Salient Object — Matting Trimap (512px)
A three-level matting trimap (black = background, grey = unknown edge band, white = foreground) for the salient robot — the standard auxiliary input for alpha-matting methods.
Specifications
- Width
- 512
- Height
- 512
- Mode
- L
- Levels
- 0 bg / 128 unknown / 255 fg
- Role
- trimap
What is a .png file?
PNG (Portable Network Graphics) is a raster image format using lossless DEFLATE compression. It supports full 8- or 16-bit-per-channel truecolor, palette, and greyscale modes with an optional alpha channel, but no animation. It is the standard choice for screenshots, logos, and graphics with sharp edges or transparency.
How to use this file
Use an example PNG to test image decoders, alpha-compositing, thumbnail generators, and format converters, or to verify that a pipeline preserves transparency and color depth on round-trip.
How to use this file for testing
“Salient Object — Matting Trimap (512px)” is a deterministic Novus Examples fixture for Image matting, Image segmentation. Subject images paired with soft-alpha mattes and trimaps (fur, mesh, glass edges) — for testing image-matting models and alpha extraction against a known ground truth.
Documented properties for this file: 512×512 · trimap. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
For image AI or enhancement tools, run the model or filter on this file and diff against the clean or ground-truth companion in the same group when available. Keep seeds and documented damage parameters in your evaluation notes so regressions are attributable.
Use the RGB input with its mask or soft-alpha companion. Class IDs and edge kinds are documented in specs — score IoU or boundary error against that ground truth, not a hand label.
Code examples
<img src="salient-trimap.png" alt="Example image" width="640" loading="lazy">Related files
- pngPortrait Subject — Input (512px)A cat 'portrait' on a busy background — a portrait-style subject-detection and matting input, paired with its ground-truth mask.
- pngFruit Still Life on Clutter — Instances (512px)The same four-object fruit still life on a cluttered background — the hard input for instance segmentation and object detection. The indexed instance mask gives per-object ground truth.
- pngFruit Still Life on White — Instances (512px)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.
- pngIndexed Instance Mask — 4 Objects (512px)An indexed (palette) instance mask for the fruit still life: background = 0 and each fruit painted with its own instance id. Per-object class and normalised bounding box are listed in the specs.
- pngPortrait Subject — Binary Mask (512px)The binary ground-truth mask for the portrait subject (white = foreground) — the reference for scoring a portrait cut-out or background blur.
- pngApple — Ground-Truth Alpha Mask (512px)The binary ground-truth alpha mask (white = subject, black = background) for the cluttered-background apple — compute IoU or boundary F-score of a predicted mask against this file.
Generated by generation/images_ai.py. Free for any use, no attribution required — license.