javax.imageio

## Class ImageTypeSpecifier

- java.lang.Object
- - javax.imageio.ImageTypeSpecifier

-     public class ImageTypeSpecifier
      extends Object

  A class that allows the format of an image (in particular, its `SampleModel` and `ColorModel`) to be specified in a convenient manner.

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `protected ColorModel` | `colorModel` | The `ColorModel` to be used as a prototype.
    `protected SampleModel` | `sampleModel` | A `SampleModel` to be used as a prototype.

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `ImageTypeSpecifier(ColorModel colorModel, SampleModel sampleModel)` | Constructs an `ImageTypeSpecifier` directly from a `ColorModel` and a `SampleModel`.
    `ImageTypeSpecifier(RenderedImage image)` | Constructs an `ImageTypeSpecifier` from a `RenderedImage`.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `static ImageTypeSpecifier` | `createBanded(ColorSpace colorSpace, int[] bankIndices, int[] bandOffsets, int dataType, boolean hasAlpha, boolean isAlphaPremultiplied)` | Returns a specifier for a banded image format that will use a `ComponentColorModel` and a `BandedSampleModel` to store each channel in a separate array.
    `BufferedImage` | `createBufferedImage(int width, int height)` | Creates a `BufferedImage` with a given width and height according to the specification embodied in this object.
    `static ImageTypeSpecifier` | `createFromBufferedImageType(int bufferedImageType)` | Returns an `ImageTypeSpecifier` that encodes one of the standard `BufferedImage` types (other than `TYPE_CUSTOM`).
    `static ImageTypeSpecifier` | `createFromRenderedImage(RenderedImage image)` | Returns an `ImageTypeSpecifier` that encodes the layout of a `RenderedImage` (which may be a `BufferedImage`).
    `static ImageTypeSpecifier` | `createGrayscale(int bits, int dataType, boolean isSigned)` | Returns a specifier for a grayscale image format that will pack pixels of the given bit depth into array elements of the specified data type.
    `static ImageTypeSpecifier` | `createGrayscale(int bits, int dataType, boolean isSigned, boolean isAlphaPremultiplied)` | Returns a specifier for a grayscale plus alpha image format that will pack pixels of the given bit depth into array elements of the specified data type.
    `static ImageTypeSpecifier` | `createIndexed(byte[] redLUT, byte[] greenLUT, byte[] blueLUT, byte[] alphaLUT, int bits, int dataType)` | Returns a specifier for an indexed-color image format that will pack index values of the given bit depth into array elements of the specified data type.
    `static ImageTypeSpecifier` | `createInterleaved(ColorSpace colorSpace, int[] bandOffsets, int dataType, boolean hasAlpha, boolean isAlphaPremultiplied)` | Returns a specifier for an interleaved image format that will use a `ComponentColorModel` and a `PixelInterleavedSampleModel` to store each pixel component in a separate byte, short, or int.
    `static ImageTypeSpecifier` | `createPacked(ColorSpace colorSpace, int redMask, int greenMask, int blueMask, int alphaMask, int transferType, boolean isAlphaPremultiplied)` | Returns a specifier for a packed image format that will use a `DirectColorModel` and a packed `SampleModel` to store each pixel packed into in a single byte, short, or int.
    `boolean` | `equals(Object o)` | Returns `true` if the given `Object` is an `ImageTypeSpecifier` and has a `SampleModel` and `ColorModel` that are equal to those of this object.
    `int` | `getBitsPerBand(int band)` | Return the number of bits used to represent samples of the given band.
    `int` | `getBufferedImageType()` | Returns an int containing one of the enumerated constant values describing image formats from `BufferedImage`.
    `ColorModel` | `getColorModel()` | Returns the `ColorModel` specified by this object.
    `int` | `getNumBands()` | Return the number of bands specified by this object.
    `int` | `getNumComponents()` | Return the number of color components specified by this object.
    `SampleModel` | `getSampleModel()` | Returns a `SampleModel` based on the settings encapsulated within this object.
    `SampleModel` | `getSampleModel(int width, int height)` | Returns a `SampleModel` based on the settings encapsulated within this object.
    `int` | `hashCode()` | Returns the hash code for this ImageTypeSpecifier.

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### colorModel

          protected ColorModel colorModel

      The `ColorModel` to be used as a prototype.

    - #### sampleModel

          protected SampleModel sampleModel

      A `SampleModel` to be used as a prototype.

  - ### Constructor Detail

    - #### ImageTypeSpecifier

          public ImageTypeSpecifier(ColorModel colorModel,
                                    SampleModel sampleModel)

      Constructs an `ImageTypeSpecifier` directly from a `ColorModel` and a `SampleModel`. It is the caller's responsibility to supply compatible parameters.
      Parameters:
        `colorModel` - a `ColorModel`.
        `sampleModel` - a `SampleModel`.
      Throws:
        `IllegalArgumentException` - if either parameter is `null`.
        `IllegalArgumentException` - if `sampleModel` is not compatible with `colorModel`.

