Whats HDR
High Dynamic Range photography
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 will allow.
The intention of HDRI is to accurately represent the wide range of intensity levels found in real scenes ranging from direct sunlight to shadows.
High dynamic range imaging was originally developed in the 1930s and 40s 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 computer screen.
Examples:
This is a normal correctly exposed image direct from the camera:-
The image is ok, but it lacks any real sort of impact. The colours and textures of the tree's, sky and foreground are very bland and dull looking.
After HDR technique:-
Now the image has a nice feel about it. All the colours and textures are visible giving the whole image a real vibrant glow.
For me personally i dont see HDR techniques as really messing with images, not to the point of hiding or adding things that were or maybe were not really there.
I see it as being able to highlight or suppress whats already in the image, allowing the photo to glow rather than to change its entire makeup..
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 will allow.
The intention of HDRI is to accurately represent the wide range of intensity levels found in real scenes ranging from direct sunlight to shadows.
High dynamic range imaging was originally developed in the 1930s and 40s 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 computer screen.
Examples:
This is a normal correctly exposed image direct from the camera:-
The image is ok, but it lacks any real sort of impact. The colours and textures of the tree's, sky and foreground are very bland and dull looking.
After HDR technique:-
Now the image has a nice feel about it. All the colours and textures are visible giving the whole image a real vibrant glow.
For me personally i dont see HDR techniques as really messing with images, not to the point of hiding or adding things that were or maybe were not really there.
I see it as being able to highlight or suppress whats already in the image, allowing the photo to glow rather than to change its entire makeup..