png307 B
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.
Specifications
- Width
- 1
- Height
- 5000
- Aspect Ratio
- 1:5000
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.
Related files
- gifAnimated GIF (8 frames)An 8-frame looping animated GIF of a moving dot — tests animation handling, first-frame extraction, and GIF parsing.
- png16-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.
- png16-Step Grey WedgeA 16-step greyscale wedge from pure black to pure white, for testing tone reproduction, banding, and monitor calibration.
- png50% Grey CardA flat 50% grey card (rgb 128,128,128), a reference for white balance and exposure testing.
- pngAlpha-Channel Reveal (512px)A left-to-right alpha gradient over a solid colour, for testing how a viewer or compositor renders partial transparency.
- jpgBaseline JPEGThe fruit still life as a baseline (sequential) JPEG — paired with a progressive JPEG of identical content for testing decode order and progressive-rendering support.
Generated by generation/images_edgecases.py. Free for any use, no attribution required — license.