Imagick resizeImage(): What argument to use when not specifying maximum height in imagick?

Question

I'm using imagick 3.7.0 compiled against ImageMagick 7.0.10-23 Q16 x86_64

In previous versions of imagick, I could resize an image with the width specified but the height unlimited using this command, where $width is a specific size but null is intended to mean unlimited for the height:

resizeImage($width, null, imagick::FILTER_LANCZOS, 1);

With the new imagick I've loaded to use PHP 8.1, the null is throwing an error on my server:

Imagick::resizeImage(): Passing null to parameter #2 ($rows) of type int is deprecated

What is the proper argument to supply to the second parameter in this case?

Many thanks!

Answer 1

if you pass $bestFit=true, the image keeps the scale. $width and $height are treated as max-with and max-height. So if you pass a very large $height, the image-size will be limited be the provided $width. For example:

resizeImage($width, 999999, imagick::FILTER_LANCZOS, true);

See: http://www.phpimagick.com/Imagick/resizeImage?width=200&height=500&blur=1&filter_type=Lanczos&crop=Disabled&best_fit=Enabled&image_path=Lorikeet