An OperationDescriptor describing the "Subtract"
operation.
The Subtract operation takes two rendered or renderable images,
and for every
pair of pixels, one from each source image of the corresponding
position and band, subtracts the pixel from the second source from
the pixel from the first source. No additional parameters are
required.
The two source images may have different numbers of bands and
data types. By default, the destination image bounds are the
intersection of the two source image bounds. If the sources don't
intersect, the destination will have a width and height of 0.
The default number of bands of the destination image is equal
to the smallest number of bands of the sources, and the data type
is the smallest data type with sufficient range to cover the range
of both source data types (not necessarily the range of their
sums).
As a special case, if one of the source images has N bands (N >
1), the other source has 1 band, and an ImageLayout
hint is provided containing a destination SampleModel
with K bands (1 < K <= N), then the single band of the 1-banded
source is subtracted from or into each of the first K bands of the
N-band source.
If the result of the operation underflows/overflows the
minimum/maximum value supported by the destination data type, then
it will be clamped to the minimum/maximum value respectively.
The destination pixel values are defined by the pseudocode:
dst[x][y][dstBand] = clamp(srcs[0][x][y][src0Band] -
srcs[1][x][y][src1Band]);
Resource List
| Name | Value |
|---|
| GlobalName | Subtract |
| LocalName | Subtract |
| Vendor | com.sun.media.jai |
| Description | Subtracts one image from
another image. |
| DocURL | http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/SubtractDescriptor.html |
| Version | 1.0 |
No parameters are needed for this operation.
See Also: javax.media.jai.OperationDescriptor | 