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Article 21

TV Color Decoding: How to Set Color, Tint, and CMS Controls

Color decoding includes signal interpretation, matrix conversion, gamut mapping, global Color and Tint controls, and CMS correction. Begin from a reset reference-oriented mode and reserve fine CMS changes for measured calibration.

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Direct answer

In brief

Color decoding is broader than the Color and Tint sliders. Begin from a reset reference-oriented mode, verify the signal colorimetry and range, disable optional color boosting, and select the source-matched or measured Color Space mode. Use a valid blue-only color-bar pattern only as a coarse Color and Tint check, and leave CMS controls at reset without measurement. Full calibration requires primary and secondary chromaticity, color luminance, saturation sweeps, broad color-checker patches, grayscale, EOTF, ramps, and separate SDR and HDR verification.

By this point, the SDR picture has a defined:

The next step is color.

That does not mean making the picture more colorful.

It means verifying how the television converts encoded color information into emitted red, green, and blue light.

The safest starting procedure is:

  1. Reset the intended picture mode.
  2. Confirm the source’s colorimetry and signal state.
  3. Disable optional color enhancement.
  4. Select the intended source-matched color-space mode.
  5. Leave Color and Tint at reset until a valid test says otherwise.
  6. Leave CMS controls at reset without measurement.
  7. Use a valid blue-only color-bar pattern only as a coarse check.
  8. Measure the complete color response before calling the result calibrated. [7]

Color decoding is a chain

A modern television can perform:

A visible color error can originate at any stage.

The Color slider is only one part.

An eight-stage television color-decoding chain runs from signal colorimetry and range through Y prime Cb Cr matrix interpretation, chroma upsampling, RGB reconstruction, gamut mapping, color-management adjustment, panel-primary conversion, and emitted panel light. Optional global Color, Tint, and color enhancement controls are shown as separate branches rather than the whole decoding process.
Color decoding includes signal interpretation, conversion, gamut adaptation, optional adjustment, and panel conversion. Color and Tint are only part of that process.

BT.709 target colorimetry

Recommendation ITU-R BT.709-6 defines the HDTV color primaries:

BT.709 primary chromaticity coordinates
Primary x y
Red 0.640 0.330
Green 0.300 0.600
Blue 0.150 0.060

It defines D65 reference white:

Those coordinates describe target chromaticity.

They do not describe the luminance of each measured color.

Luma coefficients

BT.709 derives nonlinear luma as:

Y′ = 0.2126 R′ + 0.7152 G′ + 0.0722 B′ [1]

The coefficients are not equal because the system’s luma relationship reflects the contribution of each primary.

Color-difference components

BT.709 also defines color-difference signals related to:

Those components can be represented as Cb and Cr in digital systems.

A television reconstructs R′G′B′ from the received representation.

A wrong matrix can change:

That cannot be corrected completely by one global Color control.

A CIE 1931 xy coordinate plot marks the BT.709 red primary at 0.640, 0.330, green at 0.300, 0.600, blue at 0.150, 0.060, and D65 at 0.3127, 0.3290. The BT.709 triangle is solid teal. A dashed amber triangle is labeled as an illustrative panel capability rather than a measurement.
BT.709 specifies the red, green, and blue primary coordinates and D65 reference white. A television sample must be measured to compare its actual gamut.

Digital delivery and color error

What digital transport prevents

Digital transport does not gradually lose chroma amplitude or rotate composite phase in the same way as a weak analog path.

The decoder receives discrete values.

What can still fail

Color can still be altered by:

The diagnostic task is to identify the stage.

The Color control

Typical function

The global Color control often changes chroma gain or overall color intensity.

Raising it can make many colors more saturated.

Lowering it can move them toward neutral.

The exact change can be nonlinear.

The scale is arbitrary

A reset value of 50 or another midpoint is common.

It does not prove:

The value belongs only to that mode and television.

When to move it

Move Color only when:

Document the reset value and final value.

The Tint or Hue control

Typical function

Tint can change a chroma phase or hue relationship.

On a color-bar pattern, it can change the cyan-magenta comparison.

Direction varies

Do not assume:

Test the exact control.

Availability varies

Tint can be:

A grayed-out control is not necessarily a fault.

Two conceptual control diagrams compare global Color and Tint. The Color panel shows color vectors increasing or decreasing in distance from neutral, representing broad chroma-amplitude change. The Tint panel shows the vectors rotating around neutral, representing a broad hue or phase change. A note states that actual control behavior and direction are model-specific.
Color commonly changes broad chroma amplitude, while Tint commonly changes a hue or phase relationship. Neither control scale or direction is universal.

