city streets/nightime

B
Posted By
beaver
Mar 7, 2005
Views
479
Replies
6
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Closed
I want to get some good shots of city streets at night using an OlympusC5000z.

I’ve got the streets, regular nightimes and the camera however it seems that whatever settings I use the image is getting flooded with yellow from the sodium lighting. When I try to correct them afterwards (PS7) there is simply not enough blue channel content to get a balanced image

any advice would be very welcome

as you’ve probably guessed…newbie!

sorry if this is off-topic but there appears to be more expertise here than in most ‘camera’ groups

thanks

B
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J
jjs
Mar 7, 2005
"beaver" wrote in message
I want to get some good shots of city streets at night using an OlympusC5000z.

I’ve got the streets, regular nightimes and the camera however it seems that
whatever settings I use the image is getting flooded with yellow from the sodium lighting.

If they are low-temp sodium lights (and they probably are), you are generally just plain screwed. You see, they have a completely uneven color-curve – peaky light. You will not pull out colors within the yellow gradations. You are going to have to completely fake it using painting/color-replacement techniques. OTOH, if they are _not_ truly sodium lights, then you might try filtering the light at the lens when you take the picture. More on that if you like.
MR
Mike Russell
Mar 7, 2005
beaver wrote:
I want to get some good shots of city streets at night using an OlympusC5000z.

I’ve got the streets, regular nightimes and the camera however it seems that whatever settings I use the image is getting flooded with yellow from the sodium lighting. When I try to correct them afterwards (PS7) there is simply not enough blue channel content to get a balanced image

any advice would be very welcome

as you’ve probably guessed…newbie!

sorry if this is off-topic but there appears to be more expertise here than in most ‘camera’ groups

You’re correct that the blue channel is almost non-existent for images taken under sodium light. One way to get better color from such images is to use the Image>Adjust>Channel Mixer, and copy data from the Green channel to the blue channel. Once you have done this, and curved to open up the shadows a bit, you’ll see a great improvement.
—
Mike Russell
www.curvemeister.com
M
mitch
Mar 7, 2005
A discussion that might help.
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=000jfn

beaver wrote:
I want to get some good shots of city streets at night using an OlympusC5000z.

I’ve got the streets, regular nightimes and the camera however it seems that whatever settings I use the image is getting flooded with yellow from the sodium lighting. When I try to correct them afterwards (PS7) there is simply not enough blue channel content to get a balanced image

any advice would be very welcome

as you’ve probably guessed…newbie!

sorry if this is off-topic but there appears to be more expertise here than in most ‘camera’ groups

thanks

B

J
jjs
Mar 7, 2005
"Mike Russell" wrote in message

You’re correct that the blue channel is almost non-existent for images taken
under sodium light. One way to get better color from such images is to use
the Image>Adjust>Channel Mixer, and copy data from the Green channel to the
blue channel. […]

I just got to catch up on that whole area. Copying green to blue creates a luminance value in blue. Correct? Are we only creating fake blue hue, or are we finding real blue? Sorry, Mike. Maybe I should hit the books for awhile.
MR
Mike Russell
Mar 7, 2005
jjs wrote:
"Mike Russell" wrote in message

You’re correct that the blue channel is almost non-existent for images taken
under sodium light. One way to get better color from such images is to use
the Image>Adjust>Channel Mixer, and copy data from the Green channel to the
blue channel. […]

I just got to catch up on that whole area. Copying green to blue creates a luminance value in blue. Correct? Are we only creating fake blue hue, or are we finding real blue? Sorry, Mike. Maybe I should hit the books for awhile.

The goal is not so much to add blue, but to get rid of the yellow, enough to allow other colors, represented as reds and greens to come through.

The result is far from natural, but quite a surprising number of colors are available. The original two-strip technicolor worked with only reds and greens, and a wash of yellow to make skin tones more natural. —
Mike Russell
www.curvemeister.com
B
beaver
Mar 8, 2005
"mitch" wrote in message
A discussion that might help.
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=000jfn

beaver wrote:
I want to get some good shots of city streets at night using an OlympusC5000z.

I’ve got the streets, regular nightimes and the camera however it seems
that
whatever settings I use the image is getting flooded with yellow from
the
sodium lighting. When I try to correct them afterwards (PS7) there is
simply
not enough blue channel content to get a balanced image

any advice would be very welcome

as you’ve probably guessed…newbie!

sorry if this is off-topic but there appears to be more expertise here
than
in most ‘camera’ groups

thanks

B
many thanks for responses,I will experiment and post link here for further advice, or maybe even plaudits:)

B

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