16-bit Grayscale PNG (deep colour)
A 16-bit (deep-colour) grayscale PNG holding a smooth 0–65535 gradient — for testing high-bit-depth support and spotting banding when a tool truncates to 8-bit.
Images
Images are the most-tested files of all, yet generic sample sites hand you a photo with no documented properties. Here, every image records exactly what it is. The denoise sets pair noisy images with their precise clean reference and document the noise type, sigma, and random seed. A seven-format conversion group carries identical content across JPG, PNG, WebP, GIF, BMP, TIFF, and AVIF for diffing converters. There's a resolution ladder from 16px to 4K plus vertical and extreme aspect ratios, EXIF orientation variants for testing rotation handling, a JPEG quality ladder, greyscale pairs and grey wedges, background-removal fixtures with real alpha channels, and deliberately truncated files for error handling. A set of rendered chart images — bar, line, pie, and scatter with labelled axes and known values — gives chart-extraction, vision, and OCR tools something real to read, and a vector set ships scalable SVGs — a logo, a UI icon, a chart, an animated spinner, and a flat illustration — for testing SVG rendering and vector-to-raster conversion. Clean-versus-noisy and colour-versus-greyscale pairs make before/after testing trivial.
Color And Metadata
Baseline JPEG
The fruit still life as a baseline (sequential) JPEG — paired with a progressive JPEG of identical content for testing decode order and progressive-rendering support.
CMYK JPEG (print colour space)
The fruit still life converted to the CMYK (print) colour space and saved as a JPEG — for testing CMYK decoding and CMYK→RGB conversion. Some web viewers render CMYK JPEGs with a colour shift.
EXIF Metadata Present (JPEG)
A JPEG carrying rich EXIF metadata (camera make/model, software, artist, copyright, timestamp) — paired with an identical metadata-stripped copy for testing EXIF reading and privacy-scrubbing tools.
EXIF Metadata Stripped (JPEG)
The same photo with all EXIF metadata removed — the stripped twin of the EXIF-present JPEG, for verifying that a metadata-scrubbing tool actually removed everything.
ICC sRGB-Tagged JPEG
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.
Progressive JPEG
The same photo as a progressive JPEG (loads coarse-to-fine) — the twin of the baseline JPEG, for testing progressive decoding and byte-order handling.
Untagged (No ICC) JPEG
The same photo saved with no embedded ICC profile — the untagged twin of the sRGB-tagged JPEG, for testing how a tool assumes/handles a missing colour profile.
Greyscale Set
16-Step Grey Wedge
A 16-step greyscale wedge from pure black to pure white, for testing tone reproduction, banding, and monitor calibration.
50% Grey Card
A flat 50% grey card (rgb 128,128,128), a reference for white balance and exposure testing.
Black & White Checkerboard
A pure black-and-white checkerboard, useful for testing scaling, aliasing, and edge handling.
Black-to-White Tonal Ramp
A continuous linear greyscale ramp from black to white, useful for spotting banding and gamma issues.
Fruit Still Life — Colour (512px)
A colour fruit still life (apple, orange, banana, grapes), paired with a true-greyscale conversion — a real-world subject for testing desaturation and how distinct hues collapse to similar greys.
Fruit Still Life — Greyscale (512px)
True 8-bit greyscale conversion of the fruit still life, the paired reference for testing colour-to-grey conversion.
Full-Saturation Hue Bars — Colour (512px)
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.
Full-Saturation Hue Bars — Greyscale (512px)
True 8-bit greyscale conversion of the full-saturation hue bars, the paired reference for testing colour-to-grey conversion.
Gradient Composition — Colour (512px)
A smooth three-channel gradient composition, paired with its greyscale conversion to test luminance handling.
Gradient Composition — Greyscale (512px)
True 8-bit greyscale conversion of the gradient composition, the paired reference for testing colour-to-grey conversion.
Background Removal
Alpha-Channel Reveal (512px)
A left-to-right alpha gradient over a solid colour, for testing how a viewer or compositor renders partial transparency.
Apple — 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.
Apple — Ground-Truth Cut-out (512px)
The ground-truth transparent cut-out of the apple used in the cluttered-background hard case — the ideal output of a perfect background remover.