Reset values

A reset is a known baseline.

It is not a measurement.

After a mode reset, the television may still apply:

A displayed CMS value of zero usually means no user offset from the mode’s base table.

It does not mean no internal processing.

SMPTE color bars

SMPTE RP 219-1:2014 defines a multi-format color-bar signal for HDTV and SDTV-compatible use. [2]

The signal contains more than seven bars.

It includes:

Use the exact sub-pattern described by the test documentation.

Scope warning

RP 219 says that precision setup of fixed-pixel matrix displays is beyond its scope. [2]

It still documents useful monitor-adjustment relationships.

A consumer television requires additional measured verification.

A simplified structural map of SMPTE RP 219-1 color bars shows four stacked regions: 75 percent bars with side gray, a color-difference and chroma reference band, a luminance ramp with 100 percent color references, and a black-white-PLUGE region. A note says the structure is simplified, not to scale, and does not reproduce the standard pattern.
RP 219-1 combines multiple bar, reference, ramp, white, black, and PLUGE regions, so it should not be reduced to a single seven-bar row.

The blue-only color-bar test

Preferred viewing methods

Use, in order:

  1. a documented blue-only mode in the display
  2. the filter supplied or specified by the pattern vendor
  3. another filter only after confirming that rejected bars become black

A filter does not produce a mathematically exact source channel automatically.

Correct pattern appearance

With the Spears & Munsil Color and Tint pattern and correct blue-only viewing:

If red, green, or yellow remains visible, the filter is not sufficiently selective or the setup is wrong.

Color adjustment

Compare:

Adjust the global Color control until they match as closely as possible. [3][4]

Tint adjustment

Compare:

Adjust Tint until they match as closely as possible. [3][4]

Iterate

Color and Tint can interact.

After moving Tint, recheck Color.

After moving Color, recheck Tint.

Use small changes.

Record each step.

Stop conditions

Stop and reset when:

Measurement is then required.

A conceptual blue-only color-bar result shows blue, white, cyan, and magenta at the same visible blue level. Red, green, and yellow are black. Comparison brackets identify blue versus white for Color and cyan versus magenta for Tint. A note states that the pattern and viewing method must be compatible.
In a compatible blue-only view, blue, white, cyan, and magenta match while red, green, and yellow become black.

Filter validity

Display spectra differ

An LCD, OLED, QD-OLED, quantum-dot LCD, and projector can emit different spectra.

A filter that works for one can leak on another.

Strength test

Spears & Munsil provides several filter strengths because different displays need different rejection. [5][6]

Start with the lightest strength.

Increase strength until:

Do not add unnecessary layers after the rejected bars disappear.

Room condition

Dim the room.

Block stray light around the filter.

Use one eye to reduce conflicting room cues.

Keep the comparison brief enough to avoid fatigue.

Blue-only mode

A documented blue-only mode avoids some filter-spectrum limitations.

Confirm that the mode is truly intended for setup.

A general blue picture preset is not the same function.

Three conceptual blue-filter panels compare an insufficient filter, a stronger filter, and a valid rejection result. In the weak-filter panel red and yellow remain visible. In the stronger-filter panel they are reduced but still detectable. In the valid panel red, green, and yellow are indistinguishable from black while the comparison bars remain visible.
A valid filter-view result requires red, green, and yellow to become indistinguishable from black. Stronger filtration may be needed for a different display spectrum.

What the test verifies

A valid test can provide a coarse check of:

RP 219 describes blue-only monitor adjustment of chroma gain and phase in composite systems and Cb/Pb gain in component systems. [2]

What it does not verify

The test does not prove:

Treat it as one setup tool.

A two-column diagram separates what a valid blue-only test can check from what requires meter measurement. The blue-only side includes broad chroma gain, the Color comparison, the Tint relationship, and gross pattern interaction. The measurement side includes gamut endpoints, color luminance, saturation sweeps, secondary accuracy, HDR color volume, uniformity, and CMS linearity.
The valid blue-only method is a coarse Color and Tint check. Full gamut, luminance, saturation, HDR, and spatial performance need measurement.

Valid pattern delivery

Use SDR for the SDR test

Confirm:

Do not trigger HDR while using an SDR color-bar workflow.

Playback risks

A pattern can be altered by:

The pattern file and the output signal both matter.

Disc and local files

A purpose-built disc or documented local pattern provides more control than a general streaming video.

The player can still change:

Verify it.

Color Space modes

Auto

Auto can select color space from:

It can be correct.

