Photographing Glass, Metal and Liquids: Bright-Field and Dark-Field Lighting
Written by Abin Alex and Anu Joseph.
Abstract
A guide to lighting reflective and transparent products: the family of angles, bright and dark metal, tents, polarisers and black magic, bright-field and dark-field glass lighting, surface highlights and the true colour of liquids, with three tables.
Keywords: glass photography, bright field lighting, dark field lighting, black line white line, metal product photography, family of angles, bottle photography, liquid photography, reflective products
Why are shiny products lit differently?
Short answer. Metal and glass show you mostly direct reflection, so you light what they reflect, not the object.
- Polished metal produces almost nothing but direct reflection. That makes it predictable: you can tell before you start where the light must be and how big it must be (Hunter and Fuqua, 1997, p. 107).
- Glass also produces mostly direct reflection, but with glass the edges matter more than the front. If the edges are clearly defined, you can often ignore the front surface (Hunter and Fuqua, 1997, p. 143).
- Every shiny surface reflects a particular zone of the studio towards the lens, called the family of angles. A light inside that zone appears in the surface. A light outside it does not.
- So with shiny products, you are really lighting the room the product reflects. Cards, softboxes and black flags become the picture.
Place a spoon on a table and walk a softbox around it while watching through the camera. Note where the spoon turns bright.
Cinematographers dress the set behind the camera when a scene has mirrors or polished cars, because the reflections are part of the shot.
Cham tipLight what the surface sees.
Cham taskSketch the family of angles for a flat tray and a round bottle.
Check yourself: What is the family of angles?
The zone of positions from which a light will reflect directly into the lens.
How do you light metal: bright or dark?
Short answer. Decide how bright the metal should be, then put the light inside or outside the family of angles.
- The first decision is whether the metal should look bright, dark or somewhere between. That answer decides the lighting (Hunter and Fuqua, 1997, p. 109).
- For bright metal, fill the family of angles with a large light source, usually a softbox or a lit sheet of diffusion. For dark metal, put the light anywhere else (Hunter and Fuqua, 1997, p. 109).
- With the light outside the family of angles, polished metal turns black while a white surface beside it stays white, because the metal cannot produce much diffuse reflection (Hunter and Fuqua, 1997, p. 117).
- Most good metal pictures mix both: a bright face to show the material and a dark edge or band to show the shape. A black strip and a white strip are classic product setups.
- Round, shiny objects reflect almost the whole room. A tent of translucent material around the product, with the camera shooting through a small hole, cuts the unwanted reflections (Hunter and Fuqua, 1997, p. 137).
| Look | Where the light goes | Result |
|---|---|---|
| Bright | Inside the family of angles | Metal reads as polished and light |
| Dark | Outside the family of angles | Metal reads black, background stays light |
| Graded | Edge of a softbox at the limit | Smooth fall-off from light to dark |
Table 1. Bright and dark metal.
Photograph a steel spatula twice: once with the softbox inside the family of angles, once outside it.
Product films of watches and cars use giant overhead diffusion frames to keep metal bright and smooth.
Cham tipDecide bright or dark before you light.
Cham taskLight a steel watch so the dial is bright and the case edge is dark.
Check yourself: How do you make polished metal look black?
Place the light outside the family of angles so no direct reflection reaches the lens.
What finishing touches help metal?
Short answer. Polarisers, black cards and dulling spray separate metal from its background.
- When the metal reflects a surface of the same brightness as itself, its edge disappears. Polarising filters, black magic and dulling spray solve this (Hunter and Fuqua, 1997, p. 139).
- Metal does not polarise its own reflections, so a lens polariser alone usually does nothing. It works when the light was already polarised, for example sky or a glossy surface, or when you add a polarising sheet over the light (Hunter and Fuqua, 1997, p. 139).
- Black magic means adding black card or tape only so that it reflects in the metal as a dark line or band. That line shows the edge and the curve.
- Dulling spray reduces the shine where a reflection cannot be controlled. Use it sparingly, because it also hides the polish that makes metal attractive.
Place black card strips at different distances from a chrome tap and watch the dark lines move.
Gaffers place black floppies just out of frame to put a defining line on a car bonnet.
Cham tipBlack cards draw the edge.
Cham taskMake a set of black and white cards in three widths for your product kit.
Check yourself: What is black magic in product lighting?
Black card added only so it reflects in the metal as a dark line.
What is bright-field (black-line) lighting for glass?
Short answer. A bright background behind the glass, with no light at the edge angles, draws the glass in black lines.
- A good glass picture needs two things: strong lines along the edges to show the shape and separate it from the background, and no distracting reflections of the lights or equipment (Hunter and Fuqua, 1997, p. 145).
- In bright-field lighting the background is brighter than the reflections on the glass. The edges stay dark because no light comes from the limits of the family of angles (Hunter and Fuqua, 1997, p. 147).
- The simplest way is to backlight the glass: light a white or translucent background behind it and keep light off the sides.
- Because light passes through the glass, the glass acts like a filter and shows its colour, thickness and density. Black-line lighting tends to flatten the space inside the glass.
