Explore the measurements
Choose a question, inspect the measured spectra, and compare the colors or forecasts. Read the investigation.
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Reading the color coordinates and differences
XYZ describes measured or predicted color under the named light and observer conventions. Lab expresses color as lightness (L*), green–red (a*) and blue–yellow (b*) coordinates. D50 names the standard daylight reference used for the i1Pro color calculations here; each experiment's measurement details state its convention.
DeltaE00 is an unsigned color distance. Check which two colors are compared: two measured patterns, forecast versus measurement, or requested versus measured color. RMS (root mean square) instead summarizes the magnitude of a wavelength-by-wavelength spectral difference, in the displayed units. Neither automatically defines visibility.
A signed difference keeps the direction in the order named beside it. For Lab, positive L* means lighter, positive a* redder and positive b* yellower. Repeated-reading movement describes how readings changed, not an uncertainty bound. i1Pro reflectance factor and CR-250 radiance remain separate quantities.
Measured group means
| Pattern | XYZ | Lab |
|---|
Measured spectra
Individual readings
Select a reading to highlight its spectrum. Scroll the table sideways on a small screen.
| Reading | Pattern | Measured XYZ | Measured Lab | Temperature |
|---|
Predictions and desired colors
| Reading | Comparison | Predicted or desired XYZ | DeltaE00 | Chosen limit | Signed XYZ difference | Result |
|---|
Measurement details and source
| Reading | Saved reading identifier | Pixel-pattern identifier |
|---|
Values are copied from the saved measurement analyses. A missing value is left blank rather than calculated by this page. Repeated-reading movement describes the observations; it is not an uncertainty estimate.
Choose a comparison
75 comparisons · 15 color pairs · 3 stripe widths
Why use ABBA and BAAB? In this atlas, A is the horizontal pattern and B is the vertical pattern. ABBA is H–V–V–H; BAAB reverses the order to V–H–H–V. Each exact pattern is measured twice. Reversing which pattern comes first and last shows whether the measured H-minus-V direction persists when the reading order changes, while the duplicate readings show how much each unchanged pattern moved within the sequence. This does not remove display history or identify a cause.
Absolute color and H minus V
Nominal-D50 XYZ/Lab for this exact comparison
Horizontal mean color (Lab)——
Vertical mean color (Lab)——
Spectrum difference—percentage points RMS
Color distance—DeltaE00; unsigned
Color-coordinate change (Lab)—horizontal minus vertical
Tristimulus change (XYZ)—horizontal minus vertical
All four spectra and their means
Solid lines are horizontal; dashed lines are vertical. Thin lines are the individual readings; thick lines are the H and V means. The approximate screen colors come from the measured nominal-D50 XYZ values and may look subdued for darker panel colors.
Horizontal, solidVertical, dashed
Signed H minus V spectrum
This keeps the wavelength-by-wavelength direction that RMS and DeltaE00 remove.
How much did the repeated readings move?
Horizontal and vertical each appeared twice in this four-reading sequence. This describes the duplicate readings; it is not an uncertainty estimate.