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https://issues.apache.org/jira/browse/IMAGING-94?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Lucas updated IMAGING-94:
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Attachment: LucasTrackerItem94_Oct24.patch
This 24 October patch uses the System.arraycopy method as recommended by
Damjan. I have tested it several ways and believe that it is ready for
incorporation into the code tree.
> Add ability to load partial TIFF images
> ---------------------------------------
>
> Key: IMAGING-94
> URL: https://issues.apache.org/jira/browse/IMAGING-94
> Project: Commons Imaging
> Issue Type: New Feature
> Components: Format: TIFF
> Reporter: Gary Lucas
> Attachments: LucasTrackerItem94_Oct14.patch,
> LucasTrackerItem94_Oct24.patch
>
>
> For most Apache Commons Imaging applications, the easiest way to obtain a sub
> image from a file is to simply use the Imaging class to load it as a
> BufferedImage and then use BufferedImage’s getSubimage() method to extract
> the portion of the image you wish to use. The TIFF format presents a special
> problem because it is very common to have huge images (100’s or even 1000’s
> of megapixel). Examples include Landsat satellite images, global-scale
> GeoTIFF images, etc. In such cases, loading the entire image into memory is
> not practical because it would require too much memory. For example, I am
> currently working with a 21600 by 10800 image that requires more than 890
> megabytes to store as a BufferedImage. That value is pushing the limit of
> what I can configure Java to handle on my particular OS.
> I propose to implement features for TIFF files that would permit Commons
> Imaging to load a partial image of a TIFF file using only the amount memory
> actually needed to hold the sub-image.
> These changes would not interfere with normal operations of TIFF files and
> would not affect other image formats. If there were a need for similar
> features for other image formats, they could be phased in through future
> changes.
> The specification for a sub-image would be through the use of the params
> argument in the getBufferedImage call as follows:
> HashMap<String, Object> params = new HashMap<String, Object>();
> params.put(TiffConstants.PARAM_KEY_SUBIMAGE_X, new Integer( x ));
> params.put(TiffConstants.PARAM_KEY_SUBIMAGE_Y, new Integer( y ));
> params.put(TiffConstants.PARAM_KEY_SUBIMAGE_WIDTH, new
> Integer(width));
> params.put(TiffConstants.PARAM_KEY_SUBIMAGE_HEIGHT, new
> Integer(height));
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