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Supports: RW2
RW2 is Panasonic's proprietary RAW image container, used across the Lumix G (Micro Four Thirds), Lumix S (full-frame L-mount), Lumix FZ bridge, and Lumix LX compact lines. It is TIFF-based, stores 12-bit or 14-bit sensor data, embeds a full-size JPEG preview, and ranges from roughly 15 MB on older 16 MP bodies up to 30 MB+ on the 47 MP Lumix S1R. The files are wonderful to edit but useless for sharing — most browsers, phones, and chat apps can't render a single RW2, let alone a sequence. Wrapping them in MP4 makes them play anywhere a video plays.
| Property | RW2 (Panasonic RAW) | MP4 (H.264/H.265) |
|---|---|---|
| Type | Single-image RAW container | Video container |
| Base format | TIFF-based | ISO base media (MPEG-4 Part 14) |
| Color data | 12-bit or 14-bit per channel, sensor-native | 8-bit per channel (10-bit with HEVC Main10) |
| File size | 15–30+ MB per still | A whole reel often smaller than one RW2 |
| Playback | Lightroom, Capture One, RawTherapee, darktable; not browsers or phones | Universal — every browser, phone, smart TV, console |
| Best use | Editing, white-balance and exposure recovery | Sharing, embedding, streaming, social |
| Compression | Lossless (or slightly lossy on newer bodies) | Lossy inter-frame (H.264/265/AV1) |
| Option | Default | What it controls |
|---|---|---|
| Video Codec | H.264 | H.264 = universal playback. H.265/HEVC = ~40–50% smaller at the same visual quality; supported by iOS 11+, macOS High Sierra+, Windows 10+ with the HEVC extension, and Chrome/Edge/Safari (Firefox via OS decoder). AV1 = smallest files but slowest to encode and decode. MPEG-4 Part 2/Xvid is legacy compatibility only. |
| Quality Preset | Very High | Preset shortcut for CRF/bitrate. Very High ≈ CRF 20 for H.264, Highest ≈ CRF 17 (visually lossless). |
| Constant Quality (CRF) | 23 (H.264) / 28 (H.265) | Lower = better quality and bigger file. CRF 18 for H.264 is the "visually lossless" sweet spot; CRF 23 is the libx264 default; CRF 28 for H.265 matches CRF 23 for H.264. |
| Resolution | Keep original | Use Preset Resolutions for standard sizes (2160p/1080p/720p). Custom Width × Height respects aspect ratio if "Keep aspect ratio" is checked. |
| Background Color | Black | Letterbox/pillarbox fill when the RW2 aspect ratio (often 4:3 on Lumix G bodies, 3:2 on S bodies) doesn't match the chosen output. White reads better for product photography; black for cinematic. |
| Audio Codec | AAC | RW2 has no audio, so AAC is added as a silent track for maximum player compatibility. |
RW2 is the RAW format across the Lumix DMC line (introduced with the GH-series Micro Four Thirds bodies in 2008 — earlier Lumix bodies used .RAW), continuing through the current Lumix G, GH, GF, GX, FZ, LX, and full-frame Lumix S series. Leica's M Monochrom and certain Leica D-Lux/V-Lux models also write RW2 because their imaging pipeline is co-developed with Panasonic. The Sigma fp uses .DNG (an open Adobe format), so its files are not RW2 — convert those via DNG to MP4.
Set Duration to 1/24s, 1/30s, or 1/60s — each RW2 becomes one frame of the output video at that frame rate. A 720-frame Lumix S5 interval shoot at 1/24s = a 30-second 24 fps clip; at 1/30s = 24 seconds at 30 fps. Use Merge Strategy "Merge images" so the whole sequence renders into one MP4. Upload the files in shutter order — file-name sort is normally identical, but check before kicking off a long batch.
It applies a baseline demosaic from the RW2's embedded preview and sensor data — enough for a clean slideshow or time-lapse but not equivalent to a Lightroom or Capture One develop. If you've already invested in per-frame edits (graduated filters, exposure ramps, white-balance shifts), export to JPEG/TIFF/PNG from your RAW developer first and feed those into the converter — the timing and codec controls are identical. For deeper RAW work, convert RW2 to JPG at quality 100 first.
The image gets letterboxed (or pillarboxed) with the Background Color filling the unused frame area. A 4:3 G9 RAW (5184×3888) inside a 1080p (1920×1080) frame becomes a 1440×1080 image centered with 240px black bars left and right. To avoid bars, pick the 2160×1620 or 1440×1080 custom dimensions, or change Background Color to white for product shots.
Because each frame originates from a multi-megabyte RAW with no inter-frame compression help (the codec can't exploit temporal redundancy between unrelated still photos as well as it does for video). Switching the codec to H.265 (HEVC) typically cuts size 40–50% vs H.264 at the same CRF. For aggressive shrink, set Constant Quality (CRF) to 26–28 on H.264 or 30–32 on H.265.
Pick H.264 if the file will be emailed, embedded on an older CMS, or played on a 2015-era TV — it decodes on every device made in the last decade. Pick H.265/HEVC for archival or upload to a current platform — half the file size at the same quality, and iOS 11+, macOS High Sierra+, Windows 10+ (with the free HEVC extension on older builds), Chrome, Edge, and Safari all decode it natively. AV1 saves another ~20% over HEVC but is slower to encode and isn't yet universal in editors.
Not in this single step — the converter writes a silent AAC audio track for player compatibility. Export the MP4 here first, then drop it into a video editor (DaVinci Resolve, iMovie, or Shotcut are free) to lay an MP3/AAC track over the top. Match the music length to your slideshow by adjusting Duration per frame here before exporting — total runtime = frame count × duration.
For feed posts: 1080×1080 (square) at 30 fps. For Reels/Stories/TikTok: 1080×1920 (vertical) at 30 fps. Set Duration to 1/30s for a true 30 fps time-lapse, or 2–3 seconds per frame for a slideshow that respects the platforms' typical 60-second cap (15–25 photos at 2–3s each). Background Color "Black" reads cleanly inside both apps' dark UIs.
Confirm the extension is lowercase .rw2; some older Lumix bodies write .RW2 and a few card readers preserve mixed case (the converter accepts both, but custom upload scripts sometimes don't). If your camera writes paired sidecar .RW2.OUT or .XMP files, upload only the .rw2 — sidecars contain edit metadata that the in-browser demosaicer can't apply. Files larger than your browser's per-tab memory ceiling (typically a few GB) may also fail; convert in smaller batches if you hit that.