C*Pix SDC2000 Instruções de Operação descarregar pdf (Página 263)

SDC 2002

4.9 Special Menu

4-177

Operating Instructions - Rev. 1 / 6.2003

8. Grain

Reduction

& Gang

The RGB sliders form a new feature for even more specific grain reduction.

The strength of grain reduction can be set here individually for each color

channel.

The range is from 0 to 15 in steps of one.

To modify, slide on the touchscreen or use the soft pot control.

The current setting is displayed as a bar graph with the corresponding values

on top. There may be need for such specific settings as film material consists

of layers containing silver halogenous grains sensitive for red, green and blue

light.

Later on they react with the corresponding dyes (yellow, cyan and magenta) to

create a colored picture.

Different layers may respond in different ways to sensibilization, exposure and

processing and therefore the impression of granularity may differ from one

layer to another.

With the SCREAM there is no need for grain filter type selection (Transversal,

Recursive, etc.).

According to the filter strength setting of the RGB channels, grain filter selec-

tion is automatically performed.

TRANSVERSAL FILTER (roughly) works according to the following method:

The output pixel is averaged (median value) from the same pixels of three

successive pictures and the vertically adjacent pixels of the center frame.

This filter works with a constant quality, no matter how far away from a scene

change event.

RECURSIVE FILTER (roughly) works according to the following method:

The averaging of the output pixel here is a process, involving pixels of all pre-

ceding pictures after the last scene change up to the current picture.

The output pixel averages the current pixel with the same, already averaged

pixel of the previous picture which itself already is the average of the previous

recursion.

That is why this filter of course works much stronger than the Transversal Fil-

ter (be careful: in some cases maybe even too aggressive for your desired

application) but with increasing effect the further you get from the last scene

change.

Gang

This button concertedly controls a group of keys. With GANG activated (green

bar on the key is lit) the strength parameter slider of grain reduction in all three

channels (RGB) is modified by touching only one of the controls.

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