    - #### ImageTypeSpecifier

          public ImageTypeSpecifier(RenderedImage image)

      Constructs an `ImageTypeSpecifier` from a `RenderedImage`. If a `BufferedImage` is being used, one of the factory methods `createFromRenderedImage` or `createFromBufferedImageType` should be used instead in order to get a more accurate result.
      Parameters:
        `image` - a `RenderedImage`.
      Throws:
        `IllegalArgumentException` - if the argument is `null`.

  - ### Method Detail

    - #### createPacked

          public static ImageTypeSpecifier createPacked(ColorSpace colorSpace,
                                                        int redMask,
                                                        int greenMask,
                                                        int blueMask,
                                                        int alphaMask,
                                                        int transferType,
                                                        boolean isAlphaPremultiplied)

      Returns a specifier for a packed image format that will use a `DirectColorModel` and a packed `SampleModel` to store each pixel packed into in a single byte, short, or int.
      Parameters:
        `colorSpace` - the desired `ColorSpace`.
        `redMask` - a contiguous mask indicated the position of the red channel.
        `greenMask` - a contiguous mask indicated the position of the green channel.
        `blueMask` - a contiguous mask indicated the position of the blue channel.
        `alphaMask` - a contiguous mask indicated the position of the alpha channel.
        `transferType` - the desired `SampleModel` transfer type.
        `isAlphaPremultiplied` - `true` if the color channels will be premultipled by the alpha channel.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `colorSpace` is `null`.
        `IllegalArgumentException` - if `colorSpace` is not of type `TYPE_RGB`.
        `IllegalArgumentException` - if no mask has at least 1 bit set.
        `IllegalArgumentException` - if `transferType` if not one of `DataBuffer.TYPE_BYTE`, `DataBuffer.TYPE_USHORT`, or `DataBuffer.TYPE_INT`.

    - #### createInterleaved

          public static ImageTypeSpecifier createInterleaved(ColorSpace colorSpace,
                                                             int[] bandOffsets,
                                                             int dataType,
                                                             boolean hasAlpha,
                                                             boolean isAlphaPremultiplied)

      Returns a specifier for an interleaved image format that will use a `ComponentColorModel` and a `PixelInterleavedSampleModel` to store each pixel component in a separate byte, short, or int.
      Parameters:
        `colorSpace` - the desired `ColorSpace`.
        `bandOffsets` - an array of `int`s indicating the offsets for each band.
        `dataType` - the desired data type, as one of the enumerations from the `DataBuffer` class.
        `hasAlpha` - `true` if an alpha channel is desired.
        `isAlphaPremultiplied` - `true` if the color channels will be premultipled by the alpha channel.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `colorSpace` is `null`.
        `IllegalArgumentException` - if `bandOffsets` is `null`.
        `IllegalArgumentException` - if `dataType` is not one of the legal `DataBuffer.TYPE_*` constants.
        `IllegalArgumentException` - if `bandOffsets.length` does not equal the number of color space components, plus 1 if `hasAlpha` is `true`.

    - #### createBanded

          public static ImageTypeSpecifier createBanded(ColorSpace colorSpace,
                                                        int[] bankIndices,
                                                        int[] bandOffsets,
                                                        int dataType,
                                                        boolean hasAlpha,
                                                        boolean isAlphaPremultiplied)

      Returns a specifier for a banded image format that will use a `ComponentColorModel` and a `BandedSampleModel` to store each channel in a separate array.
      Parameters:
        `colorSpace` - the desired `ColorSpace`.
        `bankIndices` - an array of `int`s indicating the bank in which each band will be stored.
        `bandOffsets` - an array of `int`s indicating the starting offset of each band within its bank.
        `dataType` - the desired data type, as one of the enumerations from the `DataBuffer` class.
        `hasAlpha` - `true` if an alpha channel is desired.
        `isAlphaPremultiplied` - `true` if the color channels will be premultipled by the alpha channel.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `colorSpace` is `null`.
        `IllegalArgumentException` - if `bankIndices` is `null`.
        `IllegalArgumentException` - if `bandOffsets` is `null`.
        `IllegalArgumentException` - if the lengths of `bankIndices` and `bandOffsets` differ.
        `IllegalArgumentException` - if `bandOffsets.length` does not equal the number of color space components, plus 1 if `hasAlpha` is `true`.
        `IllegalArgumentException` - if `dataType` is not one of the legal `DataBuffer.TYPE_*` constants.

