Read, write, edit and preview DNG opcodes with live feedback.
Adjust any opcode parameter with a slider and watch the preview image update in real time. Import opcodes from a DNG file or a raw .bin payload, edit them, then export back to either format.
- Live preview of the opcode chain with multi-threaded pixel processing that runs off the UI thread.
- Full coverage of OpcodeList1, OpcodeList2 and OpcodeList3 — each opcode remembers the list it belongs to and is written back to the matching tag.
- No external dependencies — a built-in TIFF/DNG IFD parser replaces the previous ExifTool requirement.
- Direct DNG open for CFA DNGs (Bayer pattern), including Lossless JPEG compressed and tiled layouts, with a built-in bilinear demosaic. LinearRaw DNGs (already demosaiced) and plain RGB TIFFs with LZW or Deflate compression are also supported.
- Metadata panel showing the common EXIF / DNG tags of the loaded image (Make, Model, ISO, exposure, DNG-specific colour-calibration tags, etc.).
- Drag-and-drop any combination of
.tiff,.dngand.binfiles onto the window. - Per-opcode enable / disable, gamma encode/decode toggles, and an "Add Opcode" picker.
- Decoupled Core library — the WPF window is a thin shell on top of a platform-agnostic core.
- One-click "Open DNG (image + opcodes)" — loads the image, clears the current chain, and imports the file's own OpcodeList tags in one go.
- Full DNG tonal pipeline —
BlackLevel+WhiteLevellinearisation, EXIFOrientation,AsShotNeutralwhite balance,ColorMatrixto linear sRGB via the DNG-spec WB diagonal (Bradford D50→D65),BaselineExposure2^stops gain, highlight desaturation (kills the magenta cast in clipped highlights),ProfileHueSatMap,ProfileToneCurve, then sRGB OETF (proper piecewise IEC 61966-2-1, not pow 2.2) — all applied automatically. Toggleable per file. - FHD preview downsample — large DNGs (e.g. 24 MP) are downsampled to 1920x1080 before the opcode chain runs, so editing stays responsive. A "Process at full resolution" checkbox bypasses the resize when you need the real output.
- TPDF-dithered 16→8 display conversion — no banding in smooth gradients on screen. Toggleable via the "Display Dither" checkbox; saved 16-bit TIFFs are unaffected.
- Headless CLI (
dng-opcodes) for scripting opcode list / extract / inject / metadata / preview operations without the GUI.
| ID | Opcode | Read | Write | Preview |
|---|---|---|---|---|
| 1 | WarpRectilinear | ✓ | ✓ | ✓ |
| 2 | WarpFisheye | ✓ | ✓ | ✓ |
| 3 | FixVignetteRadial | ✓ | ✓ | ✓ |
| 4 | FixBadPixelsConstant | ✓ | ✓ | ✓ |
| 5 | FixBadPixelsList | ✓ | ✓ | ✓ |
| 6 | TrimBounds | ✓ | ✓ | ✓ |
| 7 | MapTable | ✓ | ✓ | ✓ |
| 8 | MapPolynomial | ✓ | ✓ | ✓ |
| 9 | GainMap | ✓ | ✓ | ✓ |
| 10 | DeltaPerRow | ✓ | ✓ | ✓ |
| 11 | DeltaPerColumn | ✓ | ✓ | ✓ |
| 12 | ScalePerRow | ✓ | ✓ | ✓ |
| 13 | ScalePerColumn | ✓ | ✓ | ✓ |
| 14 | WarpRectilinear2 | ✓ | ✓ | ✓ |
WarpRectilinear and WarpFisheye both support multi-plane warps (chromatic-aberration correction) and bicubic resampling. WarpRectilinear2 (DNG 1.6+) adds odd-power radial terms up to order 14 and an optional reciprocal-radial mode.
FixBadPixels* and the region opcodes are designed for raw CFA data; on a demosaiced RGB preview they are approximated.
Requires the .NET 9 SDK on Windows.
git clone <repo>
cd DngOpcodesEditor
dotnet run --project DngOpcodesEditor.csproj
Run the test suite with:
dotnet test
The dng-opcodes tool exposes the same opcode pipeline without a GUI. After
building:
dotnet run --project Cli/DngOpcodesEditor.Cli.csproj -- <command> [args]
Available commands:
| Command | Arguments | Purpose |
|---|---|---|
list |
<dng> |
List opcodes in each OpcodeList tag. |
extract |
<dng> <list:1|2|3> <output.bin> |
Save the OpcodeListN payload to a binary file. |
inject |
<dng> <input.bin> <list:1|2|3> |
Replace OpcodeListN in the DNG (modifies the file in place). |
metadata |
<file> |
Print common EXIF / DNG tags. |
preview |
<input.dng|tiff> <list.bin> <output.tiff> |
Apply an opcode list to an image and write a 16-bit RGB TIFF. |
[--decode-input-gamma] |
Apply the sRGB EOTF to the input first (use for gamma-encoded TIFF / PNG sources). | |
[--no-encode-gamma] |
Skip the final sRGB OETF (keep the TIFF linear). | |
[--raw-colors] |
Skip the DNG colour transform (keep camera-native RGB). | |
[--max-dimension N] |
Downsample so the longest side fits within N pixels. |
list, extract, inject and metadata work on any TIFF / DNG regardless of
compression (they only touch IFD entries). preview understands uncompressed,
Lossless JPEG, LZW and Adobe Deflate / zlib (compression codes 1, 7, 5 and 8 /
32946) image data.
| Project | Purpose |
|---|---|
Core/DngOpcodesEditor.Core.csproj |
Platform-agnostic library: opcode reader/writer, one C# file per opcode under Core/Opcodes/, TIFF/DNG IFD parser, Lossless JPEG / LZW / Deflate decoders, bilinear DNG raw demosaicer, colour pipeline (ColorTransform, DngColorInfo, DngToneCurve, ProfileHueSatMap), 16-bit RGB TIFF writer. |
DngOpcodesEditor.csproj |
WPF (Windows) GUI front-end. |
Cli/DngOpcodesEditor.Cli.csproj |
Headless dng-opcodes command-line tool. |
Tests/DngOpcodesEditor.Tests.csproj |
xUnit round-trip, decoder and CLI integration tests. |
Yes. The editor includes a built-in CFA reader with bilinear demosaic that handles uncompressed, Lossless JPEG (the most common compression) and tiled DNGs, as well as LinearRaw (already-demosaiced) DNGs.
If you ever hit a compression the reader does not handle, fall back to LibRaw's dcraw_emu to develop the file first:
dcraw_emu.exe -T -4 -o 0 input.DNG
The command produces a demosaiced linear TIFF image (16 bit) that can be opened as a Reference Image.
Opcodes are designed to work on linear, pre-gamma data. If your reference image is gamma-encoded (most 8-bit TIFFs and PNGs), tick Decode Input (sRGB); leave it unticked for linear input (DNGs are linear). Encode Output (sRGB) should normally stay ticked so the preview displays correctly on screen. The curve is the proper IEC 61966-2-1 sRGB transfer function, not a pow-2.2 approximation.
Make sure your image viewer supports 16-bit TIFF files.
- This is not an official DNG tool and may not be fully compliant with the DNG specification.
FixVignetteRadialmay require adjusting the strength in some RAW processors (for example Capture One).- Open an issue if you need an opcode that is not yet implemented.