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      <title>SpectrumFx Iwa</title>

   SpectrumFx Iwa

● Overview

Depending on the brightness of the input image, it has the effect of outputing a rainbow color pattern like a thin film interference.

Real iridescent glare is not a thin film interference, but you can get likely results for the glare of the material.

  
● Input port

Source : Connect the input image. The brightness of the input image, corresponds to the thickness of the thin film.

Thin film thickness is how bright the brightness will be, brightness 0.0 is the "Thickness Min" which will be described later, brightness 1.0 will correspond to the "Thickness Max".

Light : Connect the light image.

If the light image is connected, there is less of a difference in the output.

Alpha channel of output results, will be replaced in the alpha channel of the light image.

If the "Light Threshold" parameters described below are enabled, you can output the image of the light image & the rainbow colors for screen synthesis.

● Parameters

Intensity : The intensity of the light. Rainbow-color image will be brighter when it is set higher.

Refractive Index : The medium refractive index. Rainbow-color image will be brighter when it is set higher.

Thick(ness) Max : The maximum value of the thin film thickness. This corresponds to the film thickness of the brightness 0 portion of the input image.

Thick(ness) Min : The minimum value of the thin film thickness. This corresponds to the film thickness of the brightness 1 portion of the input image.

※ Thickness can also take a negative value. In that case, the film thickness is calculated as if the negative part is 0.

※ Thickness of Min, Max, can also reverse the magnitude of the value. In that case, the rainbow colors of the pattern is reversed.

R/G/B Gamma : Used as a gamma correction value for each of the RGB channels, of the rainbow color pattern.

Lens Factor : The gamma correction value that can be added to when outputting a rainbow color pattern from the input image brightness.

As a result, for example, for the concentric pattern, you can put a strain, such as through a convex/concave lens for the period of the rainbow.

Light Threshold : When the light image is connected, you can combine the screens of the light image & the rainbow color image.

Light Threshold is the minimum value of the alpha channel of the light image required for the screen synthesis.

For each pixel, it will be performed with the following processing.

When the alpha channel of the light image is following the Light Threshold ： Screen synthesis does not take place.

When the alpha channel of the light image is 1 ： Light image screen is synthesized at 100%.

When the alpha channel of the light image is larger than the Light Threshold, & less than 1 ： The proportion of the screen synthesis is linear interpolation.

The higher the value of the Light Threshold the brighter the output image will become, a smaller screen ratio makes the writen image become larger. You can also make it a negative value.