I have a php script to create jpg thumbnail of pdf as follows;
<?php
$file ="test.pdf";
$im = new imagick(realpath($file).'[0]');
$im->setImageFormat("jpg");
$im->resizeImage(200,200,1,0);
// start buffering
ob_start();
$thumbnail = $im->getImageBlob();
$contents = ob_get_contents();
ob_end_clean();
echo "<img src='data:image/jpg;base64,".base64_encode($thumbnail)."' />";
?>
But the resulting jpg have black background instead of white.. How can I fix this??
None of the previously posted answers worked for me however the below did:
$image = new Imagick;
$image->setResolution(300, 300);
$image->readImage("{$originalPath}[0]");
$image->setImageFormat('jpg');
$image->scaleImage(500, 500, true);
$image->setImageAlphaChannel(Imagick::VIRTUALPIXELMETHOD_WHITE);
As I’m using the Laravel framework I then take the converted image and store it using Laravels filesystem.
Storage::put($storePath, $image->getImageBlob());
Update: So I recently changed OS and whereas this previously worked on my Ubuntu machine on my Mac certain images were still coming out black.
I had to change the script to the below:
$image = new Imagick;
$image->setResolution(300, 300);
$image->setBackgroundColor('white');
$image->readImage("{$originalPath}[0]");
$image->setImageFormat('jpg');
$image->scaleImage(500, 500, true);
$image->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
$image->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
Seems important to set the background colour before reading in the image. I also flatten any possible layers and remove the alpha channel. I feel like I tried ALPHACHANNEL_REMOVE on my Ubuntu machine and it didn’t work so hopefully between these answers readers can find something that works for them.
Answer：
If your version of Imagick is not up to date, the setImageBackgroundColor may be wrong.
Swap the following line
$im->setImageBackgroundColor("red");
to this (Imagick version >= 2.1.0)
$im->setBackgroundColor(new ImagickPixel("red"));
or (Imagick version < 2.1.0)
$im->setBackgroundColor("red");
Answer：
I solved it by;
$im = new imagick(realpath($file).'[0]');
$im->setCompression(Imagick::COMPRESSION_JPEG);
$im->setCompressionQuality(100);
$im->setImageFormat("jpeg");
$im->writeImage("imagename.jpg");
Answer：
Simply adding this prevents the JPG to be created with a black background
-alpha off
Answer：
change this code $im->setimageformat("jpg"); to this code
$im->setimageformat("png"); if you face a background colour issue.
