Am Donnerstag 10 September 2009 13:34:07 schrieb Stefan Krüger:
> Hi
>
> When i create an ImagePyramidReader or am ImageMosaicReader with parameters
> sourceURL and Hints, how to i set/change the transparent input color
> programatically? Before or after the constuction.. i just can't find a way.
>
> > Hints hints = new Hints();
> > reader = new ImagePyramidReader(theURL, hints);
>
> I have tried to follow the hints through the process, but i don't get it
> how a Hint given to the ImagePyramidReader can end up as a
> GeneralParameterValue in calls to
>
> > public GridCoverage read(GeneralParameterValue[] params) throws
> > IOException {
>
> because it looks like the readParams are just set once in the setInfo()
> method
>
> of the *Format:
> > // reading parameters
> > readParameters = new ParameterGroup(new
> > DefaultParameterDescriptorGroup(mInfo, new GeneralParameterDescriptor[]{
> > READ_GRIDGEOMETRY2D,
> > INPUT_TRANSPARENT_COLOR,
> > INPUT_IMAGE_THRESHOLD_VALUE,
> > OUTPUT_TRANSPARENT_COLOR,
> > USE_JAI_IMAGEREAD,
> > BACKGROUND_VALUES,
> > SUGGESTED_TILE_SIZE,
> > ALLOW_MULTITHREADING,
> > MAX_ALLOWED_TILES}));
>
> I thought about overwriting the setInfo() method in ImageMosaicFormat, but
> it is a final class.
>
> Personally i have just added a setInputTransparentColor(Color c) method to
> the ImageMosaicReader and ImagePyramidReader classes, but as i am preparing
> a patch for better URL handling
> ( http://jira.codehaus.org/browse/GEOT-2695 ) i want to do it the GT way as
> much as possible.
>
> Greetings,
> Steve
Hi. I looked at it more and i think it is not possible. If nobody rejects i
will open a JIRA and add a patch to add simple setInputTransparentColor and
setOutputTransparentColor to ImagePyramidReader and ImageMosaicReader. If the
color is set on the PyramidReader, it will propagate it to all MosaicReaders
used.
Greetz
Steve
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