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A four-object fruit still life (apple, orange, banana, grapes) on white — the easy input for instance segmentation and object detection, paired with an indexed instance mask.
Vertical bars sweeping the full hue circle at maximum saturation, paired with a greyscale version that shows how colours of different hues collapse to similar greys.
True 8-bit greyscale conversion of the full-saturation hue bars, the paired reference for testing colour-to-grey conversion.
Ground-truth RGBA cut-out for the fur-edge hard case.
Synthetic fur-like fibres on a cluttered background — a classic background-removal failure case.
Binary mask for the fur-edge hard case.
Base A with additive Gaussian noise at σ=10 (seed 4210). Compare against the clean reference in this set to score a denoise filter.
Base B with additive Gaussian noise at σ=10 (seed 7710). Compare against the clean reference in this set to score a denoise filter.
Base A with additive Gaussian noise at σ=25 (seed 4225). Compare against the clean reference in this set to score a denoise filter.
Base B with additive Gaussian noise at σ=25 (seed 7725). Compare against the clean reference in this set to score a denoise filter.
Base A with additive Gaussian noise at σ=50 (seed 4250). Compare against the clean reference in this set to score a denoise filter.
Base B with additive Gaussian noise at σ=50 (seed 7750). Compare against the clean reference in this set to score a denoise filter.
Ground-truth partial-alpha glass bottle cut-out.
Semi-transparent glass bottle on clutter — partial-alpha background-removal hard case.
Binary mask for the glass-bottle hard case.
A smooth three-channel gradient composition, paired with its greyscale conversion to test luminance handling.
True 8-bit greyscale conversion of the gradient composition, the paired reference for testing colour-to-grey conversion.
Ground-truth mug cut-out including the transparent handle hole.
Mug with a handle interior hole on clutter — background should show through the handle.
Trimap for the handle-hole mug (black/gray/white) for matting tools.
The fruit still life saved as a JPEG with an embedded sRGB ICC colour profile — paired with an untagged copy for testing colour-management and profile handling.
Mug scene JPEG with an embedded sRGB ICC profile — pair with the untagged twin for colour-management tests.
A Windows ICO containing four square sizes (16/32/48/64 px) of a simple app glyph — the classic favicon/desktop-icon container. Handy for testing icon extraction and multi-size rendering.
A 256×256 identicon-style avatar generated deterministically from the seed “ada-lovelace” — a symmetric 5×5 block pattern like the default avatars on many sites. For testing avatar rendering, placeholder generation, and image pipelines.
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