img is the source URL, $x and $y the position and $twidth and $theight the size.
I've tested GIF and JPG and it works just fine. There is a GIF image on the PDF to prove that. The PNG image is the VLC icon logo.

The image:

enter image description here

Best Answer

From the project site, to a user who had a similar problem:

Probably you have problems with PNG images with transparency that are handled in different way depending on the php-imagick or php-gd version used. Try to update php-imagick and disable php-gd

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Javascript – Capture HTML Canvas as gif/jpg/png/pdf

Oops. Original answer was specific to a similar question. This has been revised:

var canvas = document.getElementById("mycanvas");
var img    = canvas.toDataURL("image/png");

with the value in IMG you can write it out as a new Image like so:

document.write('<img src="'+img+'"/>');

Replace transparency in PNG images with white background

-background white -alpha remove -alpha off

Example:

convert image.png -background white -alpha remove -alpha off white.png

Feel free to replace white with any other color you want. Imagemagick documentation says this about the -alpha remove operation:

This operation is simple and fast, and does the job without needing any extra memory use, or other side effects that may be associated with alternative transparency removal techniques. It is thus the preferred way of removing image transparency.

Best Answer

Related Solutions

Javascript – Capture HTML Canvas as gif/jpg/png/pdf

Replace transparency in PNG images with white background

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