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| <h1><img src = ".\img\fx_iwa_spectrum.png" width = 30 height = 30 > SpectrumFx Iwa</h1> |
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| <h4>● Overview</h4> |
| This effect produces a rainbow pattern like that of a thin film interference, according to the brightness<br> |
| of the input image.<br> |
| Even though the rainbow colors generated are not actually a thin film interference, similar results to<br> |
| a glare material can be obtained. |
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| <h4>● Input port</h4> |
| <UL> |
| <LI><b>Source</b> : Connect the source image. The brightness of the source image, corresponds to the<br> |
| thickness of the thin film.<br> |
| The brighter the luminosity, the thinner the film thickness will be. A luminosity of 0.0 corresponds to<br> |
| "Thickness Min" described later, and a luminosity of 1.0 corresponds to "Thickness Max".</LI> |
| <LI><b>Light</b> : Connect the light image.<br> |
| When a light image is connected, the output results are as follows:</LI> |
| <UL> |
| <LI>The Alpha channel of the output result is replaced with the alpha channel of the Light image.</LI> |
| <LI>If the "Light Threshold" parameter described below is enabled, the Light image and the generated<br> |
| rainbow can be combined and output on the screen.</LI> |
| </UL> |
| </UL> |
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| <h4>● Parameters</h4> |
| <UL> |
| <LI><b>Intensity</b> : The light intensity. The higher the value, the brighter the rainbow.</LI> |
| <LI><b>Refractive Index</b> : The refractive index of the medium. The higher the value, the brighter the<br> |
| rainbow.</LI> |
| <LI><b>Thickness Max</b> : Maximum thickness of the thin film. Corresponds to the film thickness of the<br> |
| low luminance portion of the Source image.</LI> |
| <LI><b>Thickness Min</b> : Minimum thickness of the thin film. Corresponds to the film thickness of the<br> |
| high luminance part of the Source image.</LI> |
| *Thickness can also take a negative value. In that case, all parts where the film thickness is negative<br> |
| are calculated as zero.<br> |
| *Thickness Min and Max can be reversed. In that case, the iridescent pattern will be reversed. |
| <LI><b>R/G/B Gamma</b> : Gamma correction value for each RGB channel of the rainbow pattern.</LI><br> |
| <LI><b>Lens Factor</b> : A gamma correction value that can be added when outputting a rainbow pattern from<br> |
| the luminosity of the Source image.<br> |
| This allows, for example, concentric patterns to be distorted through a convex / concave lens in the<br> |
| iridescent period.</LI> |
| <LI><b>Light Threshold</b> : When a Light image is connected, the Light image can be combined with the<br> |
| rainbow pattern on the screen.<br> |
| Light Threshold is the minimum Alpha channel value of the Light image required for screen composition.<br> |
| For each pixel, the following processing will be performed:</LI> |
| <UL> |
| <LI>When the alpha channel of the Light image is below the Light Threshold: Screen composition is not<br> |
| performed.</LI> |
| <LI>When the alpha channel of the Light image is 1: The Light image is composited on the screen at 100%.</LI> |
| <LI>When the alpha channel of the Light image is greater than the Light Threshold but less than 1: The<br> |
| screen composition ratio will be linearly interpolated.</LI> |
| </UL> |
| The smaller the Light Threshold value, the larger the screen ratio with the Light image, so the output<br> |
| image will be brighter. It can also accept negative values. |
| </UL> |
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