Examples of java.awt.color.ColorSpace

java.awt.color.ColorSpace

3.org/pub/WWW/Graphics/Color/sRGB.html"> http://www.w3.org/pub/WWW/Graphics/Color/sRGB.html .

The purpose of the methods to transform to/from the well-defined CIEXYZ color space is to support conversions between any two color spaces at a reasonably high degree of accuracy. It is expected that particular implementations of subclasses of ColorSpace (e.g. ICC_ColorSpace) will support high performance conversion based on underlying platform color management systems.

The CS_CIEXYZ space used by the toCIEXYZ/fromCIEXYZ methods can be described as follows:

       CIEXYZ       viewing illuminance: 200 lux       viewing white point: CIE D50       media white point: "that of a perfectly reflecting diffuser" -- D50        media black point: 0 lux or 0 Reflectance       flare: 1 percent       surround: 20percent of the media white point       media description: reflection print (i.e., RLAB, Hunt viewing media)       note: For developers creating an ICC profile for this conversion             space, the following is applicable.  Use a simple Von Kries             white point adaptation folded into the 3X3 matrix parameters             and fold the flare and surround effects into the three             one-dimensional lookup tables (assuming one uses the minimal             model for monitors).

@see ICC_ColorSpace @version 10 Feb 1997


    // CMYK jpegs are not supported by JAI, so that we have to do the conversion on our own
    private BufferedImage convertCMYK2RGB(Raster raster, PDColorSpace colorspace) throws IOException 
    {
        // create a java color space to be used for conversion
        ColorSpace cs = colorspace.getJavaColorSpace();
        int width = raster.getWidth();
        int height = raster.getHeight();
        byte[] rgb = new byte[width * height * 3]; 
        int rgbIndex = 0;
        for (int i = 0; i < height; i++) 
        {
            for (int j = 0; j < width; j++)
            {
                // get the source color values
                float[] srcColorValues = raster.getPixel(j,i, (float[])null);
                // convert values from 0..255 to 0..1
                for (int k = 0; k < 4; k++)
                {
                    srcColorValues[k] /= 255f; 
                }
                // convert CMYK to RGB
                float[] rgbValues = cs.toRGB(srcColorValues);
                // convert values from 0..1 to 0..255
                for (int k = 0; k < 3; k++)
                {
                    rgb[rgbIndex+k] = (byte)(rgbValues[k] * 255); 
                }

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     * {@inheritDoc}
     * 
     */
    public float[] toRGB(float[] colorvalue)
    {
        ColorSpace colorspaceXYZ = ColorSpace.getInstance(CS_CIEXYZ);
        return colorspaceXYZ.toRGB(toCIEXYZ(colorvalue));
    }

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     * {@inheritDoc}
     * 
     */
    public float[] fromRGB(float[] rgbvalue)
    {
        ColorSpace colorspaceXYZ = ColorSpace.getInstance(CS_CIEXYZ);
        return fromCIEXYZ(colorspaceXYZ.fromRGB(rgbvalue));
    }

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            ColorScaler scaler = new ColorScaler();
            scaler.loadScalingData(src, null);
            float tmpData[][] = scaler.scaleNormalize(src);
            
            // Get source and destination color spaces
            ColorSpace srcCS = (srcPf == null) ? 
                    (ColorSpace) first:
                    new ICC_ColorSpace(srcPf);
            ColorSpace dstCS = (dstPf == null) ? 
                    (ColorSpace) last:
                    new ICC_ColorSpace(dstPf);
                    
            applySequence(sequence, tmpData, srcCS, dstCS);

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            throw new IllegalArgumentException("Destination color space is undefined");
        }
        
        // Get destination color space
        Object destination = conversionSequence[nSpaces-1];
        ColorSpace dstCS = 
            (destination instanceof ColorSpace) ? 
                    (ColorSpace) destination : 
                    new ICC_ColorSpace((ICC_Profile) destination);
        
        ColorModel srcCM = src.getColorModel();

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        ColorModel srcCM = src.getColorModel();
        // First handle index color model
        if (srcCM instanceof IndexColorModel) {            
            src = ((IndexColorModel) srcCM).convertToIntDiscrete(src.getRaster(), false);
        }
        ColorSpace srcCS = srcCM.getColorSpace();        
                
        BufferedImage res;
        boolean isDstIndex = false;
        if (dst != null) {
          
          if (src.getWidth() != dst.getWidth() ||
             src.getHeight() != dst.getHeight()) {
              throw new IllegalArgumentException(
                  "Incompatible images - width or height differs");
          }


            if (dst.getColorModel() instanceof IndexColorModel) {
                isDstIndex = true;
                res = createCompatibleDestImage(src, null);
            } else {                
                res = dst;
            }           
        } else {
            res = createCompatibleDestImage(src, null);
        }
        ColorModel dstCM = res.getColorModel();
        ColorSpace dstCS = dstCM.getColorSpace();
        
        ICC_Profile srcPf = null, dstPf = null;
        if (srcCS instanceof ICC_ColorSpace) {
            srcPf = ((ICC_ColorSpace)srcCS).getProfile();
        }

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            Object sequence[], 
            float tmpData[][],
            ColorSpace srcCS, 
            ColorSpace dstCS
            ) {
        ColorSpace xyzCS = ColorSpace.getInstance(ColorSpace.CS_CIEXYZ);
        
        int numPixels = tmpData.length;
        
        // First transform...
        if (sequence[0] instanceof ICC_Transform) { // ICC
            ICC_Transform t = (ICC_Transform)sequence[0];
            cc.translateColor(t, tmpData, srcCS, xyzCS, numPixels);
        } else { // non ICC
            for (int k=0; k<numPixels; k++) {
                tmpData[k] = srcCS.toCIEXYZ(tmpData[k]); 
            }
            cc.loadScalingData(xyzCS); // prepare for scaling XYZ
        }
        
        for (Object element : sequence) {
            if (element instanceof ICC_Transform) {
                ICC_Transform t = (ICC_Transform)element;
                cc.translateColor(t, tmpData, null, null, numPixels);
            } else {
                ColorSpace cs = (ColorSpace) element;
                for (int k=0; k<numPixels; k++) {
                    tmpData[k] = cs.fromCIEXYZ(tmpData[k]);
                    tmpData[k] = cs.toCIEXYZ(tmpData[k]); 
                }
            }
        }
        
        // Last transform...

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                    maxComponents = 
                        (maxComponents > t.getNumOutputChannels() + 1) ?
                            maxComponents : 
                            t.getNumOutputChannels() + 1;
                } else {
                    ColorSpace cs = (ColorSpace) o;
                    maxComponents = 
                        (maxComponents > cs.getNumComponents() + 1) ?
                            maxComponents : 
                            cs.getNumComponents() + 1;
                }               
            }
            
            return sequence.toArray();
        }

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                        // and strokes e.g. sun.awt.windows.WPrinterJob.setTextColor
                        return new Color(components[0], components[0], components[0]);
                    }
                }
                Color override = iccOverrideColor;
                ColorSpace cs = colorSpace.getJavaColorSpace();
                if (cs instanceof ICC_ColorSpace && override != null)
                {
                    LOG.warn("Using an ICC override color to avoid a potential" + " JVM crash (see PDFBOX-511)");
                    return override;
                }

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              src.getTileGridYOffset(),
              null);


        ColorModel srcCM = src.getColorModel();
        if (srcCM == null) return;
        ColorSpace srcCS = srcCM.getColorSpace();
        if (srcCS == ColorSpace.getInstance(ColorSpace.CS_LINEAR_RGB))
            srcIsLsRGB = true;
    }

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