It can also make a wrong decision.

Measure it.

Native

Native often exposes more of the panel’s native gamut.

For a BT.709 source, that can oversaturate colors if no proper mapping remains.

Native can also be the starting state for a manual CMS workflow.

Do not judge from the word.

Custom or Manual

A Custom mode can provide:

The displayed numbers may not correspond directly to CIE coordinates.

Map the controls.

Source-matched goal

For SDR BT.709 content, the displayed colors should follow the BT.709 target within the display and calibration limits.

The panel can have a larger native gamut.

It should not stretch the source automatically when reference reproduction is the goal.

Three conceptual Color Space cards compare Auto, Native, and Custom. Auto shows source signaling feeding manufacturer selection logic. Native shows the panel capability outline without assuming source-matched conversion. Custom shows a measured user mapping inside panel capability. A bottom rule says menu names do not determine accuracy.
Color Space menu names describe intended choices, not guaranteed behavior. The correct source-matched base is established by documentation and measurement.

Gamut mapping and color boosting

Gamut mapping

Gamut mapping adapts source colors to target capability.

It can be required when:

Color boosting

A color booster deliberately changes saturation, hue, luminance, or object colors for preference or visibility.

It is optional enhancement.

The terms can overlap in a menu.

The functions are conceptually different.

Conversion tradeoffs

Report ITU-R BT.2407-0 examines conversion from BT.2020 to BT.709 and describes hue and saturation tradeoffs in gamut conversion. [9]

No single menu label guarantees the chosen conversion.

A two-column diagram separates optional color boosting from gamut mapping. The color-booster side expands saturation for preference or visibility and is labeled optional enhancement. The gamut-mapping side converts source colors into the display capability and is labeled required adaptation when source and display gamuts differ. Neither side is presented as one universal algorithm.
Optional color enhancement deliberately changes appearance, while gamut mapping adapts source colors to display capability when the two differ.

Color Management System

Possible controls

A CMS can offer controls for:

For each color it can offer:

Control meaning must be mapped

A control labeled Saturation can also move hue.

A control labeled Hue can alter luminance.

A control labeled Luminance can change clipping.

Measure the response.

Native-gamut limit

A CMS cannot create a color outside the panel’s physical capability.

If the panel’s red primary falls inside the target:

The system can trade:

It cannot create missing hardware gamut.

Primary and secondary interaction

Changing red can alter:

Changing cyan can alter nearby blue and green mixtures.

Remeasure the complete set.

A conceptual CMS interaction map starts with a Red Hue adjustment and connects it to movement of red, yellow, and magenta, plus possible changes in color luminance and grayscale. A second panel compares a smooth small correction with an excessive correction that introduces cross-effects and a ramp discontinuity. The diagram states that control behavior must be measured.
A consumer CMS adjustment can affect adjacent colors, luminance, grayscale, and smoothness, so every correction requires broad verification.

What to measure

Primary and secondary points

Measure:

Record chromaticity and luminance.

Saturation sweeps

Measure several saturation levels, such as:

The exact percentages should follow the chosen workflow.

A display can be accurate at 100 percent and wrong through the interior.

A conceptual saturation-tracking graph plots red saturation from neutral to the 100 percent endpoint. The endpoint lands on the target at 100 percent, while measured example points at 25, 50, and 75 percent deviate from the target path. A warning states that one accurate primary endpoint does not prove the interior colors are accurate.
Measure intermediate saturation points because a display can hit the primary endpoint while the interior color response remains wrong.

Color-checker patches

Use a broad patch set that includes:

These are controlled reference stimuli.

They are not visual guesses from a film frame.

Luminance

Color accuracy includes luminance.

A chromaticity point can be close while the color is too bright or too dim.

Two color samples have the same displayed chromaticity coordinates but different luminance. The left sample is labeled target luminance and the right sample is labeled too bright. A side card shows x and y unchanged while Y luminance differs. The diagram explains that chromaticity alone does not complete a color measurement.
Color accuracy requires both chromaticity and luminance. Matching a coordinate does not prove the color is emitted at the intended level.

Grayscale

Remeasure D65 and grayscale after CMS changes.

The white reference is part of the color system.

EOTF

Remeasure luminance tracking.

CMS adjustments can alter the transfer response.

Ramps

Check for:

A low numerical error is not useful if smooth gradients are damaged.

CMS workflow

Step 1: Preserve reset values

Record every CMS control.

Export the calibration table where supported.

Step 2: Measure the unadjusted mode

Determine whether the error is:

Step 3: Fix upstream errors first

Confirm:

Do not use CMS to compensate for a wrong source matrix.

