Example usage for java.awt.image ColorModel getNumComponents

Introduction

In this page you can find the example usage for java.awt.image ColorModel getNumComponents.

Prototype

public int getNumComponents() 

Source Link

Document

Returns the number of components, including alpha, in this ColorModel .

Usage

From source file:org.photovault.image.PhotovaultImage.java

/**
 Create a color mapping LUT based on current color channel mapping.
 @return the created LUT. If not channel mapping is specified, returns an
 identity mapping./*from   w  w  w .j av  a  2s. c o m*/
 */
private LookupTableJAI createColorMappingLUT() {
    ColorModel colorModel = this.getCorrectedImageColorModel();
    ColorSpace colorSpace = colorModel.getColorSpace();

    int[] componentSizes = colorModel.getComponentSize();
    ColorCurve valueCurve = null;
    ColorCurve[] componentCurves = new ColorCurve[componentSizes.length];
    boolean[] applyValueCurve = new boolean[componentSizes.length];
    for (int n = 0; n < componentSizes.length; n++) {
        applyValueCurve[n] = false;
    }

    if (channelMap != null) {
        valueCurve = channelMap.getChannelCurve("value");
        switch (colorSpace.getType()) {
        case ColorSpace.TYPE_GRAY:
            // Gray scale image - just apply value curve to 1st channel
            componentCurves[0] = valueCurve;
            break;
        case ColorSpace.TYPE_RGB:
            componentCurves[0] = channelMap.getChannelCurve("red");
            componentCurves[1] = channelMap.getChannelCurve("green");
            componentCurves[2] = channelMap.getChannelCurve("blue");
            applyValueCurve[0] = true;
            applyValueCurve[1] = true;
            applyValueCurve[2] = true;
            break;
        default:
            // Unsupported color format. Just return identity transform
            break;
        }
    }
    if (valueCurve == null) {
        // No color mapping found, use identity mapping
        valueCurve = new ColorCurve();
    }

    LookupTableJAI jailut = null;
    if (componentSizes[0] == 8) {
        byte[][] lut = new byte[componentSizes.length][256];
        double dx = 1.0 / 256.0;
        for (int band = 0; band < colorModel.getNumComponents(); band++) {
            for (int n = 0; n < lut[band].length; n++) {
                double x = dx * n;
                double val = x;
                if (band < componentCurves.length && componentCurves[band] != null) {
                    val = componentCurves[band].getValue(val);
                }
                if (band < applyValueCurve.length && applyValueCurve[band]) {
                    val = valueCurve.getValue(val);
                }
                val = Math.max(0.0, Math.min(val, 1.0));
                lut[band][n] = (byte) ((lut[band].length - 1) * val);
            }
        }
        jailut = new LookupTableJAI(lut);
    } else if (componentSizes[0] == 16) {
        short[][] lut = new short[componentSizes.length][0x10000];
        double dx = 1.0 / 65536.0;
        for (int band = 0; band < colorModel.getNumComponents(); band++) {
            for (int n = 0; n < lut[band].length; n++) {
                double x = dx * n;
                double val = x;
                if (band < componentCurves.length && componentCurves[band] != null) {
                    val = componentCurves[band].getValue(val);
                }
                if (band < applyValueCurve.length && applyValueCurve[band]) {
                    val = valueCurve.getValue(val);
                }
                val = Math.max(0.0, Math.min(val, 1.0));
                lut[band][n] = (short) ((lut[band].length - 1) * val);
            }
        }
        jailut = new LookupTableJAI(lut, true);
    } else {
        log.error("Unsupported data type with with = " + componentSizes[0]);
    }
    return jailut;
}

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