Sigma DP2 Merrill photo filter
A Sigma DP2 Merrill photo filter with precise detail and a layered-sensor processing reference.
This effect approximates a documented capture and processing recipe on an existing image. It is not a measured or exact reproduction.
Behind the camera look
The original camera
The DP2 Merrill combines a Foveon X3 sensor with a fixed 30mm f/2.8 lens. Its layered capture is central to its identity, but the advertised count of roughly 46 million sensor sites is not the number of spatial pixels in a finished JPEG. Sigma specifies a maximum JPEG size of 4704 × 3136 pixels, about 14.75 million image pixels. [1]
Processing history also matters. Sigma’s firmware 1.05 notes describe changes to white-balance color tones across the DP Merrill series. Our research names that version as a future matched-capture target; it does not establish that the older review samples were produced with that firmware. A camera name alone is insufficient to identify the exact color-processing path. [2]
Our interpretation
Standard is the default interpretation, combining moderate color and contrast with restrained edge enhancement. Neutral lowers the emphasis on color and contrast, making it a gentler starting point for an image that already has a strong grade. B&W converts the treatment to monochrome. Each response is an authored estimate rather than an extracted Sigma profile or a Sigma Photo Pro RAW-development preset.
Detail controls the added edge emphasis. It is intended to separate existing fine structures without making every edge harsh. Compare small lettering, branches, or woven surfaces at native size, and reduce it if the source already contains sharpening halos. Unlike our Canon treatment, this effect does not introduce a resolution-dependent sampling ceiling. That distinction helps preserve the separate directions of the two digital interpretations.
Luma Noise and Chroma Noise separate brightness texture from colored shadow texture. ISO changes their modeled strength; it does not adjust exposure. Colored noise is weighted toward darker areas and is inactive in B&W, while luminance texture can remain. This separation gives you control over the finish without pretending that added noise recreates layered spectral capture. Keep both restrained for bright, detailed images.
Evidence and limits
Our source set includes the bookshelf and office JPEGs from Mark Goldstein’s DP2 Merrill review. Their original dimensions supported inspection of fine structures, but their complete white-balance settings, color modes, firmware, and resaving histories remain unknown. The review is useful as a firsthand image source; manufacturer specifications take precedence when its resolution descriptions conflict with the recorded output dimensions. [3]
The skate photograph above demonstrates our filter on the shared source photograph. It was not taken with a DP2 Merrill. We have not fitted our contrast, sharpening, or texture values against matched camera captures, and we cannot infer how an original scene would stimulate the sensor’s three layers from an already processed RGB image. Lens perspective, depth of field, missing detail, and RAW color information remain outside this treatment. Use Mix to compare the result with the source rather than treating stronger settings as greater camera accuracy.
Sources
- Sigma DP2 Merrill specificationsSigma · manufacturer specifications
- Sigma DP2 Merrill firmware historySigma · firmware 1.05 release notes
- Photography Blog: Sigma DP2 Merrill reviewMark Goldstein / Photography Blog · camera review and JPEG samples
Creative applications
- Detailed still lifes and architectural photographs.
- Exploring restrained detail and low-light texture separately.
Starting workflow
- Start with a well-exposed image. Standard is the default; switching recipes keeps your other edits.
- Balance Detail with Separation: Separation strengthens small tonal differences while protecting flat areas and strong contours. Luma Noise and Chroma Noise shape shadow texture separately.
- Adjust Exposure before tuning the optical, response or texture controls.
- Compare with the source using Mix and inspect fine edges at the intended output size.
Key controls
- Detail
Balance Detail with Separation: Separation strengthens small tonal differences while protecting flat areas and strong contours. Luma Noise and Chroma Noise shape shadow texture separately.
Default: 65% · Range: 0% to 100%
- Processing
Camera-JPEG color mode interpretation. Switching recipes preserves other control values.
Default: Standard · Choices: Standard, Neutral, B&W
- ISO
Index into virtual sensitivity texture profiles.
Default: 100 · Choices: 100, 400, 1600, 6400
- Luma Noise
Multiplier on luminance texture; 0 off.
Default: 1 · Range: 0 to 2
- Chroma Noise
Multiplier on spatially correlated shadow color texture; 0 off.
Default: 1 · Range: 0 to 2
- Exposure (EV)
Trim input brightness before processing; clipped detail cannot be recovered.
Default: 0 · Range: -2 to 2
- Mix
Blend with the source; zero bypasses the treatment.
Default: 100% · Range: 0% to 100%
- Seed
Choose a repeatable texture arrangement. Variation rate controls whether it changes during playback.
Default: 17 · Range: 0 to 65535
- Variation rate
Zero holds the seeded texture. Raise Variation rate and enable animation for deterministic texture changes during playback; returning to the same time reproduces the pattern.
Default: 0Hz · Range: 0Hz to 30Hz
- Separation
Emphasize fine tonal differences with protection for flat areas and strong edges; pair with Detail. Zero restores the previous detail treatment.
Default: 45% · Range: 0% to 100%
Practical tips
- Judge texture at the final display or export size.
- Use the same source and exposure when comparing camera treatments.
Limitations
- Cannot recreate Foveon spectral capture or add spatial detail absent from the source; high-ISO texture is initially uncalibrated.
- Existing grades, compression and clipping remain part of the input. Recipe fidelity has not yet been validated against matched captures.
- Brand and model names identify the inspiration; no manufacturer endorsement is implied.
