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Posted to issues@commons.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/04/05 11:40:00 UTC
[jira] [Work logged] (IMAGING-251) Support TIFF standard floating
point data
[ https://issues.apache.org/jira/browse/IMAGING-251?focusedWorklogId=416177&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-416177 ]
ASF GitHub Bot logged work on IMAGING-251:
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Author: ASF GitHub Bot
Created on: 05/Apr/20 11:39
Start Date: 05/Apr/20 11:39
Worklog Time Spent: 10m
Work Description: gwlucastrig commented on pull request #72: IMAGING-251 support for TIFF floating-point formats
URL: https://github.com/apache/commons-imaging/pull/72
This change adds the ability to obtain images from TIFF files that give data in the floating-point format. It partially addresses IMAGING-251. It also adds two example applications to show how to use the Commons Imaging API for TIFF images and adds one additional small sample TIFF data file that uses the floating-point format.
I saw that the project pom.xml specified PMD, so I run PMD and made minor PMD changes. In keeping with the project guidelines, PMD changes were done only for the files that I otherwise modified.
I ran all test cases successfully.
Additional changes to support numerical access for these files will be provided in a future patch.
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Issue Time Tracking
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Worklog Id: (was: 416177)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Priority: Major
> Fix For: 1.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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