Example 1: Exposure control: f-number (f-stop)

Example 2: Exposure control: shutter speed (s^-1)

Example 3: Exposure control: film speen (ISO)

Example 4: Zoom factor

Example 5: Distortion

Example 6: Vignetting

Example 7: White balance

Example 8: Depth of Field (DOF)

Example 9: Motion Blur (MB)

 


Search Keywords: camera, physical camera, exposure, f-stop, shutter speed, iso, vignetting, dof, motion blur, sun , sky

 

 

Note: the Sponza Atrium model is created by Marko Dabrovic (http://www.rna.hr) and is one of the models for the CGTechniques Radiosity competition.

Note: All the images are rendered using the VRaySun and VRaySky set with their default parameters.

 

 

Example 1: Exposure control: F-Stop (f-number)

Exposure clolor correction: on, Shutter Speed : 150.0, ISO: 100, Enable vignetting effect: on, White balance: white

 

F-Stop: 8
F-Stop: 6
F-Stop: 4

 

Lowerring the F-Stop value will actually make the image brighter. Thus, the camera aperture is being opened, so more light is absorbed.

In reverse, increasing the F-Stop will make the image darker, as the aperture is being closed. This parameter also determines the amount of the DOF effect, see example 8.

 

Example 2: Exposure control: shutter speed (s^-1)

Exposure color correction: on, f-number: 8.0, ISO: 200, Enable vignetting effect: on, White balance: white

 

shutter speed: 200
shutter speed: 100
shutter speed: 400

 

This parameter determines the "exposure time". The longer this time is (small shutter speed value) - the brighter the image would be.

In reverese - if the shutter speed is shorter, the image would get darker (high shutter speed value).

This parameter also affects the Motion blur effect, see example 9.

 

Example 3: Exposure control: film speed (ISO)

Exposure color correction: on, Shutter Speed (s^-1): 400.0, f-number: 8.0, Enable vignetting effect: on, White balance: white

 

ISO: 400
ISO: 800
ISO: 1600

 

This parameter determines the sensitivity (brightness) of the image. If the film speed (ISO) is high (more sensitive to the light), the less light is needed to get the image. Higher values are usually used for "night shot" images.

 

Example 4: Zoom factor

Exposure: on, f-number: 8.0, Shutter Speed (s^-1): 60.0, ISO: 200.0, Vignetting: on, White balance: white

 

Zoom factor: 1.0
Zoom factor: 2.0
Zoom factor: 0.5

 

This parameter determines the zooming (In and Out) of the final image. It doesn't move the camera forward neither backwards.

Example 5: Distortion

 

Distortion: 1.0
Distortion: -1.0

 

Example 6: Vignetting

 

Vignetting: Off
Vignetting: On

 

Simulating the optical vignetting effect of real-world cameras.

 

Example 7: White balance

Exposure: on, f-number: 8.0, Shutter Speed (s^-1): 200.0, ISO: 200.0, Vignetting: on

 

White balance - White(255,255,255)
White balance - Blue (171,244,255)
White balance - Peach (255,223,182)

 

Using the white balance color allows additional modification of the image output. Objects in the scene that have the specified color will appear white in the image. E.g. for daylight scenes this should be peach color to compensate for the color of the sun light etc.

 

Example 8: Depth Of Field (DOF)

To have the DOF effect you need to check On the Depth-of-field checkbox. Blades (Bokeh effect) is also part of the DOF effect.

The effect is strongly seen when the camera is very close to some object, just like doing a macro photo. So to have a strong DOF effect, the camera aperture has to be "open" - small F-stop value. That would lead to a very burnt/bright image, so to preserve the same illuminosity over the whole image, the shutter speed has to be quick. And at last but not at least the focus distance will determine which part of the field will be actually on focus. To get the focus near, you would need a small value and reverse - higher value for far focus.

 

 

F-Stop: 1.0, Shutter Speed (s^-1): 4000.0, ISO: 30.0, Vignetting: on

 

no DOF effect
DOF - On, focus distance: 80
DOF - on, focus distance: 140

 

Example 9: Motion Blur (MB)

To have the Motion Blur effect you need to check On the Motion-blur checkbox.

The size/amount of the motion blur is determined by the speed of the moving object itself as well as the Shutter speed of the camera. Low shutter speeds will produce more even motion blur, as the movement of the object is taken longer in time. In reverse - high Shutter speeds will produce less motion blur effect. Keep in mind that to preserve the same illuminosity over the whole image, the f-number value has to be corrected as well.

 

 

Exposure: on, ISO: 8, Vignetting: on

 

no Motion blur (MB)

MB - On, f-number: 16.0, Shutter speed 4

MB - on, f-number: 8.0, Shutter Speed 16