com.github.jaiimageio.plugins.bmp

Class BMPImageWriteParam



  • public class BMPImageWriteParamextends ImageWriteParam
    A subclass of ImageWriteParam for encoding images in the BMP format.

    This class allows for the specification of various parameters while writing a BMP format image file. By default, the data layout is bottom-up, such that the pixels are stored in bottom-up order, the first scanline being stored last.

    The particular compression scheme to be used can be specified by using the setCompressionType() method with the appropriate type string. The compression scheme specified will be honored if and only if it is compatible with the type of image being written. If the specified compression scheme is not compatible with the type of image being written then the IOException will be thrown by the BMP image writer. If the compression type is not set explicitly then getCompressionType() will return null. In this case the BMP image writer will select a compression type that supports encoding of the given image without loss of the color resolution.

    The compression type strings and the image type(s) each supports are listed in the following table:

    Compression Types
    Type String Description Image Types
    BI_RGB Uncompressed RLE <= 8-bits/sample
    BI_RLE8 8-bit Run Length Encoding <= 8-bits/sample
    BI_RLE4 4-bit Run Length Encoding <= 4-bits/sample
    BI_BITFIELDS Packed data 16 or 32 bits/sample
    BI_JPEG JPEG encoded grayscale or RGB image

    When BI_BITFIELDS is used, if the image encoded has a DirectColorModel, the bit mask in the color model will be written into the stream. Otherwise, only 5-5-5 16-bit image or 8-8-8 32-bit images are supported.

    • Constructor Detail

      • BMPImageWriteParam

        public BMPImageWriteParam(Locale locale)
        Constructs a BMPImageWriteParam set to use a given Locale and with default values for all parameters.
        Parameters:
        locale - a Locale to be used to localize compression type names and quality descriptions, or null.
      • BMPImageWriteParam

        public BMPImageWriteParam()
        Constructs an BMPImageWriteParam object with default values for all parameters and a null Locale.
    • Method Detail

      • getVersion

        public int getVersion()
        Deprecated. 
        Returns the BMP version to be used. The default is VERSION_3.
        Returns:
        the BMP version number.
      • setTopDown

        public void setTopDown(boolean topDown)
        If set, the data will be written out in a top-down manner, the first scanline being written first. Any compression other than BI_RGB or BI_BITFIELDS is incompatible with the data being written in top-down order. Setting the topDown argument to true will be honored only when the compression type at the time of writing the image is one of the two mentioned above. Otherwise, the topDown setting will be ignored.
        Parameters:
        topDown - whether the data are written in top-down order.
      • isTopDown

        public boolean isTopDown()
        Returns the value of the topDown parameter. The default is false.
        Returns:
        whether the data are written in top-down order.

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