<div dir="auto"><a href="https://openexr.com/en/latest/_test_images/index.html" rel="noreferrer noreferrer" target="_blank">https://openexr.com/en/latest/_test_images/index.html</a><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">esp. </div><div dir="auto"><br></div><div dir="auto"><a href="https://raw.githubusercontent.com/AcademySoftwareFoundation/openexr-images/main/TestImages/BrightRings.exr" target="_blank" rel="noreferrer">https://raw.githubusercontent.com/AcademySoftwareFoundation/openexr-images/main/TestImages/BrightRings.exr</a><br></div><div dir="auto"><br></div><div dir="auto">where description says</div><div dir="auto"><br></div><div dir="auto">"This RGB image contains a number of rather bright rings, with pixel
values over 1000, on a gray background. The image is useful for testing
how filtering and resampling algorithms react to high- dynamic-range
data. (Some filters, for example, convolution kernels with negative
lobes, tend to produce objectionable artifacts near high-contrast
edges.) Note that the rings in the image are smooth, although on most
displays clamping of the pixel values introduces aliasing artifacts. To
see that the rings really are smooth, view the image with and exposure
of -10."</div></div>