Re: Free Utility That Displays RAW Pixels?

Paul Allen <paul.l.allen@xxxxxxxxxxxxxxxxxx> wrote:
On Thu, 16 Aug 2007 08:25:07 -0800
floyd@xxxxxxxxxx (Floyd L. Davidson) wrote:
[... about using dcraw to reveal the Bayer pattern ...]

I haven't thought of an easy way to convert it to color,
though. But if nothing else, converting it to a text
based PPM format should make it possible to do with just
text editing tools.

How 'bout this:

Shoot raw images of red, green, and blue targets and convert them
using "dcraw -D". Blow them up in an image editor to see which
pixels "light up" for each color. Then hack a little loop to read
PGM and output PPM with the pattern imposed. Use that to
"colorize" more interesting raw files that have been converted
with "dcraw -D". Sounds like a fun way to spend a rainy afternoon
in Seattle. :-)

Well, thank goodness, I don't live in Seattle! (I was
born in Bremerton. And today, not at all by accident, I
live in a place that gets less than 5 inches of rain per
year... ;-)

Actually, I did just about exactly that, down to the
point of working out a shell script that did everything
except implement the pattern. When it occurred to me
how tedious it was going to be to come up with the
algorithm to switch colors in at the right times
(basically by counting pixels)...

Well, I decided to quit that an go do something truely
useless. Take pictures, take a nap, eat ice cream, go
for a swim in the ocean... anything that didn't involve
thinking about the pattern that pixel counter needed to
match.

--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@xxxxxxxxxx
.

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