Imagemagick: Convert to fixed height, proportional width

imageimagemagick

Using Imagemagick, I'd like to convert a batch of PNGs to a fixed height of 1080px and a proportional width. With proportional I mean this: If the original Image is scaled down 16.8% to 1080px, the width also needs to be scaled down by 16.8%.

Any way of using convert without having to calculate the exact geometry before (using identify and some bash calculation shenanigans) ?

Best Answer

Try this:

convert -resize x1080 {from_path} {to_path}

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Javascript – How to get image size (height & width) using JavaScript

You can programmatically get the image and check the dimensions using Javascript...

const img = new Image();
img.onload = function() {
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}
img.src = 'http://www.google.com/intl/en_ALL/images/logo.gif';

This can be useful if the image is not a part of the markup.

Imagemagick: Convert to fixed width, proportional height

Use -resize 100x to resize images to 100 pixels in width while maintaining the height's aspect ratio.

Read the fine ImageMagick manual for details.

Best Answer

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Javascript – How to get image size (height & width) using JavaScript

Imagemagick: Convert to fixed width, proportional height

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