Resize images based on their orientation

[aamir4774@gmail.com]

Hi ImageMagick Community,

I have got a requirement to resize the JPEG, TIFF, EPS and PNG image formats as per their orientation and later convert them to JPEG. I want to know if there's a way using ImageMagick by which we can find if the orientation of the image is "landscape" or "portrait". As the requirement is to resize the height of the image in case of portrait images and to resize width in case of landscape ones. Currently I'm using the below code to do so:

For Portrait I'm changing the resolution to 2048px and pixel density to 72dpi as below.

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convert -units PixelsPerInch <input_file> -density 72 -resize x2048 <output_file.jpeg>

And for Landscape images similar thing but for width:

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convert -units PixelsPerInch <input_file> -density 72 -resize 2048 <output_file.jpeg>

To sum up I just want a single command to resize height in case of portrait and width in case of landscape images, your suggestions/help will be held in high regards.

[fmw42]

No need for any orientation test. You can just use:

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convert -units PixelsPerInch <input_file> -density 72 -resize 2048x2048 <output_file.jpeg>

That should take the largest dimension of your image and make that 2048. The other dimension will be in proportion to the aspect ratio. So if the image is landscape the width will become 2048 and the height will be less. If portrait, the height will become 2048 and the width will be less.

See https://imagemagick.org/script/command- ... p#geometry

[aamir4774@gmail.com]

Thanks Fred, this worked like a charm.
My requirement has got a bit changed, the output file should be less than 2Mb and I'm using the below command to do it:

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convert -quiet -units PixelsPerInch <input> -define jpeg:extent=2048kb -scale 50% -density 72 -resize 2048x2048 <output>

This is working fine for major of the formats but for "TIF" files the output size is more than that of the specified.

[snibgo]

What compression are you using for your TIF? If none, you might use "-compress JPEG", perhaps with a quality setting, but this will be lossy.

[aamir4774@gmail.com]

Snibgo, I'm using the entire command, which I have posted in my recent comment. Do I need to append "-compress" attribute to it? If yes how that can be done along with a quality setting?

[snibgo]

You could add compression and quality like this:

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convert -quiet -units PixelsPerInch <input> -scale 50% -density 72 -resize 2048x2048 -compress JPEG -quality 50 <output>

I removed "-define jpeg:extent=2048kb" because it has no effect when writing TIFF files.

[aamir4774@gmail.com]

Hi Snibgo,

This command didn't helped, the output file size remained somewhat in the similar range to that of we were getting using the earlier command.

[snibgo]

What type of images are they? JPEG compression was designed for photos. We can give better advice if you supply a link to a sample input.

[aamir4774@gmail.com]

Not sure if I can actually share the image with you, but sharing below its properties. Also, one thing I did noticed that the converted jpeg gets saved under a megabit or two when we open it using photoshop and try "save As" option.

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