Java Code Examples for java.awt.image.ColorModel#hasAlpha()

The following examples show how to use java.awt.image.ColorModel#hasAlpha() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: JFIFMarkerSegment.java From jdk8u-jdk with GNU General Public License v2.0

6 votes

JFIFExtensionMarkerSegment(BufferedImage thumbnail)
    throws IllegalThumbException {

    super(JPEG.APP0);
    ColorModel cm = thumbnail.getColorModel();
    int csType = cm.getColorSpace().getType();
    if (cm.hasAlpha()) {
        throw new IllegalThumbException();
    }
    if (cm instanceof IndexColorModel) {
        code = THUMB_PALETTE;
        thumb = new JFIFThumbPalette(thumbnail);
    } else if (csType == ColorSpace.TYPE_RGB) {
        code = THUMB_RGB;
        thumb = new JFIFThumbRGB(thumbnail);
    } else if (csType == ColorSpace.TYPE_GRAY) {
        code = THUMB_JPEG;
        thumb = new JFIFThumbJPEG(thumbnail);
    } else {
        throw new IllegalThumbException();
    }
}

Example 2

Source File: JFIFMarkerSegment.java From jdk8u-dev-jdk with GNU General Public License v2.0

6 votes

JFIFExtensionMarkerSegment(BufferedImage thumbnail)
    throws IllegalThumbException {

    super(JPEG.APP0);
    ColorModel cm = thumbnail.getColorModel();
    int csType = cm.getColorSpace().getType();
    if (cm.hasAlpha()) {
        throw new IllegalThumbException();
    }
    if (cm instanceof IndexColorModel) {
        code = THUMB_PALETTE;
        thumb = new JFIFThumbPalette(thumbnail);
    } else if (csType == ColorSpace.TYPE_RGB) {
        code = THUMB_RGB;
        thumb = new JFIFThumbRGB(thumbnail);
    } else if (csType == ColorSpace.TYPE_GRAY) {
        code = THUMB_JPEG;
        thumb = new JFIFThumbJPEG(thumbnail);
    } else {
        throw new IllegalThumbException();
    }
}

Example 3

Source File: JPEG.java From jdk8u_jdk with GNU General Public License v2.0

5 votes

/**
 * Returns <code>true</code> if the given imageType can be used
 * in a JFIF file.  If <code>input</code> is true, then the
 * image type is considered before colorspace conversion.
 */
static boolean isJFIFcompliant(ImageTypeSpecifier imageType,
                               boolean input) {
    ColorModel cm = imageType.getColorModel();
    // Can't have alpha
    if (cm.hasAlpha()) {
        return false;
    }
    // Gray is OK, always
    int numComponents = imageType.getNumComponents();
    if (numComponents == 1) {
        return true;
    }

    // If it isn't gray, it must have 3 channels
    if (numComponents != 3) {
        return false;
    }

    if (input) {
        // Must be RGB
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_RGB) {
            return true;
        }
    } else {
        // Must be YCbCr
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_YCbCr) {
            return true;
        }
    }

    return false;
}

Example 4

Source File: JPEG.java From JDKSourceCode1.8 with MIT License

5 votes

/**
 * Returns <code>true</code> if the given imageType can be used
 * in a JFIF file.  If <code>input</code> is true, then the
 * image type is considered before colorspace conversion.
 */
static boolean isJFIFcompliant(ImageTypeSpecifier imageType,
                               boolean input) {
    ColorModel cm = imageType.getColorModel();
    // Can't have alpha
    if (cm.hasAlpha()) {
        return false;
    }
    // Gray is OK, always
    int numComponents = imageType.getNumComponents();
    if (numComponents == 1) {
        return true;
    }

    // If it isn't gray, it must have 3 channels
    if (numComponents != 3) {
        return false;
    }

    if (input) {
        // Must be RGB
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_RGB) {
            return true;
        }
    } else {
        // Must be YCbCr
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_YCbCr) {
            return true;
        }
    }

    return false;
}

Example 5

Source File: JPEGImageWriter.java From jdk8u-jdk with GNU General Public License v2.0

