This function changes the colors of an image according to the pattern of a sine wave; the image will appear to have regularly spaced bars of light and/or shadow overlaid on top of it.
Declaration:
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AT_ERRCOUNT ACCUAPI IG_FX_free_directional_light(
HIGEAR hIGear,
AT_FLOAT angle,
AT_INT pointCount,
AT_FLOAT points[],
AT_INT channelCount,
AT_FLOAT amplitude[],
AT_FLOAT frequency,
AT_FLOAT phase,
AT_FLOAT attenuation
);
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Arguments:
| hIGear | Image to which to apply free directional light effect. |
| angle | Direction to apply the effect across the image. The value is specified as an angle in degrees and ranges from 0 to 360. |
| pointCount | Length of the points array. |
| points[ ] | Array of points containing relative light deviations along the period of the sine wave. Each value typically ranges from -1 to 1. The number of points is flexible and should be chosen based on the period length relative to the image size and desired resolution of the effect. |
| channelCount | Number of image channels to which to apply the effect. |
| amplitude[ ] | Controls the magnitude of color adjustment for each channel of the image. The number of elements of the array is typically set to the number of channels in the image. Each value should range from 0 to 2, although higher values are possible. 0 represents no change in the image color. Higher values represent more intense change. Color changes are clipped, so higher values result in a harder edge to the waveform. Array length must be equal to channelCount. |
| frequency | Frequency of sine wave. The value should be from 0 to 0.5. The higher the frequency, the more bars will be visible. |
| phase | Phase of sine wave. The value should be from 0 to 2*PI (approximately 6.28). As the phase is changed, the alignment of the bars is changed. This can be used to line up the bars with image content or boundaries. |
| attenuation | Attenuation of sine wave. The value should be from -0.01 to 0.01. Attenuation adjusts how much the amplitude of the sine wave is decreased or increased as the sine wave proceeds. It can be used to cause the lighting to fade or intensify. |
Return Value:
Returns the number of ImageGear errors that occurred during this function call.
Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional, except:
Indexed RGB - 1 bpp;
Indexed RGB with non-grayscale palette.
Sample:
Image Processing