java.awt.image
Class RescaleOp
- BufferedImageOp, RasterOp
RescaleOp is a filter that changes each pixel by a scaling factor and offset.
For filtering Rasters, either one scaling factor and offset can be specified,
which will be applied to all bands; or a scaling factor and offset can be
specified for each band.
For BufferedImages, the scaling may apply to both color and alpha components.
If only one scaling factor is provided, or if the number of factors provided
equals the number of color components, the scaling is performed on all color
components. Otherwise, the scaling is performed on all components including
alpha. Alpha premultiplication is ignored.
After filtering, if color conversion is necessary, the conversion happens,
taking alpha premultiplication into account.
RescaleOp(float scaleFactor, float offset, RenderingHints hints)- Create a new RescaleOp object using the given scale factor and offset.
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RescaleOp(float[] scaleFactors, float[] offsets, RenderingHints hints)- Create a new RescaleOp object using the given scale factors and offsets.
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clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
RescaleOp
public RescaleOp(float scaleFactor,
float offset,
RenderingHints hints) Create a new RescaleOp object using the given scale factor and offset.
The same scale factor and offset will be used on all bands/components.
scaleFactor - the scale factor to use.offset - the offset to use.hints - any rendering hints to use (can be null).
RescaleOp
public RescaleOp(float[] scaleFactors,
float[] offsets,
RenderingHints hints) Create a new RescaleOp object using the given scale factors and offsets.
The length of the arrays must be equal to the number of bands (or number of
data or color components) of the raster/image that this Op will be used on,
otherwise an IllegalArgumentException will be thrown when calling the
filter method.
scaleFactors - an array of scale factors.offsets - an array of offsets.hints - any rendering hints to use (can be null).
filter
public final BufferedImage filter(BufferedImage src,
BufferedImage dst) Converts the source image using the scale factors and offsets specified in
the constructor. The resulting image is stored in the destination image if
one is provided; otherwise a new BufferedImage is created and returned.
The source image cannot use an IndexColorModel, and the destination image
(if one is provided) must have the same size.
If the final value of a sample is beyond the range of the color model, it
will be clipped to the appropriate maximum / minimum.
- filter in interface BufferedImageOp
src - The source image.dst - The destination image.
filter
public final WritableRaster filter(Raster src,
WritableRaster dest) Performs an operation on the source raster, returning the result in a
writable raster. If
dest is
null, a new
WritableRaster will be created by calling the
RasterOp.createCompatibleDestRaster(Raster) method. If
dest
is not
null, the result is written to
dest then
returned (this avoids creating a new
WritableRaster each
time this method is called).
- filter in interface RasterOp
src - the source raster.dest - the destination raster (null permitted).
getNumFactors
public final int getNumFactors()
Returns the number of scaling factors / offsets.
- the number of scaling factors / offsets.
getOffsets
public final float[] getOffsets(float[] offsets)
Returns the offsets. This method accepts an optional array, which
will be used to store the offsets if not null (this avoids allocating a
new array). If this array is too small to hold all the offsets, the array
will be filled and the remaining factors discarded.
offsets - array to store the offsets in (can be null).
getScaleFactors
public final float[] getScaleFactors(float[] scaleFactors)
Returns the scaling factors. This method accepts an optional array, which
will be used to store the factors if not null (this avoids allocating a
new array). If this array is too small to hold all the scaling factors,
the array will be filled and the remaining factors discarded.
scaleFactors - array to store the scaling factors in (can be null).
- an array of scaling factors.
Copyright (C) 2004, 2006 Free Software Foundation
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