Score:1

Ubuntu

how to find all pictures with a certain aspect ratio in a directory and its subdirectories

Usermaxn

6/23/24, 2:00 AM

I need a method to find all pictures with a certain aspect ratio, for example 16:9 , such as 1920x1080 1280x720 944x531.

I found this page How to find all images with a certain pixel size using command line? but it only says how to find certain sizes not aspect ratios.

I use bash.

1 + 2

command-line

image-processing

Marco

6/23/24, 5:16 AM

Divide the sizes to get the aspect ratio? landscape: 16/9 = 1.77... and in portrait: 9/16=0.5625.

Usermaxn

6/25/24, 1:27 AM

how do I divide the sizes in command line and how do I pass the result of the check to grep? maybe I should make it a function and have it have a if statement

Score:2

Ubuntu

Marco

6/25/24, 4:28 AM

You can modify the command from your link
How to find all images with a certain pixel size using command line?

This will print filenames with pictures approximatly landscape 16/9:

find . -iname "*.jpg" -type f -exec identify -format '%w %h %i\n' '{}' \; | awk '$1/$2>1.7 && $1/$2<1.8 {print $3}'

This will do the same with approximatly portrait 9/16:

find . -iname "*.jpg" -type f -exec identify -format '%w %h %i\n' '{}' \; | awk '$1/$2>0.5 && $1/$2<0.6 {print $3}'

Of course you can use the math in awk in more sophisticated way (for better reading only the awk part):

awk 'sqrt((($1/$2)-(16/9))^2)<sqrt(0.5^2) {print $3}'

As awk has no "abs" function, I just use created it using "^2" and "sqrt" to check if the ratio is inside a "delta" (in this example 0.5).

+ 5

Usermaxn

7/10/24, 4:11 PM

this has a bug. the format has to be `-format '%w %h %i\n'`

Usermaxn

7/10/24, 4:18 PM

and also it only prints upto first space in the name. it works otherwise.

Usermaxn

7/10/24, 4:26 PM

a good fix for that is {print substr($0, index($0,$3)) }

Marco

7/10/24, 4:33 PM

Thanks, updated it.

Usermaxn

7/10/24, 5:07 PM

even better way to print the name in full if it has spaces: `{$1=$2=""; print $0}` instead of `{print $3}`

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