Graphics Programs Reference
In-Depth Information
Gamma correct
Gamma correct accentuates the Bokeh shape by brightening the out-of-focus areas
of the image.
FStop
FStop is a very important parameter that gives control over the focal blur amount.
FStop simulates the aperture in a real lens, preserving the luminosity of the image.
Similar to a real camera, the smaller the FStop number, the higher the lens iris open-
ing time, and the shallower the Depth of Field. At a default value of 128, everything
is in perfect focus, which is assumed as infinity. Half of this value will double the blur
amount. This button is available only when enabling
Use Z Buffer
.
Maxblur
Maxblur limits the blur amount of the most out-of-focus regions of the image. Since
the Defocus node gets slower to process as the blur amount increases, this value
helps limit the maximum blur radius allowed. With a default value of zero, there will
not be any limit to the maximum blur amount.
Threshold
When an object that is in-focus overlaps a very far defocused background, aliased
edges can be observed. The number of artifacts increases with the increase in dis-
tance between the overlapped objects. This value can be used to set how large that
blur difference can be, to consider it safe and thereby prevent the occurrence of
aliased edges.
Preview
The Preview mode calculates the result a lot faster compared to the Normal mode,
using a limited number of (quasi) random samples. This mode also introduces grain,
which is the noise in the image (though the noise reduces with more samples). This
option should be disabled before rendering.
