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Re: [Geotools-gt2-users] grid coverage to bufferedimage
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From: Gabriella T. <Gab...@ni...> - 2014-12-04 21:24:39
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Thanx for the tip Andrea. That didn't work but this did, debugging I saw that what being returned was a RenderedOp
RenderedOp ri = (RenderedOp)gc.getRenderedImage();
sourceBufferedImage = ri.getAsBufferedImage();
Now I figured that I could do the same for getting the BufferedImage for a tif image, but no, it does not. Even though the
the instance returned is also a RenderedOp, I run into trouble when trying to render the image:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -2147385344
at java.awt.image.ComponentColorModel.getRGBComponent(ComponentColorModel.java:903)
at java.awt.image.ComponentColorModel.getRed(ComponentColorModel.java:944)
at java.awt.image.ComponentColorModel.getRGB(ComponentColorModel.java:1135)
at sun.java2d.loops.OpaqueCopyAnyToArgb.Blit(CustomComponent.java:145)
at sun.java2d.loops.GraphicsPrimitive.convertFrom(GraphicsPrimitive.java:560)
at sun.java2d.loops.GraphicsPrimitive.convertFrom(GraphicsPrimitive.java:541)
at sun.java2d.loops.MaskBlit$General.MaskBlit(MaskBlit.java:189)
at sun.java2d.loops.Blit$GeneralMaskBlit.Blit(Blit.java:204)
at sun.java2d.pipe.DrawImage.blitSurfaceData(DrawImage.java:955)
at sun.java2d.pipe.DrawImage.renderImageCopy(DrawImage.java:576)
at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:86)
at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:1026)
at sun.java2d.pipe.ValidatePipe.copyImage(ValidatePipe.java:196)
at sun.java2d.SunGraphics2D.copyImage(SunGraphics2D.java:3082)
at sun.java2d.pipe.DrawImage.makeBufferedImage(DrawImage.java:332)
at sun.java2d.pipe.DrawImage.renderImageXform(DrawImage.java:392)
at sun.java2d.opengl.OGLDrawImage.renderImageXform(OGLDrawImage.java:89)
at sun.java2d.pipe.DrawImage.transformImage(DrawImage.java:212)
at sun.java2d.opengl.OGLDrawImage.transformImage(OGLDrawImage.java:100)
at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:3340)
at riskscape.map.internal.render.GridCoverageMapContent.draw(GridCoverageMapContent.java:48)
Even though from exploring in debug both asc and tif both have a grayscale color model.
I tried many ways of obtaining a BufferedImage for the tif and the only way that worked for me was this:
ImageDecoder decoder = ImageCodec.createImageDecoder("tiff", file, null);
RenderedImage ri = decoder.decodeAsRenderedImage();
PlanarImage pi = new NullOpImage(ri, new ImageLayout(ri), null, OpImage.OP_IO_BOUND);
sourceBufferedImage = pi.getAsBufferedImage();
which bypasses reading the file into a grid coverage and sorts of defeats the purpose of what I am trying to do.
Why does one work and not the other?
Gaby
________________________________
From: and...@gm... <and...@gm...> on behalf of Andrea Aime <and...@ge...>
Sent: Thursday, December 4, 2014 10:28 PM
To: andrea antonello
Cc: Gabriella Turek; geotools users
Subject: Re: [Geotools-gt2-users] grid coverage to bufferedimage
On Thu, Dec 4, 2014 at 7:36 AM, andrea antonello <and...@gm...<mailto:and...@gm...>> wrote:
How can I go from a grid coverage obtained from an ASCII grid file to a
buffered image ?
RenderedImage renderedImage = coverage.getRenderedImage();
Not sure, but from memory (can't check right now), depending on the file type, this should be a BufferedImage. If you have tiles data in the back, I think you should also call getData, to make sure that everything is read into a single tile and put in the BufferedImage.
A general approach would be:
RenderedImage renderedImage = coverage.getRenderedImage();
PlanarImage.wrapRenderedImage(renderedImage).getAsBufferedImage();
Checking if the renderedImage is already an instance of buffered image would like help performance too.
Cheers
Andrea
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