Example 01 / MTF Sharpen
BEFORE
AFTER
LinearLens / DaVinci Resolve DCTLs
Treat sharpening as spatial response, not an outline generator.
MTF Sharpen is designed around the idea that a lens-and-sensor system attenuates different spatial frequencies by different amounts.
Demonstration
Three real render comparisons.
Each wipe uses one neutral frame from the demo set and the matching LinearLens output for this tool.
Example 02 / MTF Sharpen
BEFORE
AFTER
Example 03 / MTF Sharpen
BEFORE
AFTER
The science
Why this behaves differently from the obvious alternative.
The modulation transfer function describes how contrast is transmitted through an imaging system as detail becomes finer. Real optics do not simply switch between sharp and blurred; their response rolls off across spatial frequency.
A sharpening stage can therefore be thought of as reshaping that response. Working in linear light also avoids letting a gamma curve determine the relative weight of neighbouring light values before the spatial correction is made.
Against generic unsharp mask
An unsharp mask is excellent at creating local edge contrast, but its visual signature can quickly become a halo. MTF Sharpen is intended for restrained resolution shaping and matching earlier in the pipeline.
Useful after optical softening
Putting resolution shaping in the same linear optical block as diffusion or defocus makes it easier to balance perceived acuity against deliberate light spread.
MTF Sharpen
Percieved resolution shaping.
Useful after diffusion, when matching lenses or cameras, or whenever you want the sharpening stage to behave as part of the optical model rather than as a finishing effect after the image is already rendered.
Design principle
MTF-oriented response
Built around shaping spatial response instead of simply making edge transitions steeper.
Design principle
Linear-light operation
Neighbouring values are processed before a nonlinear development curve changes their relationship.
Design principle
RGB-aware control
The stage can remain sensitive to channel behaviour instead of treating every component as one luminance edge map.
Design principle
Restrained working range
Designed to be useful for lens matching and perceived-resolution control as well as stronger creative settings.
How to use
Make a linear optical block, then continue into the grade.
The DCTL does not need to own your colour management. Put the transforms around it: camera source into a suitable linear RGB representation, LinearLens in the middle, then into the colour-development space you want to grade in.
01
Camera source
Log / RAW development input
02
Transform to linear
Keep a suitable working gamut; make light scene-linear
03
MTF Sharpen
Diffusion / bloom / CA / MTF / defocus
04
Transform to development space
For example DWG Intermediate or another grading space
05
Camera + colour + film work
Balance, creative grade, film emulation, output rendering
The important placement is the highlighted block: LinearLens belongs after you have made the image linear, and before the development, grading and film-look stages that intentionally reshape tonal values.
Use a Colour Space Transform, ACES transform or equivalent to get the image into a scene-linear RGB representation while retaining an appropriate gamut.
Place diffusion, bloom, CA, MTF sharpening or defocus here. If you use several, this is the optical-character section of the chain.
Transform onwards into the space used for camera matching, primary colour, creative looks and film emulation. Those stages can then work on an image whose optical character is already established.
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