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POTiff tiled : how to read a specific tile?
 

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  1. POTiff tiled : how to read a specific tile?
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    <p>I have a tiled imaged. I'm able to read metadata, so I know tile dimensions; but I don't know how to read a specific tile. I have these questions :</p> <ul> <li><p>Suppose my tiff is composed of 128x128 tile, how can I read the tile positioned at 0,0 (x,y)? </p></li> <li><p>How many tiles are present in my tiff file?</p></li> </ul> <p>I try to develop a code to manage a single tile but I don't know how to identify a specific tile position. </p> <pre><code>IImageMetadata metadata = Sanselan.getMetadata(imageFile); TiffDirectory tiffDirectory = ((TiffImageMetadata) metadata).findDirectory(TiffDirectoryConstants.DIRECTORY_TYPE_ROOT); ByteSourceFile byteSource = new ByteSourceFile(imageFile); ArrayList&lt;?&gt; elements = tiffDirectory.getTiffRawImageDataElements(); TiffImageData.Data data[] = new TiffImageData.Data[elements.size()]; for (int i = 0; i &lt; elements.size(); i++) { TiffDirectory.ImageDataElement element = (TiffDirectory.ImageDataElement) elements.get(i); byte bytes[] = byteSource.getBlock(element.offset, element.length); data[i] = new TiffImageData.Data(element.offset, element.length, bytes); } TiffField tileWidthField = tiffDirectory.findField(TiffTagConstants.TIFF_TAG_TILE_WIDTH); if (null == tileWidthField) throw new ImageReadException("Can't find tile width field."); int tileWidth = tileWidthField.getIntValue(); TiffField tileLengthField = tiffDirectory.findField(TiffTagConstants.TIFF_TAG_TILE_LENGTH); if (null == tileLengthField) throw new ImageReadException("Can't find tile length field."); int tileLength = tileLengthField.getIntValue(); TiffImageData.Tiles tile = new TiffImageData.Tiles(data, tileWidth, tileLength); </code></pre> <p>I'm using <a href="http://incubator.apache.org/sanselan/site/index.html" rel="nofollow">Sanselan</a> from Apache incubator to make these operations.</p>
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    1. PO
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      1. PTAnswer
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    1. UStrashgod
    1. USLorenzo Pasquinelli
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POTiff tiled : how to read a specific tile?
      1. USLorenzo Pasquinelli
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    1. COHave you examined the [Example Code & Sample Usage](http://incubator.apache.org/sanselan/site/sampleusage.html)?
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      1. POTiff tiled : how to read a specific tile?
      1. UStrashgod
    2. COYes but it does not report an example on tile extraction and I don't know how to make it.
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      1. POTiff tiled : how to read a specific tile?
      1. USLorenzo Pasquinelli
 

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