Apple on Cluttered Background (512px)
An apple on a busy, colour-matched background — the hard input for a background remover or matting model. Score a prediction against the paired ground-truth cut-out and alpha mask.
Coffee Mug — Transparent Cut-out (512px)
The expected transparent cut-out of the coffee mug, paired with the on-background version — the ground truth for a background-removal test.
Coffee Mug on Studio Background (512px)
A coffee mug photographed on a clean studio-white background — the easy input for a background remover, paired 1:1 with its transparent cut-out for scoring.
Coffee Mug with Soft Shadow (512px)
The coffee mug with a soft drop shadow on transparency — tests whether a background remover keeps or discards the contact shadow.
Potted Plant — Fine-Edge Test (512px)
A potted plant with many thin leaves and stems on transparency — the canonical fine-edge test for how cleanly a background remover cuts around delicate foliage.
Semi-Transparent Drinking Glass (512px)
A half-full drinking glass rendered with partial transparency — the hard case for background removers that assume every subject pixel is opaque.
Edge Cases
Animated GIF (8 frames)
An 8-frame looping animated GIF of a moving dot — tests animation handling, first-frame extraction, and GIF parsing.
EXIF Orientation 1 (normal)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 1 (normal). Tests whether your tool honours orientation metadata.
EXIF Orientation 2 (mirror horizontal)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 2 (mirror horizontal). Tests whether your tool honours orientation metadata.
EXIF Orientation 3 (rotate 180°)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 3 (rotate 180°). Tests whether your tool honours orientation metadata.
EXIF Orientation 4 (mirror vertical)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 4 (mirror vertical). Tests whether your tool honours orientation metadata.
EXIF Orientation 5 (mirror + rotate 90° CCW)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 5 (mirror + rotate 90° CCW). Tests whether your tool honours orientation metadata.
EXIF Orientation 6 (rotate 90° CW)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 6 (rotate 90° CW). Tests whether your tool honours orientation metadata.
EXIF Orientation 7 (mirror + rotate 90° CW)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 7 (mirror + rotate 90° CW). Tests whether your tool honours orientation metadata.
EXIF Orientation 8 (rotate 90° CCW)
A JPEG whose pixels are stored identically but whose EXIF Orientation tag is set to 8 (rotate 90° CCW). Tests whether your tool honours orientation metadata.
Extreme Aspect Strip (1×5000)
A 1-pixel-wide, 5000-pixel-tall strip — an extreme aspect ratio for stress-testing layout, scaling, and thumbnail generators.
Intentionally Corrupt — Truncated JPEG
An intentionally corrupt JPEG, truncated to half its bytes, for testing how a decoder handles incomplete image data. This is not a valid image by design.
JPEG Quality 10 (512px)
The same 512px source saved at JPEG quality 10 — part of a q10/50/90 ladder for comparing compression artefacts at a glance.
JPEG Quality 50 (512px)
The same 512px source saved at JPEG quality 50 — part of a q10/50/90 ladder for comparing compression artefacts at a glance.
JPEG Quality 90 (512px)
The same 512px source saved at JPEG quality 90 — part of a q10/50/90 ladder for comparing compression artefacts at a glance.
Vector
Animated Spinner (SVG)
An animated loading spinner using SMIL (animateTransform) — a self-contained animated SVG for testing whether a renderer or converter handles SVG animation, and how it rasterises an animated frame.
Bar Chart (SVG)
A bar chart drawn as vector SVG — axis, gridlines, labelled bars — the scalable counterpart to the raster chart images, for testing SVG chart rendering and vector conversion.
Flat Illustration (SVG)
A flat vector landscape — gradient sky, sun, layered hills, and trees built from bezier paths — a richer SVG for testing gradient and path rendering, thumbnailing, and vector conversion.
Logo (SVG)
A generic sample brand logo as scalable vector graphics — a gradient mark plus a wordmark — for testing SVG rendering, rasterisation, and vector-to-raster conversion. Opens in the in-browser editor.
