Module hdr 

High dynamic range images (Radiance HDR and OpenEXR): decoding to linear floating point and tone mapping for display.

Eagle tone-maps these with Reinhard at an exposure of 1.0 and sRGB output; tone_map does the same per channel: scale by the exposure, c / (1 + c), then the linear to sRGB encode.

Functions

decode_linear

Decodes path to linear RGBA floats, turned by its orientation if any.

is_hdr

Whether ext (lowercase) is a high dynamic range format.

stops_to_exposure

Exposure multiplier for a slider in stops (EV): 2^stops.

tone_map

Tone maps linear img for display: Reinhard at exposure (a multiplier, see stops_to_exposure), sRGB encoded. Alpha is the image’s own, clamped to 0..1 (Radiance files have none, so it is 1).