S9 to S5 Converter

A macOS app that converts Lumix S9 RW2 raw files for Capture One Pro 23 compatibility.

The Problem

Capture One Pro 23 doesn't support the Panasonic Lumix S9 camera. However, it does support the Lumix S5, which uses a nearly identical sensor and raw format.

The Solution

This app modifies the EXIF Model tag in RW2 files from "DC-S9" to "DC-S5", allowing Capture One to import and process the files.

Safety Features

• Creates a backup before modifying each file
• Validates the file is a legitimate Lumix S9 RW2 before modification
• Verifies the TIFF structure remains intact after modification
• Confirms file size is unchanged (byte-for-byte same size)
• Automatically restores from backup if any validation fails

Requirements

• macOS 13.0 or later
• Xcode 15+ (to build from source)

Building

1. Clone the repository
2. Open S9ToS5.xcodeproj in Xcode
3. Build and run (⌘R)

Or build from command line:

xcodebuild -project S9ToS5.xcodeproj -scheme S9ToS5 -configuration Release build

The app will be in ~/Library/Developer/Xcode/DerivedData/S9ToS5-*/Build/Products/Release/

Usage

1. Launch the app
2. Click "Choose Folder" and select a folder containing your S9 RW2 files
3. Click "Convert Files"
4. Import the converted files into Capture One