#!/bin/bash

MAX_CONCURRENT_JOBS=25 
CURRENT_JOBS=0

# Using find to handle large number of files more robustly
find . -maxdepth 1 -name "*.tiff" -print0 | while IFS= read -r -d $'\0' i; do
    (
        e2proc2d.py "${i}" "${i/tiff/png}" --meanshrink=4 --average && \
        e2proc2d.py "${i/tiff/png}" "${i/tiff/jpg}" --fixintscaling sane
    ) &

    CURRENT_JOBS=$((CURRENT_JOBS+1))

    if (( CURRENT_JOBS >= MAX_CONCURRENT_JOBS )); then
        wait -n
        CURRENT_JOBS=$((CURRENT_JOBS-1))
    fi
done

wait
echo "All files processed."