This video clip can be played with different soundtracks. Select a track to play the movie.

How do the different soundtracks change the meaning of the video?

Drag the circles until they overlap.

The primary additive colors are red, green, and blue. When combined, as when lights are projected on a dark screen, the color white results.

Select a photograph using the buttons on the right.

Drag the sliders to adjust the brightness, contrast, saturation, and color values of the image.

The reset button returns the attributes to their neutral settings.

Press the buttons to view the clips.

Pan: camera pivots right and left.

Tilt: camera pivots up and down.

Zoom: movement of lens elements changes the focal length and resulting field of view.

Truck: camera moves right and left through space.

Pedestal: camera moves up and down through space.

Dolly: camera moves along z-axis.

Z-axis: Generic concept describing implied depth within a two-dimensional image. Zoom, dolly, and subject movement along the z-axis create depth.

Compare these images to see what happens when light sources are matched and mismatched to camera settings or film stock.

Reproducing an image with proper color balance requires matching the camera setting or film to the color temperature of the light source.

Daylight film exposed in tungsten or quarts light results in a reddish-orange image. Tungsten film exposed in daylight results in a blue image.

Select the amount of compression using the buttons on the right.

Compression uses computer algorithms to reduce file size. Generally, compression also reduces quality.

Use the slider to change the framing of the photograph.

Headroom is the space above the subject's head in the frame. Composing shots with enough headroom, like by placing the eyes on the 1/3 line, compensates for the magnetism of the frame's edge. The wider the shot, the more headroom is needed.

Use the slider to change the framing of the photograph.

Lookspace is the space between the subject's eye and the edge of frame. As the subject turns away from the camera, more lookspace is needed.

Use the slider to change the number of frames displayed per second.

Persistence of vision is a phenomenon where images are retained for a brief moment after they are seen. The effect explains why film projection appears continuous, even though the shutter covers the frame as the film is advanced.

In animation, the effect causes rapidly changing images to blend together. In this cartoon, at faster frame rates, an illusion of motion trails can be seen.

Use the slider to change the number of frames displayed per second.

Lights turned off and on in rapid succession demonstrate the psychological effect of motion perception.

At slower speeds, the colored dots appear to slide around the circle, snake-like, in a counter-clockwise direction.

At faster speeds, the phi phenomenon occurs. In this illusion, an invisible dot appears to move rapidly in the opposite direction.

Press the Play button to hear the mix. Drag the sliders to change the volume of each audio track.

How does altering the mix levels affect the audience's perception of the scene?

Drag the circles until they overlap.

The primary subtactive colors are cyan, magenta, and yellow. When combined, as when inks are mixed on white paper, the color black results.

View clips of the subject under different combinations of lights. This three point lighting setup is created with a key, fill, and back light.

Toggle the buttons to turn each light on and off.

View clips of the subject under different combinations of lights. This two point lighting setup is created with a side key and fill light.

Toggle the buttons to turn each light on and off.