Step 4: Use the least invasive control

Start with:

Step 5: Use small changes

Measure:

Step 6: Verify the full set

Do not stop when one endpoint becomes exact.

Step 7: Inspect ramps and real scenes

Look for artifacts and implausible transitions.

Step 8: Save and report

Include all signal and measurement conditions.

A no-meter workflow

A reader without instruments can create a safe baseline.

1. Reset the mode

Use the intended reference-oriented mode.

2. Confirm earlier settings

Verify:

3. Select the documented source-matched color-space mode

Use model-specific evidence.

Do not assume Auto or Native from the name alone.

4. Leave CMS at reset

Do not adjust six-axis controls by eye.

5. Use a valid blue-only test when available

Follow the exact pattern instructions.

Use small Color and Tint changes only when the comparisons are valid.

6. Check a broad range of content

Look for:

Do not use one face or landscape as a standard.

7. Stop

Describe the result as:

Do not call it complete Rec. 709 calibration.

A nine-stage color-calibration workflow runs from stable grayscale and EOTF through signal-path verification, gamut measurement, base Color Space selection, global Color and Tint adjustment when justified, cautious CMS correction, saturation sweeps, color-checker measurement, and final verification of grayscale, EOTF, clipping, ramps, and real content.
Color work begins after the signal path, grayscale, endpoints, and EOTF are stable, then proceeds from broad measurement to cautious correction and full verification.

A measured SDR workflow

1. Document the system

Record:

2. Verify grayscale and EOTF

Color calibration follows a stable neutral luminance structure.

3. Measure the reset color response

Include:

4. Compare Color Space modes

Measure Auto, Native, and Custom where relevant.

Choose the best base.

5. Adjust global controls only for broad error

Use the Color and Tint pattern or measurement.

6. Apply CMS correction carefully

Map each control.

Use small changes.

7. Remeasure the complete set

Check for collateral error.

8. Verify real content

Use several titles and known technical material.

HDR color

Three columns compare SDR, PQ HDR, and HLG HDR color systems. SDR uses BT.709 system colorimetry with BT.1886 luminance tracking. PQ HDR and HLG HDR use BT.2020 system primaries and D65 under BT.2100, with PQ or HLG transfer behavior and color-volume mapping. A note states that an SDR blue-filter or CMS result does not prove HDR color accuracy.
SDR BT.709 and HDR BT.2100 use different transfer-system and color-volume workflows, so color calibration must be verified separately.

BT.2100 colorimetry

BT.2100-3 specifies:

These are BT.2020 system primaries.

A consumer panel may not reach all of them.

Container and mastering gamut

An HDR signal can be represented in a BT.2020 system while the mastered colors occupy:

The representation does not prove every color reaches BT.2020 boundaries.

Color volume

HDR color performance depends on:

A two-dimensional gamut chart is not enough.

HDR CMS

A television can offer:

Test the storage and behavior.

HDR10, HDR10+, and HLG

Verify separately when the television behaves differently.

For this project’s Samsung television:

Blue-filter limitation

Do not use an SDR blue-filter result as proof of HDR color.

Use valid PQ or HLG measurement patterns.

Uniformity and viewing angle

Uniformity

Check several screen positions for:

A center CMS correction cannot fix spatial variation.

Viewing angle

Measure and judge from the intended seat.

Off-axis color can differ by: [10]

Document the primary position.

Reset and storage

Before reset

Record:

Read the warning

A reset can apply to:

Do not assume.

After reset

Reconfirm:

A reset removes earlier work.

A television settings-memory map begins with a picture-mode reset and branches through picture mode, external input, internal application, SDR, HDR10, HDR10 plus, HLG, and Game Mode. Some branches are shown as potentially shared and others as potentially separate. A warning says reset and storage behavior must be tested and documented on the exact model and firmware.
A television can share or separate color settings by mode, input, application, format, and Game Mode. Reset scope must be tested rather than assumed.

Troubleshooting

The picture is globally oversaturated

Check:

  1. color booster
  2. Color Space Native or Expanded
  3. global Color
  4. wrong colorimetry
  5. HDR-to-SDR conversion
  6. source device
  7. app processing
  8. CMS

The picture is globally desaturated

Check:

Faces are orange

Possible causes include:

Use controlled patches.

Faces are green or magenta

Check:

Do not move Tint before confirming grayscale.

Blue-only rejected bars remain visible

Check:

The test is invalid until rejected bars are black.

Blue and white match but cyan and magenta do not

Tint may require adjustment.