UI Icon (SVG)
A single stroke-style UI icon (a document) as a 24×24 SVG — the kind of vector icon used in interfaces, for testing icon rendering, recolouring, and SVG-to-PNG conversion.
Raster Formats
APNG — Animated Spinner
A 12-frame animated PNG (APNG) of a rotating arc — a lossless, alpha-capable alternative to animated GIF. Useful for testing APNG support, frame extraction, and GIF↔APNG conversion.
ICO — Multi-Resolution App Icon
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.
PBM — Netpbm Test Image (P4)
A 256×256 fruit still-life image as binary Netpbm P4 (1-bit bitmap) — the minimal, header-plus-raw-pixels family used across Unix imaging tools. For testing Netpbm parsers and conversion.
PGM — Netpbm Test Image (P5)
A 256×256 fruit still-life image as binary Netpbm P5 (8-bit greyscale) — the minimal, header-plus-raw-pixels family used across Unix imaging tools. For testing Netpbm parsers and conversion.
PPM — Netpbm Test Image (P6)
A 256×256 fruit still-life image as binary Netpbm P6 (24-bit colour) — the minimal, header-plus-raw-pixels family used across Unix imaging tools. For testing Netpbm parsers and conversion.
TGA — Truevision Test Image
A 256×256 fruit still-life image saved as uncompressed Truevision TGA — a format common in games and 3D texturing. For testing TGA decoders and conversion to modern formats.
Charts
Bar Chart (PNG)
A clean bar chart of monthly revenue with axis labels, gridlines, and value labels — a real-world fixture for testing chart-extraction and OCR tools, vision models, and thumbnail rendering.
Line Chart (PNG)
A two-series line chart (desktop vs. mobile visitors) with markers, a legend, and gridlines — for testing chart parsing, trend extraction, and image pipelines against a known plot.
Pie Chart (PNG)
A five-slice pie chart of traffic sources with percentage labels and a legend — a real-world fixture for chart-recognition, segmentation, and OCR of embedded text.
Scatter Plot (PNG)
A scatter plot of 120 seeded points (order value versus items per order) showing a positive correlation, with labelled axes — for testing point-cloud extraction and chart parsing.
Denoise Set
Denoise Base A — Clean Reference (512px)
The clean reference image for denoise base A — a fruit still life on studio white. Diff the noisy variants in this set against this file to measure filter accuracy.
Denoise Base B — Clean Reference (512px)
The clean reference image for denoise base B — a coffee mug on studio white. Diff the noisy variants in this set against this file to measure filter accuracy.
Gaussian Noise σ=10 — Base A (512px)
Base A with additive Gaussian noise at σ=10 (seed 4210). Compare against the clean reference in this set to score a denoise filter.
Gaussian Noise σ=10 — Base B (512px)
Base B with additive Gaussian noise at σ=10 (seed 7710). Compare against the clean reference in this set to score a denoise filter.
Gaussian Noise σ=25 — Base A (512px)
Base A with additive Gaussian noise at σ=25 (seed 4225). Compare against the clean reference in this set to score a denoise filter.
Gaussian Noise σ=25 — Base B (512px)
Base B with additive Gaussian noise at σ=25 (seed 7725). Compare against the clean reference in this set to score a denoise filter.
Gaussian Noise σ=50 — Base A (512px)
Base A with additive Gaussian noise at σ=50 (seed 4250). Compare against the clean reference in this set to score a denoise filter.
Gaussian Noise σ=50 — Base B (512px)
Base B with additive Gaussian noise at σ=50 (seed 7750). Compare against the clean reference in this set to score a denoise filter.
Salt & Pepper 10% — Base A (512px)
Base A with 10% salt-and-pepper noise (seed 42010). A direct fixture for testing median and morphological denoisers against the clean reference.
Salt & Pepper 10% — Base B (512px)
Base B with 10% salt-and-pepper noise (seed 77010). A direct fixture for testing median and morphological denoisers against the clean reference.
Salt & Pepper 2% — Base A (512px)
Base A with 2% salt-and-pepper noise (seed 42002). A direct fixture for testing median and morphological denoisers against the clean reference.
