How to resize image with imagick php

Question

With imagick command, i want to resize image form 2Mb to 200KB, i tried:

convert a.jpg -strip -define jpeg:extent=200k a1.jpg

And it work. But i want to use imagick function of php to resize blob image.

Php's documentation regarding the resizeImage method require width and height.

How can resize blob image from 2Mb to 200Kb like the command line above.

I tried:

    $imageBlob = file_get_contents('a.jpg');
    $image = new \Imagick();
    $image->readImageBlob($imageBlob);
    $height = $image->getImageHeight();
    $width = $image->getImageWidth();
    $image->resizeImage( $width, $height,  \Imagick::FILTER_LANCZOS, 1 );
    $finfo = finfo_open(FILEINFO_MIME_TYPE);
    $mime = finfo_buffer($finfo, $image->getImageBlob());
    $mime == "image/svg" && $mime.= "+xml";
    $base64 =  "data:$mime;base64," . base64_encode($image->getImageBlob());
    echo "<img src=\"".$base64.'">';die;

But this doesn't reduce the size from 2Mb to 200Kb

The command-line command you show does not decrease the image size to 200kB. It resizes the image to be 200 pixels wide. — Mark Setchell
– Mark Setchell, Commented Apr 27, 2021 at 11:58
To resize to a particular file size for JPG only, see -define jpeg:extent at legacy.imagemagick.org/Usage/formats/#jpg_write — fmw42
– fmw42, Commented Apr 27, 2021 at 15:45
@ fmw42, i want to use Imagick of Php to resize it, instead of command — The Manh Nguyen
– The Manh Nguyen, Commented Apr 28, 2021 at 2:50

Mark Setchell · Accepted Answer · 2021-04-28 06:22:46Z

2

I have not tested this, but am fairly sure you can use setOption like this to set the upper limit for a JPEG's filesize:

$imagick->setOption('jpeg:extent', $extent);

answered Apr 28, 2021 at 6:22

Mark Setchell

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