5 votes

private int getDefaultDestCSType(ColorModel cm) {
    int retval = JPEG.JCS_UNKNOWN;
    if (cm != null) {
        boolean alpha = cm.hasAlpha();
        ColorSpace cs = cm.getColorSpace();
        switch (cs.getType()) {
        case ColorSpace.TYPE_GRAY:
            retval = JPEG.JCS_GRAYSCALE;
            break;
        case ColorSpace.TYPE_RGB:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_YCbCr:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_3CLR:
            if (cs == JPEG.JCS.getYCC()) {
                if (alpha) {
                    retval = JPEG.JCS_YCCA;
                } else {
                    retval = JPEG.JCS_YCC;
                }
            }
        case ColorSpace.TYPE_CMYK:
            retval = JPEG.JCS_YCCK;
            break;
        }
    }
    return retval;
}

Example 6

Source File: JPEG.java From jdk8u-dev-jdk with GNU General Public License v2.0

5 votes

/**
 * Returns <code>true</code> if the given imageType can be used
 * in a JFIF file.  If <code>input</code> is true, then the
 * image type is considered before colorspace conversion.
 */
static boolean isJFIFcompliant(ImageTypeSpecifier imageType,
                               boolean input) {
    ColorModel cm = imageType.getColorModel();
    // Can't have alpha
    if (cm.hasAlpha()) {
        return false;
    }
    // Gray is OK, always
    int numComponents = imageType.getNumComponents();
    if (numComponents == 1) {
        return true;
    }

    // If it isn't gray, it must have 3 channels
    if (numComponents != 3) {
        return false;
    }

    if (input) {
        // Must be RGB
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_RGB) {
            return true;
        }
    } else {
        // Must be YCbCr
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_YCbCr) {
            return true;
        }
    }

    return false;
}

Example 7

Source File: BlitBg.java From TencentKona-8 with GNU General Public License v2.0

5 votes

@Override
public void BlitBg(SurfaceData srcData,
                   SurfaceData dstData,
                   Composite comp,
                   Region clip,
                   int bgArgb,
                   int srcx, int srcy,
                   int dstx, int dsty,
                   int width, int height)
{
    ColorModel dstModel = dstData.getColorModel();
    boolean bgHasAlpha = (bgArgb >>> 24) != 0xff;
    if (!dstModel.hasAlpha() && bgHasAlpha) {
        dstModel = ColorModel.getRGBdefault();
    }
    WritableRaster wr =
        dstModel.createCompatibleWritableRaster(width, height);
    boolean isPremult = dstModel.isAlphaPremultiplied();
    BufferedImage bimg =
        new BufferedImage(dstModel, wr, isPremult, null);
    SurfaceData tmpData = BufImgSurfaceData.createData(bimg);
    Color bgColor = new Color(bgArgb, bgHasAlpha);
    SunGraphics2D sg2d = new SunGraphics2D(tmpData, bgColor, bgColor,
                                           defaultFont);
    FillRect fillop = FillRect.locate(SurfaceType.AnyColor,
                                      CompositeType.SrcNoEa,
                                      tmpData.getSurfaceType());
    Blit combineop = Blit.getFromCache(srcData.getSurfaceType(),
                                       CompositeType.SrcOverNoEa,
                                       tmpData.getSurfaceType());
    Blit blitop = Blit.getFromCache(tmpData.getSurfaceType(), compositeType,
                                    dstData.getSurfaceType());
    fillop.FillRect(sg2d, tmpData, 0, 0, width, height);
    combineop.Blit(srcData, tmpData, AlphaComposite.SrcOver, null,
                   srcx, srcy, 0, 0, width, height);
    blitop.Blit(tmpData, dstData, comp, clip,
                0, 0, dstx, dsty, width, height);
}

Example 8

Source File: BlitBg.java From openjdk-8-source with GNU General Public License v2.0

