Rename files in image set to simple numbers in a single folder with hash based deduplication (mostly for packing to zip files).

rename-files-for-image-set.ps1

# Specify the source directory containing the images
$srcDir = ".\src"

# Specify the destination directory to move the renamed images to
$destDir = ".\dest"

# Get all image files in the source directory and its subfolders
$imageFiles = Get-ChildItem -Path $srcDir -Recurse -Include *.jpg,*.jpeg,*.png,*.gif,*.bmp | Sort-Object @{Expression={[regex]::Match($_.Name, '(\d+)').Groups[1].Value.PadLeft(10,'0')}},FullName

# Get the number of digits needed to represent the count of files in $imageFiles
$width = $imageFiles.Count.ToString().Length

# Initialize a hashtable to store file hashes and their corresponding file paths
$hashTable = @{}

# Initialize a counter variable to keep track of the renamed files
$count = 1

# Loop through each image file and rename it with an incremental number
foreach ($file in $imageFiles) {
    # Calculate the hash of the file using the SHA256 algorithm
    $hash = Get-FileHash -LiteralPath "$($file.FullName)" -Algorithm SHA256 | Select-Object -ExpandProperty Hash

    # If the hash already exists in the hashtable, delete the file
    if ($hashTable.ContainsKey($hash)) {
        Write-Host "Skipping duplicate file: $($file.Name), skip" -ForegroundColor Yellow
        continue;
    }
    # Construct the new filename with the incremental number and file extension
    $newFilename = "{0:D$width}{1}" -f $count, $file.Extension

    # Construct the full path of the new file in the destination directory
    $newFilePath = Join-Path -Path $destDir -ChildPath $newFilename

    # Rename the file and move it to the destination directory
    Copy-Item -Path $file.FullName -Destination $newFilePath

    # Increment the counter variable
    $count++
}