Mass deletion of PNG files smaller than a certain size (pixels, not bytes)

[TechEnjoyer]

So basically, I recovered a lot of files from an external HDD and now have around 250000 PNG files. And now the problem I am facing is that there are a lot of textures from Minecraft texture packs and Windows applications mix in because the recovery program didn't restore the folder structure. And now I am trying to find a tool to mass delete them when they have a certain size, e.g., 64x64 or 1024x1024. I'd prefer a Linux command line tool, but It's not so important. Thank you in advance.

 

[Eigenvektor]

Here's a small shell script that should do what you want. Not quite a one liner, but should be easy enough to adjust as needed. Requires ImageMagick to be installed.

#!/bin/sh

IMAGE_PATH=.
IMAGE_TYPE=*.png

find $IMAGE_PATH -type f -name $IMAGE_TYPE | while read IMAGE_FILE; do
    IMAGE_SIZE=$(identify -format '%w %h' $IMAGE_FILE)

    IMAGE_WIDTH=$(echo $IMAGE_SIZE | awk {'print $1'})
    IMAGE_HEIGHT=$(echo $IMAGE_SIZE | awk {'print $2'})

    if (($IMAGE_WIDTH < 1024 && $IMAGE_HEIGHT < 1024)); then
        echo "$IMAGE_FILE is $IMAGE_WIDTH x $IMAGE_HEIGHT"
        # TODO - DELETE FILE HERE
    fi
done

 

[rednoah]

filebot -find will work on all platforms provided you don't mind installing filebot first.

 

e.g. find *.png files where the image height is 1024px:

filebot -find /input --filter "ext == /png/ && height == 1024"

 

e.g. find *.png files where the image height is 1024px and delete them:

filebot -find /input --filter "ext == /png/ && height == 1024" -exec rm -v {}

 

[TechEnjoyer]

@rednoah @Eigenvektor  Thank you both for the quick responses. Unfortunately, I only had the last few days to do it and was only able to try your solution. Unfortunately, I have to say that both of them didn't work for me. I installed both file bot (over apt) and image magic (also over apt). With your script, @Eigenvektor , I got the following ERROR :
./DelIMG.sh: 12: cannot open 1024: No such file
And with your command, @rednoah , I got the following ERROR:
Bad system encoding: ANSI_X3.4-1968
* Please configure your locale with LANG=C.UTF-8 or LANG=en_US.UTF-8
File does not exist: /input
 

[Eigenvektor]

43 minutes ago, TechEnjoyer said:

@Eigenvektor , I got the following ERROR :
./DelIMG.sh: 12: cannot open 1024: No such file

Please try again with this version… I forgot to add quotes around the variables containing paths/files names, which works fine if it contains no blanks, but breaks if it does. This should hopefully work as expected:

#!/bin/sh

IMAGE_PATH=.
IMAGE_TYPE=*.png

find "$IMAGE_PATH" -type f -name "$IMAGE_TYPE" | while read "IMAGE_FILE"; do
    IMAGE_SIZE=$(identify -format '%w %h' "$IMAGE_FILE")

    IMAGE_WIDTH=$(echo $IMAGE_SIZE | awk {'print $1'})
    IMAGE_HEIGHT=$(echo $IMAGE_SIZE | awk {'print $2'})

    if (($IMAGE_WIDTH < 1024 && $IMAGE_HEIGHT < 1024)); then
        echo "$IMAGE_FILE is $IMAGE_WIDTH x $IMAGE_HEIGHT"
        # TODO - DELETE FILE HERE
    fi
done

 

~edit: Rather than delete the files, another idea might be to create a directory based on the resolution and move the files there. This way you can at least examine them before deletion.

 

~edit: #2 This rounds the image size to the nearest multiple of 32, then moves it into the appropriate directory/bucket

Spoiler

#!/bin/sh

IMAGE_PATH=.
IMAGE_TYPE=*.png
NEAREST_MULTIPLE=32

HALF_MULTIPLE=$((NEAREST_MULTIPLE / 2))
find "$IMAGE_PATH" -type f -name "$IMAGE_TYPE" | while read "IMAGE_FILE"; do
    IMAGE_SIZE=$(identify -format '%w %h' "$IMAGE_FILE")

    # Separate width and height
    IMAGE_WIDTH=$(echo $IMAGE_SIZE | awk {'print $1'})
    IMAGE_HEIGHT=$(echo $IMAGE_SIZE | awk {'print $2'})

    # Round to nearest
    (( BUCKET_WIDTH = (IMAGE_WIDTH + HALF_MULTIPLE) / NEAREST_MULTIPLE, BUCKET_WIDTH *=NEAREST_MULTIPLE ))
    (( BUCKET_HEIGHT = (IMAGE_HEIGHT + HALF_MULTIPLE) / NEAREST_MULTIPLE, BUCKET_HEIGHT *=NEAREST_MULTIPLE ))

    OUTPUT_PATH="restore/${BUCKET_WIDTH}x${BUCKET_HEIGHT}"
    SOURCE_NAME=$(basename "${IMAGE_FILE}")

    echo "copy $SOURCE_NAME to $OUTPUT_PATH"
    mkdir -p "$OUTPUT_PATH"
    mv "$IMAGE_FILE" "$OUTPUT_PATH"
done

 

 

[rednoah]

On 1/1/2024 at 6:44 PM, TechEnjoyer said:

File does not exist: /input
 

We use /input as a placeholder for your actual input file path in the example above. Looks like you did a blind copy & paste without changing the input file path placeholder to a real file path.

 

 

e.g. use real path . to process files in the current working directory:

filebot -find . --filter "ext == /png/ && height == 1024"

e.g. use real path /home/TechEnjoyer/MinecraftTexturePacks to process files in that directory:

filebot -find "/home/TechEnjoyer/MinecraftTexturePacks" --filter "ext == /png/ && height == 1024"

The two commands here will list files (and not delete files) so run those first, see if it looks good, then add -exec rm -v {} at the end as seen in my previous post to actually delete files.

 

 

 

TIP: You'll want to add export LANG=en_US.UTF-8 to your .profile (the script code that is automatically called by your shell on startup) if you want your shell (and programs executed by your shell) to work with UTF-8 as file system encoding. Your environment is set to ASCII file system encoding, so you will run into trouble when you encounter non-ASCII file paths. Read https://unix.stackexchange.com/a/667863/78608 for details.

[TechEnjoyer]

I am very sorry @rednoah and @Eigenvektor for not responding. I really appreciated your help, unfortunately I was very busy the last few months and forgot to reply. Fortunately, I found a backup of the HDD so I didn’t have to do it in the end. And again I am very great full for your help.