Re: Combining multiple photographic exposures into an HDR image

Am 21.09.2007 19:59 postulierte Jeff Mather folgendes:
Here's how to create an HDR from several coregistered LDR images, in its most basic form:


(1) Load each LDR image and its exposure information.

(2) Exclude over- and underexposed pixels.

(3) Divide the LDR image by its exposure (relative to a baseline image) to move all of the images into the same exposure scale.

(4) Average the properly exposed pixels. The number of input pixels that contribute to each output pixel may vary.

First, thanks to all who answered!

That step 3 Jeff mentioned is what made me wonder: Most programs I've seen use the EV value to classify the images. But how, exactly does the exposure value correspond to the pixels in the high dynamic range file.

I'll go meditate on this and check out the web resources posted here.

As I said: Thanks for the help!
Regards,
Markus
.

Relevant Pages

  • Re: Combining multiple photographic exposures into an HDR image
    ... I'm searching for information about how to combine multiple photos with different exposures into an HDR image. ... Exclude over- and underexposed pixels. ... Divide the LDR image by its exposure to move all of the images into the same exposure scale. ...
    (sci.image.processing)
  • Re: D200 owners, pls. do this test for me (and yourselves)
    ... I don't have a D200 and can't comment on the blooming, ... opposed to dead pixels). ... As for the dead pixels: 20+ sounds excessive and more showing up is ... But the big surprise came when I tried to do a long exposure of ...
    (rec.photo.digital.slr-systems)
  • D200 owners, pls. do this test for me (and yourselves)
    ... pixels started dying. ... But the big surprise came when I tried to do a long exposure of ... On viewing the four corners and top edge of the frame ... I would ask you to do the following simple test: Put a body cap ...
    (rec.photo.digital.slr-systems)
  • Re: D200 owners, pls do a test for me (and for yourselves)
    ... First I had three dead pixels remapped, ... shocked to find that all four corners and the top of the frame were luminous ... more and more being "blown out" and luminescing as the exposure lengthened. ... Go in a dark room, put a body cap on to stop any light from ...
    (rec.photo.digital.slr-systems)
  • Re: D200 owners, pls do a test for me (and for yourselves)
    ... but afterward pixels started dying. ... And the whole frame was studded ... more and more being "blown out" and luminescing as the exposure ... Go in a dark room, put a body cap on to stop any light ...
    (rec.photo.digital.slr-systems)