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.
| 
