HDR (High Dynamic Range)

Tips

  • Standard way: 3 photos at -2,0,+2 EV. Very hard to realistically blend photos wider than 4 EV (automatic tools will either ignore extreme photos or produce unrealistic HDR photos).

Tools

Hugin/enfuse

Does not work correctly with Hugin, better use directly enfuse.

If image were taken with a tripod and are already aligned, directly used enfuse:

#!/bin/bash
 
n_input=$#
inputs=($*)
 
output=`echo ${inputs[0]} | sed -r "s@(.*_[0-9]+)[^/]*\\$@\1@"`-`echo ${inputs[$(($n_input-1))]} | sed -r "s@.*_[0-9]+([0-9]{2})[^/]*\\$@\1@"`.jpg
 
enfuse -o $output ${inputs[*]}
 
# fixme because hugin 2011.04 creates buggy jpg currently
convert $output $output

If you didn't use a tripod, or if the clouds are moving fast, align images before:

#!/bin/bash
 
n_input=$#
inputs=($*)
 
output=`echo ${inputs[0]} | sed -r "s@(.*_[0-9]+)[^/]*\\$@\1@"`-`echo ${inputs[$(($n_input-1))]} | sed -r "s@.*_[0-9]+([0-9]{2})[^/]*\\$@\1@"`.jpg
prefix=AHDR_`echo ${inputs[*]} | sed "s@[ ]*[^ ]*/@_@g"`_
 
align_image_stack -a /mnt/ram/${prefix} ${inputs[*]}
 
enfuse -o $output /mnt/ram/${prefix}*.tif
 
rm -f /mnt/ram/${prefix}*.tif
 
# fixme because hugin 2011.04 creates buggy jpg currently
convert $output $output

LuminanceHDR/Qtpfsgui

  • create new HDR
  • Choose profile ???
  • Choose operator:
    • mantiuk 06
      1. adjust saturation and pre-gamma to get right color
      2. adjust contrast and détails to get something realistic (less contrast and more details is more realistic)
  • adjust levels

Gimp

  • open middle image, rename layer “middle”
  • open dark image, copy content, create layer “dark” in middle image, paste content, anchor
  • desaturate dark image, adjust curves (white is opaque), copy content, add layer mask in “dark” layer, paste content
  • open bright image, copy content, create layer “bright” in middle image, paste content, anchor
  • desaturate bright image, adjust curves (black is opaque), invert, copy content, add layer mask in “bright” layer, paste content
photo/hdr.txt · Last modified: 2013/09/19 16:40 (external edit)
 
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