h d rfiles.meetup.com/1768524/hdr.pdf · raw converter. •click alt > open image. (open image...
TRANSCRIPT
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H D R
Monster or Miracle ?
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H D R What does it mean?
High
Dynamic
Range
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What is it?
A procedure to make your images
show the full range of tones that
were available to your eye at the
moment of capture.
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How does it work ?
The human eye can see the entire range of
tones available in a subject.
The sensor in the camera does the same,
passing ALL the information coming through
the lens to your memory card before any further
in camera processing is done.
However, based on the camera settings you
select, certain areas of the subject may under
or over exposed resulting in loss of detail.
By combining the information in multiple
bracketed exposures, HDR software retrieves
the correctly exposed value for each pixel to
generate an image showing the full tonal range
contained in the subject.
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Is HDR a new
concept ?
NO! Ansel Adams used it in the darkroom by
dodging and burning under the enlarger.
It can be done in Photoshop, albeit laboriously,
via layers and masking.
HDR software provides a more
efficient path to the same result.
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What kind of subjects are
good material for HDR ?
Any image or set of images where just one
photo would show areas either too bright or
too dark to see any detail.
Examples would be building interiors or shady
areas within a bright scene.
Before HDR After HDR
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Why all the bad rap?
Most people’s first exposure to HDR is
through the pages of a photography
magazine.
These images almost always show a over-
saturated “post card” look.
O.K., if that’s what you want to do but…..
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The true value of HDR is that it will allow
the viewer to see the image in a realistic
form, exactly as the photographer saw it.
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What do I need for HDR
photography?
In a perfect world
• A camera that allows bracketed
exposures in aperture priority
• A sturdy tripod
• A stationary subject
• A remote or cable shutter release
•HDR software
In a (not so) perfect world)
A camera that can shoot in RAW
(More on that later)
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How do I do it? •Mount the camera on a tripod.
•Compose the shot.
•Take 3 or more bracketed exposures in
aperture priority.
•At minimum, one under exposed, one normal
and one over exposed.
•Set the camera to allow 1 – 2 stops of
spacing between each exposure.
•Use a remote or cable shutter release.
or
•Take one normal exposure in RAW.
•We will be using the RAW converter to create
the under, normal and over exposed images
that the process requires.
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Why do I have to use
aperture priority if I shoot
multiple exposures for
HDR?
•Using shutter priority or program modes would
cause the camera to use different f-stop
settings.
•This would result in a different Depth of Field
in each exposure.
Using aperture priority causes the camera to
use different shutter speeds to achieve the
bracketed exposures.
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Why do I have to have a
stationary subject for
HDR?
•Because objects moving in the composition
would cause blur when merged together.
•The only exception would be creating multiple
bracketed exposures from a single RAW
image.
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There was something
moving in the scene or I
could not use a tripod so I
was only able to get one
RAW image. How do I
create a bracketed set?
Use the Adobe RAW® converter
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•Open your single raw image with the
RAW converter.
•Click Alt > Open image. (open image
changes to open copy)
•Save as a JPG or TIF. (use an name
like “image-N“)
•Open your original RAW again and
increase exposure by 2 stops.
•Click Alt > Open image and save as
“image-H”.
•Open your original RAW one more time
and decrease exposure by 2 stops.
•Press Alt > open image and save as “image-L” .
You now have the multiple exposures required
for the HDR process.
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What software do I need?
The three most used HDR applications are:
Photomatix® www.hdrsoft.com
Adobe Photoshop CS5® and Elements®(v.9 on)
www.adobe.com
Nik HDR Effects® www.niksoftware.com
We are going to use Photomatix® for this example. The others follow similar
procedures
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We will be working with a
bracketed set of 3 images.
Normally exposed
Notice that the detail is lost in the dark areas but
the Ferris Wheel looks pretty good except for the
too bright center.
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Over exposed
This one will provide the detail lost in the
normally exposed image.
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Under exposed
This one will help retrieve detail in the street lights
and center of the Ferris Wheel
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Open the Photomatix® application
Click Load Bracketed Photos
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Click Browse and select the 3 bracketed images
Click OK
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Accept the defaults and click OK
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Each of the presets along the bottom row
represent adjustments to the slide controls on the
left side.
You can watch the Histogram change as you
move from preset to preset.
You can also adjust the slide controls manually.
When you are pleased with the settings,
click Process
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Now you can click FILE > SAVE AS either a
TIF or JPG
Further adjustments can be made in
Photoshop
Here are some selected examples of HDR
enhancement
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Here is the adjusted image
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Before
After
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Before
After
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Before
After
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Before
After
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Before
After
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That’s All Folks!
© Mike Fleckenstein 2011
Thanks!