The code is a pair of scripts, one for Windows and one for Unix/Linux, that use image conversion tools to process multiple image file types in bulk. The scripts convert images to various formats, resize and scale them, and apply enhancements to create final images with a consistent ".jpg" format.

Cell 2

#windows
# for /r %%v in (*.pcx or *.jpg or *.jpeg) do convert -colorspace RGB "%%v" "%%~dpv%%~nv.tga" ; done
#

#/bin/bash
find /Users/briancullinan/jupyter_ops/.output -iname '*.jpeg' -o -iname '*.jpg' -o -iname '*.heic' -o -iname '*.tga' -o -iname '*.png' -o -iname '*.svg' -o -name '*.webp' -o -name '*.wal' | \
while IFS= read -r i; do \
o="${i%.*}"; \
o="${o%-final*}-final.jpg"; \
if [ ! -f "$o" ]; \
then convert -density 600 "$i" -resize "600^<" -scale 50% "$o" || true && \
    convert "$o" +clone -enhance -despeckle -alpha on -channel alpha -evaluate multiply 0.25 -composite -quality 50% "$o" || true; \
fi; \
done;

echo "done"

#!/bin/bash

# Define the input directory and the output directory
INPUT_DIR="/Users/briancullinan/jupyter_ops/.output"
OUTPUT_DIR="${INPUT_DIR}/converted"

# Create the output directory if it does not exist
mkdir -p "${OUTPUT_DIR}"

# Define the file extensions to be processed
FILE_EXTENSIONS=(jpeg jpg heic tga png svg webp wal)

# Use find to locate all files in the input directory with the specified extensions
for i in $(find "${INPUT_DIR}" -type f -name "*.*" -print0 | xargs -0 -I {} basename {}); do
    # Extract the filename and extension from the file path
    filename="${i%.*}"
    extension="${i##*.}"

    # Check if the file extension is in the list of supported extensions
    if [[ " ${FILE_EXTENSIONS[@]} " =~ " ${extension} " ]]; then
        # Construct the output filename
        output_filename="${filename%-final*}-final.jpg"

        # Construct the output file path
        output_file_path="${OUTPUT_DIR}/${output_filename}"

        # Check if the output file already exists
        if [! -f "${output_file_path}" ]; then
            # Use ImageMagick to convert the file to RGB and resize it
            convert -density 600 "${i}" -resize "600^<" -scale 50% "${output_file_path}" || true

            # Use ImageMagick to apply image enhancement and cleanup
            convert "${output_file_path}" +clone -enhance -despeckle -alpha on -channel alpha -evaluate multiply 0.25 -composite -quality 50% "${output_file_path}" || true
        fi
    fi
done

echo "done"

Breakdown of the Code

Section 1: Windows Batch Script

# Windows
# for /r %%v in (*.pcx or *.jpg or *.jpeg) do convert -colorspace RGB "%%v" "%%~dpv%%~nv.tga" ; done

• This script uses the Windows for loop to iterate over files with .pcx, .jpg, and .jpeg extensions in the current directory and its subdirectories.
• The convert command is used to convert these images to the RGB colorspace and output to .tga files.

Section 2: Unix/Linux Bash Script

#/bin/bash
find /Users/briancullinan/jupyter_ops/.output -iname '*.jpeg' -o -iname '*.jpg' -o -iname '*.heic' -o -iname '*.tga' -o -iname '*.png' -o -iname '*.svg' -o -name '*.webp' -o -name '*.wal' | \
while IFS= read -r i; do \
o="${i%.*}"; \
o="${o%-final*}-final.jpg"; \
if [! -f "$o" ]; \
then convert -density 600 "$i" -resize "600^<" -scale 50% "$o" || true && \
    convert "$o" +clone -enhance -despeckle -alpha on -channel alpha -evaluate multiply 0.25 -composite -quality 50% "$o" || true; \
fi; \
done;

echo "done"

• This script uses the find command to locate files with various image extensions in the specified directory and its subdirectories.
• The script then loops through the found files and performs the following operations:
  1. Extracts the filename without extension and appends "-final.jpg" to it.
  2. If the file does not already exist, it uses the convert command to:
     a. Resize the image to 600 pixels or less on the longest side.
     b. Scale the image to 50% of its original size.
     c. Enhance the image, remove speckles, and adjust the alpha channel.
  3. The script outputs "done" after completing the loop.