how to do white balance underwater w digital camera?

Archived from groups: rec.photo.digital,rec.scuba.equipment (More info?)

In article <1125516058.851900.51620@f14g2000cwb.googlegroups.com>,
<marmagi@gmail.com> wrote:

€ Hello,
€
€ Can you please tell how pratically I can do the white balance
€ adjustment with the canon ixus 700 digital camera underwater?
€
€ Please explain me if I better do it at the depth I will work on ? I
€ will have to repeat it if I get to shallower?
€
€ Please explain me how to do it, I need to take a white tablet with me ?
€
€ Thanks,
€
€ Mario
€

For consistancy, yes. You might also consider these:

http://www.warmcards.com/

Archived from groups: rec.photo.digital,rec.scuba.equipment (More info?)

Um....I have them and use them....but under water?

--
Thanks,
Gene Palmiter
(visit my photo gallery at http://palmiter.dotphoto.com)
freebridge design group
www.route611.com & Route 611 Magazine
"Alan Street" <agstreet@nonono_san.rr.com> wrote in message
news:310820051349240594%agstreet@nonono_san.rr.com...
> In article <1125516058.851900.51620@f14g2000cwb.googlegroups.com>,
> <marmagi@gmail.com> wrote:
>
> ? Hello,
> ?
> ? Can you please tell how pratically I can do the white balance
> ? adjustment with the canon ixus 700 digital camera underwater?
> ?
> ? Please explain me if I better do it at the depth I will work on ? I
> ? will have to repeat it if I get to shallower?
> ?
> ? Please explain me how to do it, I need to take a white tablet with me ?
> ?
> ? Thanks,
> ?
> ? Mario
> ?
>
> For consistancy, yes. You might also consider these:
>
> http://www.warmcards.com/

Archived from groups: rec.photo.digital,rec.scuba.equipment (More info?)

In article <s2pRe.7307$__1.1338@trnddc07>, Gene Palmiter
<palmiter_gene@verizon.net> wrote:

€ Um....I have them and use them....but under water?

Laminated, or just carry them in a ziplock bag. But I agree with your
main suggestion - shoot in RAW and deal with color balance later.

Archived from groups: rec.photo.digital,rec.scuba.equipment (More info?)

<marmagi@gmail.com> wrote in message
news:1125516058.851900.51620@f14g2000cwb.googlegroups.com...
> Hello,
>
> Can you please tell how pratically I can do the white balance
> adjustment with the canon ixus 700 digital camera underwater?
>
> Please explain me if I better do it at the depth I will work on ? I
> will have to repeat it if I get to shallower?
>
> Please explain me how to do it, I need to take a white tablet with me ?
>
> Thanks,
>
> Mario
>

either
shoot in RAW and sort it later
use custom white balance on a white dive slate at the depth you're
taking photos - will need to re-balance as depth changes (typically every
5-10m for good viz), although beyond 25m everything is blue anyway
take WB off sand on seabed
manually adjust WB setting to get colder as you go deeper
sort it in photoshop later
use a powerful strobe to make the entire issue mute....just remember to
swap the WB back to about 5700k before using flash ;-)

RAW is your best bet as you've got a much greater scope for exposure errors,
then it's additional lighting.

check this link http://www.seafriends.org.nz/phgraph/water.htm for depths at
which colours disappear

Archived from groups: rec.photo.digital,rec.scuba.equipment (More info?)

> ? Um....I have them and use them....but under water?
>
> Laminated, or just carry them in a ziplock bag. But I agree with your
> main suggestion - shoot in RAW and deal with color balance later.

I would add that even when shooting RAW, which I always do now, I often
still use the warm cards as that often makes the workflow faster.