High-dynamic-range imaging (HDRI or HDR) is a technique used in imaging and photography to reproduce a greater dynamic range of luminosity than is possible with standard digital imaging or photographic techniques. The aim is to present the human eye with a similar range of luminance as that which, through the visual system, is familiar in everyday life. The human eye, through adaptation of the iris (and other methods) adjusts constantly to the broad dynamic changes ubiquitous in our environment. The brain continuously interprets this information so that most of us can see in a wide range of light conditions. Most cameras, on the other hand, cannot.
HDR images can represent a greater range of luminance levels than can be achieved using more 'traditional' methods, such as many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae. This is often achieved by capturing and then combining several different narrower range exposures of the same subject matter. Non-HDR cameras take photographs with a limited exposure range, resulting in the loss of detail in highlights or shadows.
The proprietary HDRi data format is a 64bit (color) or 32bit (greyscale) data format for saving RAW data of HDR scans including infrared data in a TIFF container developed by LaserSoft Imaging.
Some image scanners, especially film scanners provide an additional infrared channel. The data it collects during a scan can be used for image optimization, e.g. for scratch and dust removal. The infrared RAW data and the usual image RAW data get saved in the HDRi data format, where 16bit per color channel are used for every pixel and additional 16bit for the infrared channel. Thus, a HDRI color file devotes resources of 64bit per pixel and a HDRi greyscale file 32bit per pixel.
The infrared RAW data is saved lossless with the image RAW data. Therefore, it isn't necessary to process them while scanning. This facilitates the digitalization of larger archives. Afterwards, the so filed originals can be post processed at any time with dust and scratch removal, possibly in batch mode.
I love You, Lord, I worship You
I love You, Lord, always
So thankful Lord, You saved my life
You saved my life today
Let me be a shining light for You
Let me be a joy to You always
Let me be a shining light for You
Let me be a joy to You always, yeah, yeah
No Superman, I'm no hero
I'm just a man in Your eyes
But through Your son I've overcome
The Father of all lies
Let me be a shining light for You
Let me be a joy to You always
Let me be a shining light for You
Let me be a joy to You always, yeah, yeah, yeah
Hallelujah, Hallelujah
Hallelujah, Hallelujah
No Superman, I'm no hero
I'm just a man in Your eyes
But through Your son I've overcome
The Father of all lies
Let me be a shining light for You
Let me be a shining light for You
Let me be a joy to You always
Let me be a shining light for You
Let me be a joy to You always
Let me be a shining light for You
Let me be a joy to You always
Let me be a shining light for You
Let me be a joy to You always
Let me be a joy to You always
Let me be a joy to You always
I wanna be a joy to You always
Let me be a joy to You always
Hallelujah, Hallelujah