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hdrmerge: combine images of different exposures to recover high dynamic range radiance maps

combine multiple images of the same composition into a single hdr image. this module is best applied before demosaic but after denoise.

this reads the shutter speed from the image to perform the calculation. to perform the hdrmerge, take multiple still photos at same position with varying shutter speeds. keep the aperture and iso constant across shots.

for radiance map output, it may be beneficial to put a reinhard tonemap before the filmcurv and adjust the light param on the filmcurv module to the desired value

in exposure mode, the output is radiance multiplied by average shutter speed plus the ev push.

parameters

• pltscale axis scale of dspy plot
• output either exposure or radiance
• exposure for exposure output mode

connectors

• input the primary input. note, the camera properties will be passed through this input
• input2 the secondary input to merge with
• input3 (optional) the third input to merge with
• input4 (optional) the fourth input to merge with
• input5 (optional) the fifth input to merge with
• input6 (optional) the sixth input to merge with
• output output of the merged images. either exposure or radiance
• dspy a log-log plot of log irradiance (lnE) vs the pixel output (Z)

technical

This module is partly a re-implementation of https://github.com/wjakob/hdrmerge which is licensed under the GNU General Public License (Version 3), which can be retrieved at the following address: http://www.gnu.org/licenses/gpl-3.0.txt