I have learned to appreciate photos as an amateur
photographer. I wonder - How did they get that shot?
How did they get that lighting? - or - WOW that
photo really looks great and almost jumps off the page.
Recently I found a photo of the Atlanta midtown skyline
that had that affect on me. I knew it had been
altered or doctored. I asked my brother, a
photographer professional, what he thought and he said it is accomplished with a
technique called HDR.
My test example is a BLACK piano on a WHITE floor and
relatively bright room. For me it is tough to get it
all to work together. Either the piano is a black
hole in a normal room, or the room is blasted bright and
the piano appears more normal. HDR makes an
interesting photo taking lighting from all three photos
especially intensifying reflections on the shiny dark
I am exploring the technique and am just starting to use it.
Below are three photos of my piano and the HDR result.
It is an exciting effect. I will share my progress
with this tool in future blogs.
In image processing, computer graphics, and photography,
high dynamic range imaging (HDRI or just HDR) is a set of
techniques that allows a greater dynamic range of
luminances between light and dark areas of a scene than
normal digital imaging techniques. The intention of HDRI
is to accurately represent the wide range of intensity
levels found in real scenes ranging from direct sunlight
High dynamic range imaging was originally developed in the
1930s and 1940s by Charles Wyckoff. Wyckoff's detailed
pictures of nuclear explosions appeared on the cover of
Life magazine in the mid 1940s. The process of tone
mapping together with bracketed exposures of normal
digital images, giving the end result a high, often
exaggerated dynamic range, was first reported in 1993,
and resulted in a mathematical theory of differently
exposed pictures of the same subject matter that was
published in 1995 by Steve Mann and Rosalind Picard. In
1997 this technique of combining several differently
exposed images to produce a single HDR image was presented
to the computer graphics community by Paul Debevec.
This method was developed to produce a high dynamic range
image from a set of photographs taken with a range of
exposures. With the rising popularity of digital cameras
and easy-to-use desktop software, the term HDR is now
popularly used to refer to this process. This composite
technique is different from (and may be of lesser or
greater quality than) the production of an image from a
single exposure of a sensor that has a native high dynamic
range. Tone mapping is also used to display HDR images on
devices with a low native dynamic range, such as a