[Cin] openexr test images

[Andrew Randrianasulu]

https://openexr.com/en/latest/_test_images/index.html


esp.

https://raw.githubusercontent.com/AcademySoftwareFoundation/openexr-images/main/TestImages/BrightRings.exr

where description says

"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."
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