Re: Moon pix - what are these streaks ?
- From: Bob Harrington <zoosqatNOSPAM@xxxxxxxxxxx>
- Date: Thu, 09 Mar 2006 22:40:27 GMT
mianileng@xxxxxxxxx wrote in
news:1141937287.701100.36250@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
I'm new to digital photography and very very rusty with photography in
general. I got my Pana FZ20 last week and have been taking pictures of
the moon at night. Unfortunately there's a lot of seasonal haze (a
mountain range is barely visible from 10km away). This and my lack of
experience make the pictures blurry.
Anyway, I'm puzzled by a feature that consistently shows up in the
shots. Alone, it looks like a small elongated crater with the sun
shining from the side. But they're all over the surface and are all
vertical, not blending with the curvature of the moon. This last
characteristic is what makes them appear unnatural as surface features
of the moon.
I've uploaded a shot taken earlier tonight. Please take a look and let
me know what you think it is. Apart from cropping and enlarging of one
section, the picture is straight out of the box and unretouched. The
URL is
http://photobucket.com/albums/f223/keimah/?action=view¤t=Moon-09M
ar06.jpg
These appear to be imaging artifacts, whether from the sensor itself or
JPEG compression of the output image I'm not certain. I have an older
Sony digital that produces rather objectionable artifacts anywhere there
is a contrasty edge in an image, it seems to be a "feature" of the image
sensor, as these appear in both JPEG and TIFF images.
If your camera has a RAW (or TIFF or BMP) mode, give that a try to see if
the artifacts are still there. Otherwise, set the camera to use the
highest quality (least compression) if it only produces JPEG images.
Another thought. If you are using your camera's "digital zoom" to get
these photos - as opposed to "optical zoom" where only the actual glass
lens is used to magnify the image - digital zoom means the camera crops
into the central area of a larger image, then mathematically enlarges that
cropped section to fill the whole image, simulating the effect of a more
powerful telephoto lens. This in-camera processing unfortunately can
introduce artifacts similar to what you are seeing, and since it is just
making the existing image pixels larger, it doesn't add any real detail to
the final image of the moon.
All that said, it's not such a bad photo at all!
Bob ^,,^
.
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- Moon pix - what are these streaks ?
- From: mianileng
- Moon pix - what are these streaks ?
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