Redirect to Home Entertainment Center

 There is much information on the movie aspect of media at my Home Entertainment Center blog.

Most of my interest, currently, is in video rather than stills.



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HDR history

   As a precursor, let me reiterate, these blogs are for intelligent people with a university background and courses in mathematics, engineering, physics and other of the hard sciences.    The first HDR image was the result of the independent work of Prof. Paul Debevec, U.C., and Gregory Ward Larson, JPL.    Prof. Debevec developed an algorithm to composite several images into one. His work was published in a research paper still available online. In the back of the paper is a Matlab script of the algorithm. Matlab is published by Mathworks, Inc, and is the foremost mathematics laboratory,  Matlab is widely used by scientists and professionals in a science related field.    One of the unknown benefits in HDR is the ability two construct an HDR image with only two exposures (images) if the same film is used for several images. Prof. Debevec derived an additional algorithm for determining the film character and using that data to reduce the number of images needed for a HDRI (High Dy
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HDR : myths and misinterpretations

   I've become aware of widespread  disinformation on HDR. Reviewers of video products and software make claims based on an incomplete and faulty understanding of HDR.    HDR does this, HDR does that, HDR will do this and that.    Many such people do not understand the difference between an HDR image and the compressor that makes the image viewable and printable. The HDR is the attempted storage of  an aspect of 'reality'. This 'reality' is too much for computer displays and printers so someone writes compression software to make the HDR acceptable, i.e., viewable on monitors and printable on printers. There are an infinite number of ways to do this. The HDR image you see and like so much may have been compressed by a different method than the same HDR another person may see, resulting in two visually different images.    This boils down to a matter of interpretation. Much of what is being attributed to HDR images is really the effect of different compressors,
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August 14, 2019 update

A lot has happened since the last post. I have acquired a Konica Minolta MAxxum 5D, replete with strap, charger and rechargable batteries. Everything works...exfept the CCD. All the pictures taken are blacked out. There's no visible physical damage to the unit. I'm considering opening up the unit and perhaps looking for a loose connection caused by a drop of the camera. I located and downloaded  a service manual with diagrams and service data. I want to continue some exploration of HDR imaging. To this end, I combined my interest in my cell phone's cameras with my HDR interest and found a few programs that seem to do a good job at HDR or providing the needed lo-res images for assembling an HDR image. I prefer the assembly method. The tonemap compressor from Radiance, programmed by Eric Reinhard, is the best general purpose compressor I've run across in the years of working, albeit intermittently, with HDR. The apps for the phone are from the Apple AppStore an
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