Color and Tint can interact.

Recheck both.

No Color and Tint setting makes every comparison match

Possible causes include:

Reset and measure.

Primaries are accurate but intermediate colors are wrong

Check:

Do not chase endpoints.

Saturation improves but luminance becomes wrong

The CMS controls interact.

Use a broader optimization.

SDR is accurate but HDR is oversaturated

Check:

Do not copy SDR values blindly.

Colors change between scenes

Check:

Confirm with controlled repeated patterns.

Measurements vary

Check:

Calibrate only stable data.

What correct setup looks like

By measurement

A verified SDR color mode should show:

By eye

A practical unmeasured mode should show:

Visual plausibility is not numerical calibration.

What calibration can fix

Calibration can reduce:

within the controls and panel capability.

What calibration cannot fix

Calibration cannot:

A color-calibration report should include:

Where this leaves us

The useful rule is not:

Leave Color and Tint at 50 and zero because digital video is perfect.

The useful rule is:

Begin from the reset reference-oriented mode, verify the signal and color-space path, use valid patterns for coarse controls, and reserve CMS adjustment for measured calibration.

The blue-only color-bar test remains useful when performed correctly.

Its correct interpretation is:

That test does not certify complete color reproduction.

Full calibration requires:

The next article covers HDR setup.

That stage combines:

Final verification follows after all modes have been measured and documented.

Sources and standards

Primary ITU SDR and HDR transfer-function recommendations and Spears & Munsil calibration-pattern guidance used in this article. Last verified July 31, 2026.

  1. International Telecommunication Union Radiocommunication Sector. Parameter Values for the HDTV Standards for Production and International Programme Exchange. Recommendation ITU-R BT.709-6, June 2015.
    https://www.itu.int/dms_pubrec/itu-r/rec/bt/r-rec-bt.709-6-201506-i%21%21pdf-e.pdf

    ↩↩

  2. Society of Motion Picture and Television Engineers. High-Definition, Standard-Definition Compatible Color Bar Signal. SMPTE RP 219-1:2014.
    https://pub.smpte.org/latest/rp219-1/rp0219-1-2014.pdf

    ↩↩↩

  3. Spears & Munsil. Pattern Help Text, 2nd Edition. Official calibration documentation, reviewed July 31, 2026.
    https://spearsandmunsil.com/portfolio-item/pattern-help-text/

    ↩↩↩

  4. Spears & Munsil. Setting Color and Tint, Ultra HD Edition. Official calibration documentation, reviewed July 31, 2026.
    https://spearsandmunsil.com/portfolio-item/setting-color-and-tint-3/

    ↩↩↩

  5. Spears & Munsil. Using the Spears & Munsil Calibration Filter, Ultra HD Edition. Official calibration documentation, reviewed July 31, 2026.
    https://spearsandmunsil.com/portfolio-item/using-the-spears-munsil-calibration-filter-3/

    ↩

  6. Spears & Munsil. Getting Started with the Ultra HD Benchmark, 3rd Edition. Official calibration documentation, reviewed July 31, 2026.
    https://spearsandmunsil.com/portfolio-item/getting-started-with-the-ultrahd-benchmark-3rd-edition/

    ↩

  7. International Telecommunication Union Radiocommunication Sector. A Reference Viewing Environment for Evaluation of HDTV Program Material or Completed Programmes. Recommendation ITU-R BT.2035-0, July 2013.
    https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.2035-0-201307-I%21%21PDF-E.pdf

    ↩

  8. International Telecommunication Union Radiocommunication Sector. Image Parameter Values for High Dynamic Range Television for Use in Production and International Programme Exchange. Recommendation ITU-R BT.2100-3, February 2025.
    https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.2100-3-202502-I%21%21PDF-E.pdf

    ↩

  9. International Telecommunication Union Radiocommunication Sector. Colour Gamut Conversion from Recommendation ITU-R BT.2020 to Recommendation ITU-R BT.709. Report ITU-R BT.2407-0, 2017.
    https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2407-2017-PDF-E.pdf

    ↩

  10. International Telecommunication Union Radiocommunication Sector. Television Colorimetry Elements. Report ITU-R BT.2380-2, 2018.
    https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2380-2-2018-PDF-E.pdf

    ↩
Related reading: What the CIE Color Diagram Tells You About Your TV Review the color-space geometry and gamut concepts behind Color Space and CMS measurements. Next step: HDR Setup Continue from SDR color decoding into HDR10, HDR10+, HLG, HDR Reference White, peak behavior, tone mapping, color volume, and gaming-specific setup.