reduce_image_sizes_recursively.ps1

# Set the desired quality for image compression
$quality = 75
# Set the maximum dimensions for resizing while preserving the aspect ratio
$maxDimension = "1920x1920>"
# Set the minimum file size for resizing and compression (500KB)
$minFileSizeForResize = 500 * 1024

# Function to get the date taken from the image's EXIF data
function Get-DateTaken {
    param([string]$imagePath)

    # Get the DateTimeOriginal and DateTime values from the image's EXIF data
    $dateTakenInfo = magick identify -format "%[EXIF:DateTimeOriginal]|%[EXIF:DateTime]" $imagePath
    $dateTimeOriginal, $dateTime = $dateTakenInfo -split '\|'

    # Try to parse DateTimeOriginal, if available
    if ($dateTimeOriginal) {
        try {
            return [DateTime]::ParseExact($dateTimeOriginal, "yyyy:MM:dd HH:mm:ss", $null)
        } catch {
            return $null
        }
    # If DateTimeOriginal is not available, try to parse DateTime
    } elseif ($dateTime) {
        try {
            return [DateTime]::ParseExact($dateTime, "yyyy:MM:dd HH:mm:ss", $null)
        } catch {
            return $null
        }
    }

    # If neither DateTimeOriginal nor DateTime is available, return null
    return $null
}

# Get all .jpg and .jpeg files in the current directory and its subdirectories
Get-ChildItem -Path . -Include *.jpg, *.jpeg -Recurse | ForEach-Object {
    Write-Host "Processing $($_.FullName)"

    # Get the date taken from the image's EXIF data
    $dateTaken = Get-DateTaken $_.FullName

    # If the date taken is not available, use the file's last write time
    if (-not $dateTaken) {
        $dateTaken = $_.LastWriteTime
    }

    # If the file size is larger than the minimum file size for resizing and compression
    if ($_.Length -gt $minFileSizeForResize) {
        # Create a temporary file path for the compressed image
        $compressedImagePath = "$($_.DirectoryName)\compressed_$($_.Name)"
        # Resize and compress the image
        magick convert $_.FullName -resize $maxDimension -quality $quality $compressedImagePath
        # Remove the original image
        Remove-Item $_.FullName
        # Rename the compressed image to the original file name
        Rename-Item $compressedImagePath $_.Name
    }

    # Check if the file's date is already correct before updating it
    if ((Get-Item $_.Name).LastWriteTime -ne $dateTaken) {
        # Update the file date with the date taken
        (Get-Item $_.Name).LastWriteTime = $dateTaken
    }

    Write-Host "Completed $($_.FullName)"
}