Faint horizontal lines on 300D images

I noticed some faint horizontal lines on a 300D print yesterday. I had
seen them on my new CRT monitor previously but I assumed that it was a
CRT oddity (I'm still getting used to moire after using an LCD for 3-4
years). At the time of the print I thought that I had a blocked jet,
but after some more editing just now I've realised that since both the
CRT and printer display it, the issue appears to be with the camera.

Is this normal? It shows in areas where there is a fair amount of one
colour, like sky. I'm hoping it's a normal quirk of the sensor rather
than something more serious like a half dead multiplexing transistor.

Here's a sample 1:1 crop of some sky, it's not the best example but
hopefully the lines are apparent.

http://media.sensationcontent.com/ro...ntal-lines.tif

"Rowan Crowe" wrote in message
om...


http://media.sensationcontent.com/ro...ntal-lines.tif

i'd love to eyeball the pic, but no way I'm going to download a tif of
indeterminate size.. you have a resampled small jpeg or a jpeg crop of the
offending area you could post?

k

"Rowan Crowe" wrote in message
om...
I noticed some faint horizontal lines on a 300D print yesterday. I had
seen them on my new CRT monitor previously but I assumed that it was a
CRT oddity (I'm still getting used to moire after using an LCD for 3-4
years). At the time of the print I thought that I had a blocked jet,
but after some more editing just now I've realised that since both the
CRT and printer display it, the issue appears to be with the camera.

Is this normal? It shows in areas where there is a fair amount of one
colour, like sky. I'm hoping it's a normal quirk of the sensor rather
than something more serious like a half dead multiplexing transistor.

Here's a sample 1:1 crop of some sky, it's not the best example but
hopefully the lines are apparent.

Can't tell from your sample. I have a 300D and sometimes get faint
horizontal lines from my printer, but never see them on my monitor.

(Rowan Crowe) wrote:

http://media.sensationcontent.com/ro...ntal-lines.tif

Zip. Mark up the image (draw some arrows or whatever) to point to
what you see. Otherwise, the only remarkable artifacts in this image
are due to JPEG, which you must already know about.

Rowan Crowe wrote:
I noticed some faint horizontal lines on a 300D print yesterday. I had
seen them on my new CRT monitor previously but I assumed that it was a
CRT oddity (I'm still getting used to moire after using an LCD for 3-4
years). At the time of the print I thought that I had a blocked jet,
but after some more editing just now I've realised that since both the
CRT and printer display it, the issue appears to be with the camera.

Is this normal? It shows in areas where there is a fair amount of one
colour, like sky. I'm hoping it's a normal quirk of the sensor rather
than something more serious like a half dead multiplexing transistor.

Here's a sample 1:1 crop of some sky, it's not the best example but
hopefully the lines are apparent.

http://media.sensationcontent.com/ro...ntal-lines.tif

My personal guess is that you shot that image at a high ISO and that the
camera applied a lot of colour noise reduction. When you apply a lot of
colour noise reduction you get that effect.
--

Alfred Molon
------------------------------
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Rowan,
Can you go into photoshop and look at the individual red, green, and blue
channels? You may find one of them is inordinately noisy. But post a full
size JPG or a crop (at 100%) then maybe we could figure it out.

"Rowan Crowe" wrote in message
om...
I noticed some faint horizontal lines on a 300D print yesterday. I had
seen them on my new CRT monitor previously but I assumed that it was a
CRT oddity (I'm still getting used to moire after using an LCD for 3-4
years). At the time of the print I thought that I had a blocked jet,
but after some more editing just now I've realised that since both the
CRT and printer display it, the issue appears to be with the camera.

Is this normal? It shows in areas where there is a fair amount of one
colour, like sky. I'm hoping it's a normal quirk of the sensor rather
than something more serious like a half dead multiplexing transistor.

Here's a sample 1:1 crop of some sky, it's not the best example but
hopefully the lines are apparent.

http://media.sensationcontent.com/ro...ntal-lines.tif

My personal guess is that you shot that image at a high ISO and that the
camera applied a lot of colour noise reduction. When you apply a lot of
colour noise reduction you get that effect.

Sure looks noisy. Even just the interaction of jpeging and noise might
produce strange artefacts.

Kibo informs me that (Rowan Crowe) stated
that:

Is this normal? It shows in areas where there is a fair amount of one
colour, like sky. I'm hoping it's a normal quirk of the sensor rather
than something more serious like a half dead multiplexing transistor.

Here's a sample 1:1 crop of some sky, it's not the best example but
hopefully the lines are apparent.

http://media.sensationcontent.com/ro...ntal-lines.tif

The only faults I can see in that crop are lots of fine (5-10 pixel)
compression artifacts, that look a bit like lots of tiny scratches. If
that's what you're talking about, the problem is that you're
over-compressing your images. If you're shooting JPEGs (rather than
RAW), you should check the image quality settings you're using in both
the camera & whatever software you're using to process your photos.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
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