| 7.6. Ruido RGB | ||
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7. Filtros de ruido |  |
| 7.6. Ruido RGB | ||
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7. Filtros de ruido | |
Figura 17.154. Ejemplo de aplicación del filtro “Ruido RGB”
Imagen original
Filtro “Ruido RGB” aplicado
The RGB Noise filter adds a normally distributed noise to a layer or a selection. It uses the RGB color model to produce the noise (noise is added to red, green and blue values of each pixel). A normal distribution means, that only slight noise is added to the most pixels in the affected area, while less pixels are affected by more extreme values. (If you apply this filter to an image filled with a solid gray color and then look at its histogram, you will see a classic bell-shaped Gaussian curve.)
El resultado es un ruido muy natural.
![[Nota]](images/note.png)
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Nota |
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Estas opciones se describen en la Sección 2, “Características comunes”. |
Noise may be additive (uncorrelated) or multiplicative (correlated - also known as speckle noise). When checked, every channel value is multiplied by a normal distributed value. So the noise depends on the channel values: a greater channel value leads to more noise, while dark colors (small values) tend to remain dark.
When this radio button is checked, you can move each RGB slider separately. Otherwise, the sliders R, G and B will be replaced by a single slider Value. The same relative noise will then be added to all channels in each pixel, so the hue of pixels does not change much.
Funciona con datos de color RGB linealizados.
Utiliza una distribución de ruido gaussiana. Cuando no está marcado, se utiliza en su lugar una distribución de ruido lineal.
These slidebars and adjacent input boxes allow to set noise level (0.00 - 1.00) in each channel.
El valor de estos deslizadores determina la desviación estándar de la distribución normal del ruido aplicado. La desviación estándar usada es la mitad del valor elegido (donde 1 es la distancia entre el menor y mayor valor posible en el canal).
Controls randomness of noise. If the same random seed is used in the same situation, the filter produces exactly the same results. A different random seed produces different results. Random seed can be entered manually or generated randomly by pressing the button.