    - #### createGrayscale

          public static ImageTypeSpecifier createGrayscale(int bits,
                                                           int dataType,
                                                           boolean isSigned)

      Returns a specifier for a grayscale image format that will pack pixels of the given bit depth into array elements of the specified data type.
      Parameters:
        `bits` - the number of bits per gray value (1, 2, 4, 8, or 16).
        `dataType` - the desired data type, as one of the enumerations from the `DataBuffer` class.
        `isSigned` - `true` if negative values are to be represented.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `bits` is not one of 1, 2, 4, 8, or 16.
        `IllegalArgumentException` - if `dataType` is not one of `DataBuffer.TYPE_BYTE`, `DataBuffer.TYPE_SHORT`, or `DataBuffer.TYPE_USHORT`.
        `IllegalArgumentException` - if `bits` is larger than the bit size of the given `dataType`.

    - #### createGrayscale

          public static ImageTypeSpecifier createGrayscale(int bits,
                                                           int dataType,
                                                           boolean isSigned,
                                                           boolean isAlphaPremultiplied)

      Returns a specifier for a grayscale plus alpha image format that will pack pixels of the given bit depth into array elements of the specified data type.
      Parameters:
        `bits` - the number of bits per gray value (1, 2, 4, 8, or 16).
        `dataType` - the desired data type, as one of the enumerations from the `DataBuffer` class.
        `isSigned` - `true` if negative values are to be represented.
        `isAlphaPremultiplied` - `true` if the luminance channel will be premultipled by the alpha channel.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `bits` is not one of 1, 2, 4, 8, or 16.
        `IllegalArgumentException` - if `dataType` is not one of `DataBuffer.TYPE_BYTE`, `DataBuffer.TYPE_SHORT`, or `DataBuffer.TYPE_USHORT`.
        `IllegalArgumentException` - if `bits` is larger than the bit size of the given `dataType`.

    - #### createIndexed

          public static ImageTypeSpecifier createIndexed(byte[] redLUT,
                                                         byte[] greenLUT,
                                                         byte[] blueLUT,
                                                         byte[] alphaLUT,
                                                         int bits,
                                                         int dataType)

      Returns a specifier for an indexed-color image format that will pack index values of the given bit depth into array elements of the specified data type.
      Parameters:
        `redLUT` - an array of `byte`s containing the red values for each index.
        `greenLUT` - an array of `byte`s containing * the green values for each index.
        `blueLUT` - an array of `byte`s containing the blue values for each index.
        `alphaLUT` - an array of `byte`s containing the alpha values for each index, or `null` to create a fully opaque LUT.
        `bits` - the number of bits in each index.
        `dataType` - the desired output type, as one of the enumerations from the `DataBuffer` class.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `redLUT` is `null`.
        `IllegalArgumentException` - if `greenLUT` is `null`.
        `IllegalArgumentException` - if `blueLUT` is `null`.
        `IllegalArgumentException` - if `bits` is not one of 1, 2, 4, 8, or 16.
        `IllegalArgumentException` - if the non-`null` LUT parameters do not have lengths of exactly `1 << bits`.
        `IllegalArgumentException` - if `dataType` is not one of `DataBuffer.TYPE_BYTE`, `DataBuffer.TYPE_SHORT`, `DataBuffer.TYPE_USHORT`, or `DataBuffer.TYPE_INT`.
        `IllegalArgumentException` - if `bits` is larger than the bit size of the given `dataType`.

    - #### createFromBufferedImageType

          public static ImageTypeSpecifier createFromBufferedImageType(int bufferedImageType)

      Returns an `ImageTypeSpecifier` that encodes one of the standard `BufferedImage` types (other than `TYPE_CUSTOM`).
      Parameters:
        `bufferedImageType` - an int representing one of the standard `BufferedImage` types.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `bufferedImageType` is not one of the standard types, or is equal to `TYPE_CUSTOM`.
      See Also:
        `BufferedImage`, `BufferedImage.TYPE_INT_RGB`, `BufferedImage.TYPE_INT_ARGB`, `BufferedImage.TYPE_INT_ARGB_PRE`, `BufferedImage.TYPE_INT_BGR`, `BufferedImage.TYPE_3BYTE_BGR`, `BufferedImage.TYPE_4BYTE_ABGR`, `BufferedImage.TYPE_4BYTE_ABGR_PRE`, `BufferedImage.TYPE_USHORT_565_RGB`, `BufferedImage.TYPE_USHORT_555_RGB`, `BufferedImage.TYPE_BYTE_GRAY`, `BufferedImage.TYPE_USHORT_GRAY`, `BufferedImage.TYPE_BYTE_BINARY`, `BufferedImage.TYPE_BYTE_INDEXED`

    - #### createFromRenderedImage

          public static ImageTypeSpecifier createFromRenderedImage(RenderedImage image)

      Returns an `ImageTypeSpecifier` that encodes the layout of a `RenderedImage` (which may be a `BufferedImage`).
      Parameters:
        `image` - a `RenderedImage`.
      Returns:
        an `ImageTypeSpecifier` with the desired characteristics.
      Throws:
        `IllegalArgumentException` - if `image` is `null`.