5 votes

@Override
public void BlitBg(SurfaceData srcData,
                   SurfaceData dstData,
                   Composite comp,
                   Region clip,
                   int bgArgb,
                   int srcx, int srcy,
                   int dstx, int dsty,
                   int width, int height)
{
    ColorModel dstModel = dstData.getColorModel();
    boolean bgHasAlpha = (bgArgb >>> 24) != 0xff;
    if (!dstModel.hasAlpha() && bgHasAlpha) {
        dstModel = ColorModel.getRGBdefault();
    }
    WritableRaster wr =
        dstModel.createCompatibleWritableRaster(width, height);
    boolean isPremult = dstModel.isAlphaPremultiplied();
    BufferedImage bimg =
        new BufferedImage(dstModel, wr, isPremult, null);
    SurfaceData tmpData = BufImgSurfaceData.createData(bimg);
    Color bgColor = new Color(bgArgb, bgHasAlpha);
    SunGraphics2D sg2d = new SunGraphics2D(tmpData, bgColor, bgColor,
                                           defaultFont);
    FillRect fillop = FillRect.locate(SurfaceType.AnyColor,
                                      CompositeType.SrcNoEa,
                                      tmpData.getSurfaceType());
    Blit combineop = Blit.getFromCache(srcData.getSurfaceType(),
                                       CompositeType.SrcOverNoEa,
                                       tmpData.getSurfaceType());
    Blit blitop = Blit.getFromCache(tmpData.getSurfaceType(), compositeType,
                                    dstData.getSurfaceType());
    fillop.FillRect(sg2d, tmpData, 0, 0, width, height);
    combineop.Blit(srcData, tmpData, AlphaComposite.SrcOver, null,
                   srcx, srcy, 0, 0, width, height);
    blitop.Blit(tmpData, dstData, comp, clip,
                0, 0, dstx, dsty, width, height);
}

Example 9

Source File: JPEGImageWriter.java From openjdk-jdk8u with GNU General Public License v2.0

5 votes

private int getDefaultDestCSType(ColorModel cm) {
    int retval = JPEG.JCS_UNKNOWN;
    if (cm != null) {
        boolean alpha = cm.hasAlpha();
        ColorSpace cs = cm.getColorSpace();
        switch (cs.getType()) {
        case ColorSpace.TYPE_GRAY:
            retval = JPEG.JCS_GRAYSCALE;
            break;
        case ColorSpace.TYPE_RGB:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_YCbCr:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_3CLR:
            if (cs == JPEG.JCS.getYCC()) {
                if (alpha) {
                    retval = JPEG.JCS_YCCA;
                } else {
                    retval = JPEG.JCS_YCC;
                }
            }
        case ColorSpace.TYPE_CMYK:
            retval = JPEG.JCS_YCCK;
            break;
        }
    }
    return retval;
}

Example 10

Source File: JPEGImageWriter.java From jdk8u60 with GNU General Public License v2.0

5 votes

private int getDefaultDestCSType(ColorModel cm) {
    int retval = JPEG.JCS_UNKNOWN;
    if (cm != null) {
        boolean alpha = cm.hasAlpha();
        ColorSpace cs = cm.getColorSpace();
        switch (cs.getType()) {
        case ColorSpace.TYPE_GRAY:
            retval = JPEG.JCS_GRAYSCALE;
            break;
        case ColorSpace.TYPE_RGB:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_YCbCr:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_3CLR:
            if (cs == JPEG.JCS.getYCC()) {
                if (alpha) {
                    retval = JPEG.JCS_YCCA;
                } else {
                    retval = JPEG.JCS_YCC;
                }
            }
        case ColorSpace.TYPE_CMYK:
            retval = JPEG.JCS_YCCK;
            break;
        }
    }
    return retval;
}

Example 11

Source File: JPEGImageWriter.java From openjdk-jdk8u-backup with GNU General Public License v2.0

