How to use this test
Inspect the pattern
Look at the lines, gradient and colour blocks at a comfortable zoom.
Download the PNG
Use Download image to save the locally generated file.
Compare elsewhere
Open the saved image in another viewer if a difference matters.
What we check
The page draws the pattern on a canvas and creates the PNG download in the browser.
This can show how the browser renders this particular pattern and handles the local download.
What this test can’t tell you
It is not a display calibration, colour-profile, camera, printer or image-compression test.
Something not working?
The image looks different elsewhere
Different apps can apply colour management, zoom or display settings differently.
The download is blocked
Allow downloads for this site, then try the button again.
Common questions
Is an image uploaded?
No. The image is generated in the browser.
Can it calibrate my display?
No. It is only a practical visual comparison pattern.