- Use black cards on either side of the glass, just out of frame, to make the black edge lines stronger.
| Method | Background | Edges | Mood |
|---|---|---|---|
| Bright-field, black line | Bright, lit from behind | Dark lines | Clean, graphic, shows colour |
| Dark-field, white line | Dark | Bright lines | Dramatic, shows volume |
Table 2. Bright-field and dark-field glass lighting.
Backlight a clear wine glass on a white sheet and add black cards at each side one at a time.
Bottle shots in commercials often start with a lit backdrop and black flags at the sides, the same bright-field set.
Cham tipLight behind, black at the sides.
Cham taskShoot one glass in bright-field and describe how its colour reads.
Check yourself: In bright-field lighting, why are the glass edges dark?
No light comes from the limits of the family of angles.
What is dark-field (white-line) lighting for glass?
Short answer. A dark background with light coming only from the edge angles draws the glass in bright lines.
- In dark-field lighting the glass edges are bright and the background is dark. To get this, light must come from the far limits of the family of angles, and the glass must see no light anywhere else (Hunter and Fuqua, 1997, p. 151).
- A classic way is a large lit panel behind the glass with a black card in the middle, smaller than the panel, so only the outer edges of the light show around the glass.
- Another way is two vertical white cards on either side and behind the glass, each lit separately so no light falls directly on the glass. The narrower and further away the cards, the thinner the white lines.
- White-line lighting is based on reflection, so it shows the volume and form of the glass better than black-line lighting.
- Do not mix the two by accident. A light tent around glass lights both background and edges, and the edges disappear. To combine them, divide the picture deliberately into a bright-field part and a dark-field part (Hunter and Fuqua, 1997, p. 155).
Put a black card behind a glass in front of a lit softbox and move it forward until bright edges appear.
Whisky commercials use dark-field rim light to make the bottle shape glow out of black.
Cham tipLight at the edges, black everywhere else.
Cham taskLight the same glass in black-line and white-line and show both side by side.
Check yourself: What does white-line lighting show better than black-line?
The volume and form of the glass, because it is based on reflection.
How do you show the surface of glass and the true colour of a liquid?
Short answer. Large highlights define the surface. A light card behind the liquid keeps its colour.
- Edges show the shape, but the surface often needs to read too. Large highlights are essential to define the surface of glassware (Hunter and Fuqua, 1997, p. 157). Place a large diffused light at an angle so one long highlight runs down the glass.
- A liquid in a clear container takes on the colour of whatever is behind it. Light beer in front of a dark background will look like dark beer (Hunter and Fuqua, 1997, p. 171).
- The cure is a small light-toned card cut to the shape of the glass and hidden behind it, lit separately so the liquid glows with its true colour. Gold foil suits beer (Hunter and Fuqua, 1997, p. 173).
- For cold drinks, condensation and frosted glass tell the viewer the drink is chilled. The food photography and styling guide explains how stylists create them.
- For splashes and pouring liquids, use a short flash duration, a fast shutter in continuous light, and many attempts. Protect the lights and camera from spray.
| Problem | Cause | Fix |
|---|---|---|
| Glass disappears | Background and edges the same brightness | Choose bright-field or dark-field |
| Lights reflect in the glass | Light inside the family of angles at the front | Move the light, add black cards |
| Liquid looks too dark | Dark background seen through it | Hidden light card behind the glass |
| Surface looks flat | No highlight | Add one large soft highlight |
Table 3. Common problems with glass and liquids.
Photograph a glass of orange juice against black, then add a hidden white card cut to the glass shape.
Drink commercials spend hours on these hidden cards because colour sells the product.
Cham tipThe background is inside the glass.
Cham taskCut backing cards for three different glasses in your studio.
Check yourself: Why does a light drink look dark against a black background?
A liquid in a clear container takes on the colour of what is behind it.
Questions beginners ask
What is the difference between bright-field and dark-field lighting?
Bright-field uses a bright background so glass edges show as dark lines. Dark-field uses a dark background with light at the edges so they show as bright lines.
How do you photograph shiny metal without reflections?
Decide whether the metal should be bright or dark, place a large soft light inside or outside the family of angles, and use black cards to control the edges.
Why does glass disappear in my photos?
The edges and background are the same brightness. Use bright-field or dark-field lighting so the edges contrast with the background.
Does a polarising filter remove reflections from metal?
Usually not, because metal does not polarise its reflections. It helps only when the light reaching the metal is already polarised.
How do photographers keep a drink's true colour?
They hide a light-toned card cut to the shape of the glass behind it and light it separately.
References
- Hunter, F. and Fuqua, P. (1997) Light: science and magic: an introduction to photographic lighting. 2nd edn. Boston: Focal Press.
Further reading
- Child, J. and Galer, M. (2008) Photographic lighting: essential skills. 4th edn. Oxford: Focal Press.
- Siskin, J. (2011) Understanding and controlling strobe lighting: a guide for digital photographers. Buffalo, NY: Amherst Media.
How to cite this guide. Alex, A., & Joseph, A. (2026). Photographing glass, metal and liquids: A guide for photographers and cinematographers. Creative Hut Academy. https://creativehut.org/library/photographing-glass-metal-and-liquids/
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