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A tutorial into how to shoot and then post produce a
          High Dynamic Range Photograph
Shooting in High Dynamic Range

A High Dynamic Range Image is composed of 3 to 7 of the same image at different
exposures. Each image is at perfect exposure for every level of brightness in a scene.
How we adjust the exposures is critical. If we kept the shutter speed constant and
adjusted the aperture, this would give us varying Depths of Field–an unwanted
characteristic. We want all the shots to look the same, only varying in exposure. We
could vary the ISO, but higher ISOs add more noise and we want as noise-free an
image as possible. Since HDR is an additive process any noise will be multiplied. So
that leaves us with one choice: Shutter Speed. Ensure you set your file format to
RAW.

To begin setting up your HDR photo shoot, set your camera on a sturdy tripod. This
will ensure each image in the sequence is exactly the same. Set your ISO for the
lowest noise and set your aperture for f16.

Obviously the shutter speed depends on the light you shoot in an estimate would be

1/6 - 1/10 – 1/20 – 1/40 - 1/60 - 1/160
Take your images
 on a variety of
 different shutters.




 Remember to not
 forget about
 composition and
 the visual quality




These are the type of
exposures your are
looking for. None are
totally black (under
exposed) and none
are totally white
(over exposed)
To open the images in Photoshop and merge them to HDR, we will go to File >
Automate > Merge to HDR
We will choose our RAW images to merge to HDR.

Click the box for ‘Attempt to Automatically Align Source Images’.
Select ‘OK’ and Photoshop will go to work.

This will ensure all your images merge together but then we must edit colour and tone
to ensure real life is put into the image.
•   A new screen will pop up. If at this point we wanted to save
    the 32-bit HDR image we would just click ‘OK’ and save as a
    ‘Radiance HDR’ file. But since we want to get straight into
    Tone Mapping we will drop down the ‘Bit Depth’ list to ’16
    Bit/Channel’ and select ‘OK’.
•   Photoshop will begin the merging process and when it is done
    it will open a new Dialog box called ‘HDR conversion’. Select
    ‘Local Adaptation’ from the drop-down menu, then click the
    down-arrow to expand the dialog window to include the
    ‘Toning Curve’ and ‘Histogram’.
•   Your controls are ‘Radius’ and ‘Threshold’ plus ‘Toning Curve’.
    A good starting point for the Radius is about 150 and the
    Threshold is 1.50. Adjust these back and forth until you get all
    the tones across the image fairly even. Allow time for the
    image to refresh in-between adjustments or you may find
    yourself over-shooting your marks. Don’t be surprised if the
    image looks very flat and lifeless at this point, as we will bring
    it back to life in the next step.
•   Now use the Toning curve to bring more specific areas of the
    image into line with your artistic vision. If you want to find the
    point in the curve for an area you want to work on, move your
    cursor over the image and it will change to the Eye Dropper
    tool. Hover it over the area and click on it. You will see exatly
    where that tone is on the curve line and you can then adjust
    that area up or down by dragging the curve.
High dynamic range photographs
High dynamic range photographs

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High dynamic range photographs

  • 1. A tutorial into how to shoot and then post produce a High Dynamic Range Photograph
  • 2. Shooting in High Dynamic Range A High Dynamic Range Image is composed of 3 to 7 of the same image at different exposures. Each image is at perfect exposure for every level of brightness in a scene. How we adjust the exposures is critical. If we kept the shutter speed constant and adjusted the aperture, this would give us varying Depths of Field–an unwanted characteristic. We want all the shots to look the same, only varying in exposure. We could vary the ISO, but higher ISOs add more noise and we want as noise-free an image as possible. Since HDR is an additive process any noise will be multiplied. So that leaves us with one choice: Shutter Speed. Ensure you set your file format to RAW. To begin setting up your HDR photo shoot, set your camera on a sturdy tripod. This will ensure each image in the sequence is exactly the same. Set your ISO for the lowest noise and set your aperture for f16. Obviously the shutter speed depends on the light you shoot in an estimate would be 1/6 - 1/10 – 1/20 – 1/40 - 1/60 - 1/160
  • 3. Take your images on a variety of different shutters. Remember to not forget about composition and the visual quality These are the type of exposures your are looking for. None are totally black (under exposed) and none are totally white (over exposed)
  • 4. To open the images in Photoshop and merge them to HDR, we will go to File > Automate > Merge to HDR We will choose our RAW images to merge to HDR. Click the box for ‘Attempt to Automatically Align Source Images’. Select ‘OK’ and Photoshop will go to work. This will ensure all your images merge together but then we must edit colour and tone to ensure real life is put into the image.
  • 5. A new screen will pop up. If at this point we wanted to save the 32-bit HDR image we would just click ‘OK’ and save as a ‘Radiance HDR’ file. But since we want to get straight into Tone Mapping we will drop down the ‘Bit Depth’ list to ’16 Bit/Channel’ and select ‘OK’. • Photoshop will begin the merging process and when it is done it will open a new Dialog box called ‘HDR conversion’. Select ‘Local Adaptation’ from the drop-down menu, then click the down-arrow to expand the dialog window to include the ‘Toning Curve’ and ‘Histogram’. • Your controls are ‘Radius’ and ‘Threshold’ plus ‘Toning Curve’. A good starting point for the Radius is about 150 and the Threshold is 1.50. Adjust these back and forth until you get all the tones across the image fairly even. Allow time for the image to refresh in-between adjustments or you may find yourself over-shooting your marks. Don’t be surprised if the image looks very flat and lifeless at this point, as we will bring it back to life in the next step. • Now use the Toning curve to bring more specific areas of the image into line with your artistic vision. If you want to find the point in the curve for an area you want to work on, move your cursor over the image and it will change to the Eye Dropper tool. Hover it over the area and click on it. You will see exatly where that tone is on the curve line and you can then adjust that area up or down by dragging the curve.