Crop -- resize camera pics?

[jessejazza2]

I'd be grateful for some advice on resizing camera pics.

So far each camera I have used takes pics in 4:3 ratio. That's been fine as mogrify 50% has given me 800x600 which is ideal for forums, emails etc.

My new android phone seems to do 4128x2322 while the tablet conveniently stays with 4:3. So I want to presumably crop to 4:3 ratio but not sure how to set IM to do it. Resizing alters the aspect ratio which I don't want.

thanks (probably quite simple and I'm just dim!)

[vonbiber]

I would do this

Code: Select all

convert input_image -auto-orient -thumbnail '800x600>' output_image

[GeeMack]

My new android phone seems to do 4128x2322 while the tablet conveniently stays with 4:3. So I want to presumably crop to 4:3 ratio but not sure how to set IM to do it. Resizing alters the aspect ratio which I don't want.

First I'd check to see if your phone has a setting to take the photos in a 4:3 format. The 4128x2322 image is a 16:9 ratio commonly used for HD video, and the phone surely should let you change that to a 4:3 photo aspect (and maybe a 3:2 aspect, too). But whatever the dimensions of your original, ImageMagick can easily modify your photo sizes a few different ways.

You can force a resize to any particular dimensions, but the result of simply changing a 16:9 aspect ratio to a 4:3 ratio would be quite distorted.

You could crop some amount off the left and right sides of the original to make it 4:3, then do your resizing. That would preserve the entire height but remove some of the width from the original.

Or you could add a black (or any color) top and bottom border to pad the image up to 4:3. That would preserve the entire image, but add a pretty substantial strip of color to both horizontal edges.

The exact methods would require you to provide the version of ImageMagick you're using and which operating system you're working on.

[jessejazza2]

Oh first reply did not seem to work.

Many thanks - yes there is a setting for 4:3 on the phone. Apologies I didn't notice... the tablet only does 1600x800 and so I assumed one couldn't change it.