Help
How to use it
- Choose a LUT. The report updates automatically.
- The LumaticLAB test card appears by default. Add a photograph for a real before / after comparison; Clear photo restores the test card.
- Choose black, 50% grey or white as the viewing background.
- Use the PNG export for a presentation-ready infographic.
- Use print to save an A4 portrait PDF containing the infographic and written notes.
- Use Save AI Prompt to open the measured breakdown, then copy or download the prompt.
- Use Save LUT info to add the LUT name, type, tone, cast, chroma and your 30-character entry to one master CSV catalogue.
- Click, tap or right-click the tonal, colour or before / after area of the infographic to open its enlarged viewer.
- In the print dialogue, turn off Headers and footers if it is offered. The report supplies its own copyright footer, and this removes the local file address.
Save AI Prompt: detailed guide
Save AI Prompt converts the measured LUT analysis into a practical specification for image or video editing tools. It opens after a LUT has been analysed and does not alter the report or source files.
Tonal characteristics
The tonal section records the measured black floor, shadow placement, middle-grey position, central contrast and highlight endpoint. Use these findings to shape a master curve or equivalent global tonal controls.
Colour characteristics
The colour section records neutral balance, average saturation retention, chroma displacement, the strongest hue movement and the treatment of important colour families. Use these findings with temperature, tint, saturation and selective-colour controls.
Structured generation prompt
The prompt restates the measurements as editing instructions under tone curve, colour balance, selective colour, skin tones, aesthetic direction and constraints. It is suitable as a starting brief for compatible image, video or generative tools.
Copy and Download TXT
Copy places the complete guide on the clipboard. Download TXT saves the same guide beside your other files.
Save LUT info and CSV catalogue
The separate Save LUT info button opens the CSV controls directly. Choose a standard Type or enter a custom one, then add the LUT to one master catalogue.
Interim filtered output
Open the master catalogue, choose a Type under Interim output and export the matching rows. The temporary CSV does not alter the master file.
Enlarged viewer
Click, tap or right-click the tonal, colour or before / after area to open a larger view. The comparison viewer uses a curtain slider to reveal the processed image over the original.
Important: the guide describes a global LUT response. Match it in the source image's colour space, test several representative images and refine exposure before judging the result.
Tonal check: detailed guide
A neutral RGB ramp is passed through the LUT at 101 evenly spaced levels. Its output is converted to relative luma, so the graph describes brightness shaping without confusing it with colour saturation.
Black point and shadows
The output at 0%, 5% and 10% input shows whether the LUT lifts the black floor, preserves shadow separation or crushes dark detail. Lifted blacks can feel matte; crushed blacks can feel dense but may hide texture.
Mid-tones and contrast
The 25%, 50% and 75% readings show where ordinary subject detail is placed. The span from 25% to 75%, plus the local slope around 50%, is used to describe soft, balanced or high contrast and whether mid-tones are brightened, darkened or flattened.
Highlights and white point
The 90%, 95% and 100% readings reveal highlight compression, roll-off and peak-white placement. A flattened upper curve suggests gentler highlight separation; a steep or clipped end can make bright detail harder and less forgiving.
Read with: the curve position, its steepness and the numeric black, mid and white values. This is a relative LUT response, not a measurement of scene dynamic range.
Chroma check: detailed guide
Nine fixed reference colours are passed through the LUT. Their input and output positions are compared in the CIE 1931 xy diagram and in HSL colour space.
Neutral cast
A 50% neutral grey is checked for unequal red, green and blue output. This identifies a practical warm, cool, green or magenta bias that may be visible in greys and near-neutral areas.
Hue movement
Each arrow begins at a reference colour and ends at the LUT output. Arrow direction describes the hue destination; arrow length describes chromaticity displacement. The report names the largest movement and its approximate hue change.
Saturation change
Output saturation is divided by input saturation for each coloured sample. The average is used to describe desaturation, natural saturation or increased saturation, while individual results reveal selective treatment of colours such as blue and green.
Read with: both arrow movement and the palette swatches. A large arrow means colour movement, not automatically greater saturation.
Skin-tone check: detailed guide
The skin strip uses eight synthetic reference tones ranging from deeper to lighter complexions. Every swatch is transformed by the LUT at full strength.
Hue direction
The central skin reference is checked for hue rotation. The report identifies whether skin remains natural or leans towards a named colour family such as amber, red, magenta or green.
Saturation retention
The input and output saturation of the central skin reference are compared as a percentage. A low result indicates softened or muted skin; a high result warns that warmth, redness or make-up colours may become more pronounced.
Brightness change
Input and output luma are compared to show whether skin is likely to render lighter or darker before exposure or blending adjustments.
Important: these are synthetic colour samples, not people. Always confirm the result on varied real skin tones, lighting conditions and camera profiles.
Palette check: detailed guide
The upper swatches show eight transformed reference colours: red, orange, skin, yellow, green, cyan, blue and magenta. The lower strip shows ten transformed neutrals from black to white.
Colour balance
The coloured row makes selective changes easy to compare. The report identifies the colour with the largest saturation increase and the colour with the largest reduction, which helps distinguish a broad saturation change from a selective palette design.
Neutral integrity
The grey ramp shows whether neutral values remain grey or acquire a tint, and whether tonal steps remain distinct. A tint across the strip suggests deliberate colour toning; merged steps suggest tonal compression.
Practical interpretation
Use the palette check to anticipate which subject colours will dominate, recede or change family. It is a compact diagnostic set rather than a complete measurement of every possible RGB value.
Limitations
The written analysis is a practical creative interpretation, not a colour science certification. Camera transforms, exposure, display profiles and the source image will affect the perceived result.
