How to get bluish background effect

[Shadow]

I saw couple of photos on Amano book "Nature Aquarium World" with bluish effect at background. It was light blue at bottom and gradually become white at top. How to get such effect?

[valice]

That's what we call high-key photography.

Two ways to achieve that. One cheap and one expensive.

Cheap: Buy graduated blue paper and still behind.
Expensive: Buy a studio strobe light and blast from the back of the tank when shooting the tank.

[Shadow]

I never see graduated blue paper before, maybe need to make one print on paper and stick it at the back

Is strobe light some kind of camera flash that keep on an off very fast? If so, do you need to match your shutter speed with the strobe light speed? So how is the setting work? When taking the picture, does the Aquarium light still on?

Sorry I have zero knowledge on photography. Googling "high-key photography" now

[ranmasatome]

google a strobe flash as well

[valice]

Strobe flashes are those flashes used by studio photographers. If you have the ADA catalog, you can see how Amano shoots the tank in one of the page.

[brianclaw]

Another cheap way to get it is to place a strip of light behind the tank and to shoot it against a white wall. There has a to be some distance(6" - 12") between the wall and the light.

[Shadow]

When you said strip of light can I use FL/PL light or need to be special light? Does the light wattage play a role? When I do this, do I need to turn off the Aquarium light (the one on top for the plant)? I mean the light sourcee now solely from strip of light behind tank.