[geotk] [JIRA] Created: (GEOTK-100) Needs more control on the conversion performed by SpatialImageReader

[Martin Desruisseaux (JIRA)]

Needs more control on the conversion performed by SpatialImageReader
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                 Key: GEOTK-100
                 URL: http://jira.geotoolkit.org/browse/GEOTK-100
             Project: Geotoolkit
          Issue Type: Improvement
          Components: Coverage
    Affects Versions: 3.11
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux
             Fix For: 3.12


{{SpatialImageReader}} (a {{javax.imageio.ImageReader}} specialization) performs some conversions of sample values during the reading process:

* Negative integer values may be shifted to a positive range of values.
* Fill values may be replaced by NaN values.

We need to provide more control on the conversions that can be applied. By default, {{SpatialImageReader}} should avoid any conversions not strictly necessary, including the conversion of fill values. The later should be allowed only if the following method is explicitly invoked:

{code:java}
SpatialImageReadParam.setSampleConversionAllowed(SampleConversionType.REPLACE_FILL_VALUES, true);
{code}

{{REPLACE_FILL_VALUES}} needs to be added in the list of enum currently declared in {{SampleConversionType}}. It may be worth to add an {{STORE_AS_FLOATS}} enum as well.


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