    - #### getBufferedImageType

          public int getBufferedImageType()

      Returns an int containing one of the enumerated constant values describing image formats from `BufferedImage`.
      Returns:
        an `int` representing a `BufferedImage` type.
      See Also:
        `BufferedImage`, `BufferedImage.TYPE_CUSTOM`, `BufferedImage.TYPE_INT_RGB`, `BufferedImage.TYPE_INT_ARGB`, `BufferedImage.TYPE_INT_ARGB_PRE`, `BufferedImage.TYPE_INT_BGR`, `BufferedImage.TYPE_3BYTE_BGR`, `BufferedImage.TYPE_4BYTE_ABGR`, `BufferedImage.TYPE_4BYTE_ABGR_PRE`, `BufferedImage.TYPE_USHORT_565_RGB`, `BufferedImage.TYPE_USHORT_555_RGB`, `BufferedImage.TYPE_BYTE_GRAY`, `BufferedImage.TYPE_USHORT_GRAY`, `BufferedImage.TYPE_BYTE_BINARY`, `BufferedImage.TYPE_BYTE_INDEXED`

    - #### getNumComponents

          public int getNumComponents()

      Return the number of color components specified by this object. This is the same value as returned by `ColorModel.getNumComponents`
      Returns:
        the number of components in the image.

    - #### getNumBands

          public int getNumBands()

      Return the number of bands specified by this object. This is the same value as returned by `SampleModel.getNumBands`
      Returns:
        the number of bands in the image.

    - #### getBitsPerBand

          public int getBitsPerBand(int band)

      Return the number of bits used to represent samples of the given band.
      Parameters:
        `band` - the index of the band to be queried, as an int.
      Returns:
        an int specifying a number of bits.
      Throws:
        `IllegalArgumentException` - if `band` is negative or greater than the largest band index.

    - #### getSampleModel

          public SampleModel getSampleModel()

      Returns a `SampleModel` based on the settings encapsulated within this object. The width and height of the `SampleModel` will be set to arbitrary values.
      Returns:
        a `SampleModel` with arbitrary dimensions.

    - #### getSampleModel

          public SampleModel getSampleModel(int width,
                                            int height)

      Returns a `SampleModel` based on the settings encapsulated within this object. The width and height of the `SampleModel` will be set to the supplied values.
      Parameters:
        `width` - the desired width of the returned `SampleModel`.
        `height` - the desired height of the returned `SampleModel`.
      Returns:
        a `SampleModel` with the given dimensions.
      Throws:
        `IllegalArgumentException` - if either `width` or `height` are negative or zero.
        `IllegalArgumentException` - if the product of `width` and `height` is greater than `Integer.MAX_VALUE`

    - #### getColorModel

          public ColorModel getColorModel()

      Returns the `ColorModel` specified by this object.
      Returns:
        a `ColorModel`.

    - #### createBufferedImage

          public BufferedImage createBufferedImage(int width,
                                                   int height)

      Creates a `BufferedImage` with a given width and height according to the specification embodied in this object.
      Parameters:
        `width` - the desired width of the returned `BufferedImage`.
        `height` - the desired height of the returned `BufferedImage`.
      Returns:
        a new `BufferedImage`
      Throws:
        `IllegalArgumentException` - if either `width` or `height` are negative or zero.
        `IllegalArgumentException` - if the product of `width` and `height` is greater than `Integer.MAX_VALUE`, or if the number of array elements needed to store the image is greater than `Integer.MAX_VALUE`.

    - #### equals

          public boolean equals(Object o)

      Returns `true` if the given `Object` is an `ImageTypeSpecifier` and has a `SampleModel` and `ColorModel` that are equal to those of this object.
      Overrides:
        `equals` in class `Object`
      Parameters:
        `o` - the `Object` to be compared for equality.
      Returns:
        `true` if the given object is an equivalent `ImageTypeSpecifier`.
      See Also:
        `Object.hashCode()`, `HashMap`

    - #### hashCode

          public int hashCode()

      Returns the hash code for this ImageTypeSpecifier.
      Overrides:
        `hashCode` in class `Object`
      Returns:
        a hash code for this ImageTypeSpecifier
      See Also:
        `Object.equals(java.lang.Object)`, `System.identityHashCode(java.lang.Object)`

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