5 votes

private int getSrcCSType(ColorModel cm) {
    int retval = JPEG.JCS_UNKNOWN;
    if (cm != null) {
        boolean alpha = cm.hasAlpha();
        ColorSpace cs = cm.getColorSpace();
        switch (cs.getType()) {
        case ColorSpace.TYPE_GRAY:
            retval = JPEG.JCS_GRAYSCALE;
            break;
        case ColorSpace.TYPE_RGB:
            if (alpha) {
                retval = JPEG.JCS_RGBA;
            } else {
                retval = JPEG.JCS_RGB;
            }
            break;
        case ColorSpace.TYPE_YCbCr:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_3CLR:
            if (cs == JPEG.JCS.getYCC()) {
                if (alpha) {
                    retval = JPEG.JCS_YCCA;
                } else {
                    retval = JPEG.JCS_YCC;
                }
            }
        case ColorSpace.TYPE_CMYK:
            retval = JPEG.JCS_CMYK;
            break;
        }
    }
    return retval;
}

Example 12

Source File: JPEGImageWriter.java From openjdk-8 with GNU General Public License v2.0

5 votes

private int getSrcCSType(ColorModel cm) {
    int retval = JPEG.JCS_UNKNOWN;
    if (cm != null) {
        boolean alpha = cm.hasAlpha();
        ColorSpace cs = cm.getColorSpace();
        switch (cs.getType()) {
        case ColorSpace.TYPE_GRAY:
            retval = JPEG.JCS_GRAYSCALE;
            break;
        case ColorSpace.TYPE_RGB:
            if (alpha) {
                retval = JPEG.JCS_RGBA;
            } else {
                retval = JPEG.JCS_RGB;
            }
            break;
        case ColorSpace.TYPE_YCbCr:
            if (alpha) {
                retval = JPEG.JCS_YCbCrA;
            } else {
                retval = JPEG.JCS_YCbCr;
            }
            break;
        case ColorSpace.TYPE_3CLR:
            if (cs == JPEG.JCS.getYCC()) {
                if (alpha) {
                    retval = JPEG.JCS_YCCA;
                } else {
                    retval = JPEG.JCS_YCC;
                }
            }
        case ColorSpace.TYPE_CMYK:
            retval = JPEG.JCS_CMYK;
            break;
        }
    }
    return retval;
}

Example 13

Source File: JPEG.java From openjdk-8-source with GNU General Public License v2.0

5 votes

/**
 * Returns <code>true</code> if the given imageType can be used
 * in a JFIF file.  If <code>input</code> is true, then the
 * image type is considered before colorspace conversion.
 */
static boolean isJFIFcompliant(ImageTypeSpecifier imageType,
                               boolean input) {
    ColorModel cm = imageType.getColorModel();
    // Can't have alpha
    if (cm.hasAlpha()) {
        return false;
    }
    // Gray is OK, always
    int numComponents = imageType.getNumComponents();
    if (numComponents == 1) {
        return true;
    }

    // If it isn't gray, it must have 3 channels
    if (numComponents != 3) {
        return false;
    }

    if (input) {
        // Must be RGB
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_RGB) {
            return true;
        }
    } else {
        // Must be YCbCr
        if (cm.getColorSpace().getType() == ColorSpace.TYPE_YCbCr) {
            return true;
        }
    }

    return false;
}

Example 14

Source File: JPEGImageWriter.java From openjdk-jdk8u-backup with GNU General Public License v2.0

5 votes

private int getDestCSType(ImageTypeSpecifier destType) {
ColorModel cm = destType.getColorModel();
boolean alpha = cm.hasAlpha();
ColorSpace cs = cm.getColorSpace();
int retval = JPEG.JCS_UNKNOWN;
switch (cs.getType()) {
case ColorSpace.TYPE_GRAY:
        retval = JPEG.JCS_GRAYSCALE;
        break;
    case ColorSpace.TYPE_RGB:
        if (alpha) {
            retval = JPEG.JCS_RGBA;
        } else {
            retval = JPEG.JCS_RGB;
        }
        break;
    case ColorSpace.TYPE_YCbCr:
        if (alpha) {
            retval = JPEG.JCS_YCbCrA;
        } else {
            retval = JPEG.JCS_YCbCr;
        }
        break;
    case ColorSpace.TYPE_3CLR:
        if (cs == JPEG.JCS.getYCC()) {
            if (alpha) {
                retval = JPEG.JCS_YCCA;
            } else {
                retval = JPEG.JCS_YCC;
            }
        }
    case ColorSpace.TYPE_CMYK:
        retval = JPEG.JCS_CMYK;
        break;
    }
return retval;
}

