White balance & dull photos

[Myka]

Is there a trick you all use to set the white balance? My camera, a Canon G9, has "manual" white balance where I point to a white area and push a button to set it there. It always seems like it is either too green, too red, or too blue. It is frustrating. Any tricks?

Lately I have been getting a lot of dull looking photos and lots of graininess too. A FTS for example will show a whole bunch of dull colors and then say, red (or green) will be neon in the photo. The neon parts will be out of focus. What the heck? and why the graininess?

Maybe it's time to replace the camera, I'm not sure...

[sphelps]

Are you shooting in Raw mode with your G9? I use the same camera for diving and don't seem to have those issues but the environment is a little different. With manual WB settings you often end up maxing out to one end of the scale which can result in washed out color, you usually need to bump up saturation either on the camera or in post processing to get things right. Also if the tank is too blue no amount of WB adjustment will help, some of the best pictures I've taken are at warmer color temps around 10K or so.

The "graininess" is related to sensor sensitivity, your iso is either set too high or you've got camera issues. Unless you're trying to take a fast shoot to capture motion your iso should be set very low for your tank.

[noy]

The manual/custom WB button is for tuning your WB and best done using white cards (not sure how practical that is in an aquarium setting). I suppose you can put a white plastic card in your tank and use that as a white reference.

Graininess is often because the ISO setting is too high and you get distortion from that. Check you photos to see what the ISO setting is. 800 is the highest I shoot at unless the subject is moving. If you use auto ISO - often the camera will push the ISO setting to one that is way too high. I shoot most of my shots using Aperture priority and use a tripod and all fans off so I can shoot with a slower shutter speed and still get sharp photos. If you can keep the ISO below 400 - those are the sharpest shots.

Can you post some photos so we can see what the problem is.

As for white balance - photos taken in actinic lighting will always be too blue. I'm not sure about the G9 but try to shoot in a WB setting that's as close to 10K as possible - you may only go up to 7K but that's a start. Too green - often that is from regular florescent lighting - that's easily fixable with the right WB setting. Sometime the blue in the actinic is just too strong and you will have to do some post shooting white balance adjustments in Photoshop (or some other software like that).

[PFoster]

Originally Posted by noy

The manual/custom WB button is for tuning your WB and best done using white cards (not sure how practical that is in an aquarium setting). I suppose you can put a white plastic card in your tank and use that as a white reference.

Graininess is often because the ISO setting is too high and you get distortion from that. Check you photos to see what the ISO setting is. 800 is the highest I shoot at unless the subject is moving. If you use auto ISO - often the camera will push the ISO setting to one that is way too high. I shoot most of my shots using Aperture priority and use a tripod and all fans off so I can shoot with a slower shutter speed and still get sharp photos. If you can keep the ISO below 400 - those are the sharpest shots.

Can you post some photos so we can see what the problem is.

As for white balance - photos taken in actinic lighting will always be too blue. I'm not sure about the G9 but try to shoot in a WB setting that's as close to 10K as possible - you may only go up to 7K but that's a start. Too green - often that is from regular florescent lighting - that's easily fixable with the right WB setting. Sometime the blue in the actinic is just too strong and you will have to do some post shooting white balance adjustments in Photoshop (or some other software like that).

Agree with all of the above!


What lighting as you currently trying to shoot under?
The blue in some LED fixtures can be very hard to shoot under....

[Myka]

Thanks for the replies!

I am not shooting in RAW. I don't know how to process them afterwards. I only use Picasa for photo editing, I don't have Photoshop. I don't understand what RAW even is...

I shoot in manual mode. Usually ISO is 200 or sometimes 100. I try to use the manual WB button, but rarely seem to be able to get it very good. I try to adjust with Picasa, but often the pics are beyond help.

The tank I have the most trouble with has T5s heavy in the blue - no white bulbs at all - prob around 22,000K. It is also not very bright. Maybe I just need to swap out a blue for a white when I'm taking photos (pain in the butt).

[lastlight]

I've never shot RAW either but software could really help you out.

I use Photoshop. For the most part the only adjustments I make with it are auto colour, auto contrast and auto tone. followed by unsharp mask which sharpens it. Sometimes the effect of each adjustment isn't desired and you can fade each effect from 0 - 100% to find the sweet spot.

[MarkoD]

If you're shooting 100 or 200 ISO you're gonna be at a slow shutter speed and get motion blur which is why it's not sharp

Motion blur either cuz you're hand holding the camera or cuz things in the tank are moving