ImageMagick PNG Resize Increases File Size

I am resizing images using ImageMagick. If I pass a -resize WxH option it behaves as expected. But if I pass -resize WxH! (to ignore aspect ratio during resize), some images, especially PNGs, are actually increasing in size. A 200k image becomes 450k, a 170k image becomes 360k and so on.

Any ideas why this is hapenning and how to fix it?

Thanks

How do I resize an image in ImageMagick?

To resize an image to specific dimensions, use the convert command with an input file, the -resize parameter, your preferred dimensions, and an output filename: convert original. png -resize 100x100 new. png.

Is ImageMagick good?

If you're not sure what ImageMagick is, it's one of the greatest tools you could have on your computer, to manipulate images and a few other types of files.

After researching, I upgraded my ImageMagick version from 6.3.7 to 6.5.6, and now it is working great. Resizing images is generating smaller images and everything is OK.