Glossary

This glossary provides definitions for key terms the Graphics Test Framework package uses.

• DeltaE: A metric for perceptual color difference. DeltaE is calculated in a perceptually uniform color space and reflects how humans perceive differences between colors. The LegacyColorDifferenceAlgorithm uses DeltaE as its comparison metric. Lower values indicate less perceptible difference.

• Euclidean distance: A comparison algorithm that calculates the per-pixel color distance between two textures using the Pythagorean theorem.

• Luma pipeline: A luminance calculation used by the peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM) algorithms when LumaCalculations is enabled. LumaColorSpaceMode controls how color space conversions are applied during luminance computation.

• Peak signal-to-noise ratio (PSNR): A comparison algorithm that measures the ratio of signal power to noise power between images, expressed in decibels.

• Reference image: A stored image that serves as the expected output for graphics tests. Used as a benchmark to compare against the actual image generated during test execution.

• Structural similarity index (SSIM): A comparison algorithm that evaluates structural similarity between images by considering luminance, contrast, and structure.

Additional resources

• Customize tests
• Graphics test workflow
• Graphics Tests window reference