Example 15

Source File: ColorYCbCrComposite.java From TrakEM2 with GNU General Public License v3.0

5 votes

public CompositeContext createContext( ColorModel srcColorModel, ColorModel dstColorModel, RenderingHints hints )
{
	final Composer c;
	if ( srcColorModel.getNumColorComponents() > 1 )
	{
		if ( srcColorModel.hasAlpha() )
			c = new ARGB2ARGB();
		else
			c = new RGB2ARGB();
	}
	else
		c = new Gray2ARGB();
	
	return new CompositeContext()
	{
		private Composer composer = c;
		public void compose( Raster src, Raster dstIn, WritableRaster dstOut )
		{
			final int[] srcPixel = new int[ 4 ];
			final int[] dstInPixel = new int[ 4 ];
			
			for ( int x = 0; x < dstOut.getWidth(); x++ )
			{
				for ( int y = 0; y < dstOut.getHeight(); y++ )
				{
					src.getPixel( x, y, srcPixel );
					dstIn.getPixel( x, y, dstInPixel );
					
					composer.compose( srcPixel, dstInPixel, alpha );
					
					dstOut.setPixel( x, y, dstInPixel );
				}
			}
		}

		public void dispose()
		{}
	};
}

Example 16

Source File: ImageType.java From scipio-erp with Apache License 2.0

5 votes

/**
 * Resolves the image type info to use for the given color model.
 * May return null.
 */
public ImageTypeInfo getImageTypeInfoFor(Integer targetPixelType, ColorModel colorModel) {
    Integer resultPixelType = null;
    ColorModel resultColorModel = null; // TODO: DEV NOTE: this must NOT be the colorModel parameter!!!

    if (targetPixelType != null) resultPixelType = typeMappings.get(targetPixelType);
    if (resultPixelType == null && (colorModel != null && !colorModel.hasAlpha())) resultPixelType = getPixelTypeNoAlpha();
    if (resultPixelType == null) resultPixelType = getPixelTypeDefault();

    return new ImageTypeInfo(resultPixelType, resultColorModel);
}

Example 17

Source File: PNGImageWriterSpi.java From dragonwell8_jdk with GNU General Public License v2.0

4 votes

public boolean canEncodeImage(ImageTypeSpecifier type) {
    SampleModel sampleModel = type.getSampleModel();
    ColorModel colorModel = type.getColorModel();

    // Find the maximum bit depth across all channels
    int[] sampleSize = sampleModel.getSampleSize();
    int bitDepth = sampleSize[0];
    for (int i = 1; i < sampleSize.length; i++) {
        if (sampleSize[i] > bitDepth) {
            bitDepth = sampleSize[i];
        }
    }

    // Ensure bitDepth is between 1 and 16
    if (bitDepth < 1 || bitDepth > 16) {
        return false;
    }

    // Check number of bands, alpha
    int numBands = sampleModel.getNumBands();
    if (numBands < 1 || numBands > 4) {
        return false;
    }

    boolean hasAlpha = colorModel.hasAlpha();
    // Fix 4464413: PNGTransparency reg-test was failing
    // because for IndexColorModels that have alpha,
    // numBands == 1 && hasAlpha == true, thus causing
    // the check below to fail and return false.
    if (colorModel instanceof IndexColorModel) {
        return true;
    }
    if ((numBands == 1 || numBands == 3) && hasAlpha) {
        return false;
    }
    if ((numBands == 2 || numBands == 4) && !hasAlpha) {
        return false;
    }

    return true;
}

Example 18

Source File: PNGImageWriterSpi.java From Bytecoder with Apache License 2.0

4 votes

public boolean canEncodeImage(ImageTypeSpecifier type) {
    SampleModel sampleModel = type.getSampleModel();
    ColorModel colorModel = type.getColorModel();

