Merging HDR causes artifacts in highlights

[francoisantoine]

Hi. I am on OSX. When I merge 3 bracketed CR2s together I get: -a highly overexposed EXR like this:

-when I readjust the EXR's exposure I get clipped highlights

The CR2s come from a Canon 5D Mark III with 3EVs between brackets, the middle bracket being properly exposed. I'm not using any command line arguments.

Please let me know if I am missing a key part here. Thanks!

[KelSolaar]

Hi,

This seems like artefacts coming from sensor saturation as discussed in #3.

Cheers,

Thomas

[francoisantoine]

Thanks for the reply! Because I am capturing an intense specular hit from the sun in all 3 brackets, those pixels will be saturated in all of them - so HDRmerge won't deal with that merge properly. The other ticket mentions using DCraw to develop the CR2s, but HDRmerge only supports RAW inputs so that sounds like it would need a code change?

Any other suggestions getting around this issue using external tools that I can pipeline in? I really like that HDRmerge doesn't add any of the 'embellishments' that other tools do.