Gary Lucas created IMAGING-251:
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Summary: Support TIFF standard floating point data
Key: IMAGING-251
URL: https://issues.apache.org/jira/browse/IMAGING-251
Project: Commons Imaging
Issue Type: New Feature
Components: Format: TIFF
Affects Versions: 1.x
Reporter: Gary Lucas
Fix For: 1.x
Commons Imaging does not support the floating-point format included in the TIFF
specification. There are prominent data sources that issue products in this
format. The ability to support this information would open up new application
areas for Commons Imaging.
TIFF is often used as a mechanism for distributing data from geophysical
applications in the form of GeoTIFF files. Some of this is not imagery, but
data. For example, the US Geological Survey is currently releasing
high-resolution elevation data grids for the 3DEP program under the name
Cloud-Optimized GeoTIFF (COG). It is a substantial data set with significant
potential commercial and academic applications.
To access this data means modifying the TIFF DataReaderStrips and
DataReaderTile classes to recognize floating point data (which is typically
indicated using TIFF tag #339, SampleFormat). Also, returning the data in the
form of a BufferedImage makes no sense at all, so the API on the
TiffImageParser and supporting classes would need additional methods to return
arrays of floats. The good news here is that that requirement would mean
adding new methods to the classes rather than making significant changes to
existing classes. So the probability of unintended consequences or new bugs in
existing code would be minimized.
Specification details for floating-point are given in the main TIFF-6
documentations and Adobe Photoshop TIFF Technical Note 3.
I am willing to volunteer to make these changes provided that there is interest
and a high probability that my contributions would be evaluated and, if
suitable, integrated into the Commons Imaging code base.
Thank you for your attention in this matter.
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