Merging a bracket into radiance
Several exposures of one scene, combined into a single radiance map. Each frame is trustworthy over part of the range and useless over the rest, and the weighting function decides which part to believe.
Try this
Drop the darkest frame and watch the highlights blow; drop the brightest and watch the shadows fill with noise. The error readout says what each choice cost.
Where this lab comes from
High Dynamic Range: Merging a Bracket, Then Checking It Against a MeterEighteen exposures of a 17-stop scene, merged into one radiance map, calibrated with a single scale factor fitted on one patch — and then compared with the colorimeter readings taken in the room. The other 47 points land a median of 0.198 stops away, 0.109 stops across the neutral patches, and every large error is at the dark end.
More in the image itself
- One colour per photosite — Throw away two thirds of the colour, then guess it back.
- Hitting the colour a meter measured — Drag the gains and watch ΔE against 22 metered patches.
- Sixteen by twelve real pixels — Hover a pixel, read its index and its three numbers.