    // Find the maximum bit depth across all channels
    int[] sampleSize = sampleModel.getSampleSize();
    int bitDepth = sampleSize[0];
    for (int i = 1; i < sampleSize.length; i++) {
        if (sampleSize[i] > bitDepth) {
            bitDepth = sampleSize[i];
        }
    }

    // Ensure bitDepth is between 1 and 16
    if (bitDepth < 1 || bitDepth > 16) {
        return false;
    }

    // Check number of bands, alpha
    int numBands = sampleModel.getNumBands();
    if (numBands < 1 || numBands > 4) {
        return false;
    }

    boolean hasAlpha = colorModel.hasAlpha();
    // Fix 4464413: PNGTransparency reg-test was failing
    // because for IndexColorModels that have alpha,
    // numBands == 1 && hasAlpha == true, thus causing
    // the check below to fail and return false.
    if (colorModel instanceof IndexColorModel) {
        return true;
    }
    if ((numBands == 1 || numBands == 3) && hasAlpha) {
        return false;
    }
    if ((numBands == 2 || numBands == 4) && !hasAlpha) {
        return false;
    }

    return true;
}

Example 19

Source File: PNGImageWriterSpi.java From jdk1.8-source-analysis with Apache License 2.0

4 votes

public boolean canEncodeImage(ImageTypeSpecifier type) {
    SampleModel sampleModel = type.getSampleModel();
    ColorModel colorModel = type.getColorModel();

    // Find the maximum bit depth across all channels
    int[] sampleSize = sampleModel.getSampleSize();
    int bitDepth = sampleSize[0];
    for (int i = 1; i < sampleSize.length; i++) {
        if (sampleSize[i] > bitDepth) {
            bitDepth = sampleSize[i];
        }
    }

    // Ensure bitDepth is between 1 and 16
    if (bitDepth < 1 || bitDepth > 16) {
        return false;
    }

    // Check number of bands, alpha
    int numBands = sampleModel.getNumBands();
    if (numBands < 1 || numBands > 4) {
        return false;
    }

    boolean hasAlpha = colorModel.hasAlpha();
    // Fix 4464413: PNGTransparency reg-test was failing
    // because for IndexColorModels that have alpha,
    // numBands == 1 && hasAlpha == true, thus causing
    // the check below to fail and return false.
    if (colorModel instanceof IndexColorModel) {
        return true;
    }
    if ((numBands == 1 || numBands == 3) && hasAlpha) {
        return false;
    }
    if ((numBands == 2 || numBands == 4) && !hasAlpha) {
        return false;
    }

    return true;
}

Example 20

Source File: PNGImageWriterSpi.java From openjdk-8 with GNU General Public License v2.0

4 votes

public boolean canEncodeImage(ImageTypeSpecifier type) {
    SampleModel sampleModel = type.getSampleModel();
    ColorModel colorModel = type.getColorModel();

    // Find the maximum bit depth across all channels
    int[] sampleSize = sampleModel.getSampleSize();
    int bitDepth = sampleSize[0];
    for (int i = 1; i < sampleSize.length; i++) {
        if (sampleSize[i] > bitDepth) {
            bitDepth = sampleSize[i];
        }
    }

    // Ensure bitDepth is between 1 and 16
    if (bitDepth < 1 || bitDepth > 16) {
        return false;
    }

    // Check number of bands, alpha
    int numBands = sampleModel.getNumBands();
    if (numBands < 1 || numBands > 4) {
        return false;
    }

    boolean hasAlpha = colorModel.hasAlpha();
    // Fix 4464413: PNGTransparency reg-test was failing
    // because for IndexColorModels that have alpha,
    // numBands == 1 && hasAlpha == true, thus causing
    // the check below to fail and return false.
    if (colorModel instanceof IndexColorModel) {
        return true;
    }
    if ((numBands == 1 || numBands == 3) && hasAlpha) {
        return false;
    }
    if ((numBands == 2 || numBands == 4) && !hasAlpha) {
        return false;
    }

    return true;
}