Hi, I would like to share this attempt to do an hdr from three exposures.
I used three images from the five ones attached in this post: -2, 0, +2 (3008, 3010 and 3012 files below)
1 - Darktable - I used the default setting and saved tifs
2 - align_image_stack - I aligned tifs from previous step
3 - Gimp - I opened aligned tifs from previous step as layers. I used the 0 EV image as background layer. Then I created luminosity masks from the 0 EV image. I used the MM channel to mask the +2 EV and the DD (or DDD, not sure…) to mask the -2 EV.
4 - Darktable - Final touches.
I basically followed the Basic Landscape Exposure Blending with GIMP and G’MIC tutorial by Ian Cylkowski, as well as Pat David’s article on luminosity masks.
The main issue with the final result is the appearance of halos in the top tree (which, I believe, are related to the fact that this was another hand held shooting and there are some alignment issues). Although I followed Ian’s steps to prevent halos, I couldn’t get rid of them in this image (clearly seen at 100% zoom).
I tried to attach gimp xcf file, but it is 500 MB.
Finally, I’m not sure how you will see this image, because I’m working on a low end Dell laptop, no monitor calibration at all. Opening the images on a Lenovo ThinkCentre desktop show them with a strong green hue, especially on which should be a yellow wall at left.
I hope you guys find these images interesting to work on.
Btw, this is Rio de Janeiro, Brazil, near downtown.
CRW_3008.DNG.xmp (2.4 KB)
CRW_3012.DNG.xmp (3.5 KB)
CRW_3011.DNG.xmp (3.5 KB)
CRW_3010.DNG.xmp (3.5 KB)
CRW_3009.DNG.xmp (3.5 KB)
CRW_3010.DNG (17.8 MB)
CRW_3012.DNG (17.8 MB)
CRW_3008.DNG (17.8 MB)
CRW_3011.DNG (17.8 MB)
CRW_3009.DNG (17.8 MB)