Dan's "Black Hole" image
Dan Margulis <76270.1033@...>
appears in Professional Photoshop 6. Interestingly, the "before" versionI finally got a chance to see the digital photo of the "black hole" that
did *not* print as solid black-- if I hold the book at an angle to the
light (to avoid glare), I can actually see most of the detail that shows up
in the "after" version. It's very dark, but it's there.>>
Well, *something* has to be there; even I can't fix an image that's 0,0,0
throughout. But I thought that the result when the range was opened up was
astonishing. I expected it to be full of noise. In fact, the result was a
lot better than one would get with a drum scan of a similarly dark piece of
a film--the scanner would have latched onto the film grain.
That particular image really should give pause to people who are obsessed
with extra bits. It's quality, not quantity, of data, that counts. That
corrected image can be expressed in 5 bits per channel.
(And maybe a tripod to keep the camera steady?)>>Could the original have been improved by using a longer exposure?
Certainly, but that wasn't the point of the exercise, which was to get
something nearly hopelessly black and see what was actually there.
the web) that use images as challenging as this one.>>I'd like to see reviews of digital cameras (either in print or on
Good luck. First of all, the technology is improving so rapidly that almost
any review is obsolete by the time it appears. Second, you don't often see
reviews of either cameras or scanners written by people who are
particularly knowledgeable about the subject. Third, few if any reviewers
see these cheap digitals as the revolution that they are, and the rest
insist on comparing them to previous film-based products.
Ron Bean <rbean@...>
Dan Margulis <firstname.lastname@example.org> writes:
That's why I suggested a website.the web) that use images as challenging as this one.>>I'd like to see reviews of digital cameras (either in print or on
Second, you don't often seeTrue, but it only takes one...
Third, few if any reviewersWell, there are a couple of magazines devoted to consumer-level
digital cameras, and they don't give a flip about film.
The photos they've published in the past aren't that impressive,
but that could change as the technology improves-- especially if
a few of them would read your book...