Salt & Pepper 2% — Base B (512px)
Base B with 2% salt-and-pepper noise (seed 77002). A direct fixture for testing median and morphological denoisers against the clean reference.
Salt & Pepper 5% — Base A (512px)
Base A with 5% salt-and-pepper noise (seed 42005). A direct fixture for testing median and morphological denoisers against the clean reference.
Salt & Pepper 5% — Base B (512px)
Base B with 5% salt-and-pepper noise (seed 77005). A direct fixture for testing median and morphological denoisers against the clean reference.
Format Set
Format Set — Fruit Still Life (AVIF)
A 1024×1024 fruit still life exported as AVIF — the modern-codec member of the conversion set.
Format Set — Fruit Still Life (BMP)
A 1024×1024 fruit still life exported as BMP — one member of a conversion set that carries identical content across formats, so you can convert one and diff against the others.
Format Set — Fruit Still Life (GIF)
A 1024×1024 fruit still life exported as GIF — one member of a conversion set that carries identical content across formats, so you can convert one and diff against the others.
Format Set — Fruit Still Life (HEIC)
A 1024×1024 fruit still life exported as HEIC — the HEIF/HEVC member of the conversion set, the format modern phones use for photos.
Format Set — Fruit Still Life (HEIF)
A 1024×1024 fruit still life exported as HEIF — the HEIF/HEVC member of the conversion set, the format modern phones use for photos.
Format Set — Fruit Still Life (JPG)
A 1024×1024 fruit still life exported as JPG — one member of a conversion set that carries identical content across formats, so you can convert one and diff against the others.
Format Set — Fruit Still Life (PNG)
A 1024×1024 fruit still life exported as PNG — one member of a conversion set that carries identical content across formats, so you can convert one and diff against the others.
Format Set — Fruit Still Life (TIFF)
A 1024×1024 fruit still life exported as TIFF — one member of a conversion set that carries identical content across formats, so you can convert one and diff against the others.
Format Set — Fruit Still Life (WEBP)
A 1024×1024 fruit still life exported as WEBP — one member of a conversion set that carries identical content across formats, so you can convert one and diff against the others.
Ai Segmentation
Fruit 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.
Fruit 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.
Indexed 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.
Portrait 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.
Portrait Subject — Input (512px)
A cat 'portrait' on a busy background — a portrait-style subject-detection and matting input, paired with its ground-truth mask.
Salient Object — Binary Mask (512px)
The binary ground-truth segmentation mask for the salient robot (white = foreground). Compute IoU / F-score of a predicted mask against this file.
Salient Object — Input (512px)
A robot mascot on a cluttered background — the input for a salient-object-detection or image-matting model. Ground-truth binary mask and trimap ship alongside it.
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.
Resolution Ladder
Resolution — 1080×1920 (vertical 9:16)
A fruit still life rendered at 1080×1920 (vertical 9:16) with a faint registration grid — part of a ladder from 16px to 4K for testing scaling, thumbnail generation, and responsive layout on recognisable content.
Resolution — 16×16 (16px thumbnail)
A fruit still life rendered at 16×16 (16px thumbnail) with a faint registration grid — part of a ladder from 16px to 4K for testing scaling, thumbnail generation, and responsive layout on recognisable content.
Resolution — 1920×1080 (1080p 16:9)
A fruit still life rendered at 1920×1080 (1080p 16:9) with a faint registration grid — part of a ladder from 16px to 4K for testing scaling, thumbnail generation, and responsive layout on recognisable content.
Resolution — 256×256 (256px)
A fruit still life rendered at 256×256 (256px) with a faint registration grid — part of a ladder from 16px to 4K for testing scaling, thumbnail generation, and responsive layout on recognisable content.
Resolution — 2560×1440 (1440p 16:9)
A fruit still life rendered at 2560×1440 (1440p 16:9) with a faint registration grid — part of a ladder from 16px to 4K for testing scaling, thumbnail generation, and responsive layout on recognisable content.
Resolution — 3840×2160 (4K 16:9)
A fruit still life rendered at 3840×2160 (4K 16:9) with a faint registration grid — part of a ladder from 16px to 4K for testing scaling, thumbnail generation, and responsive layout on recognisable content.