[Qgis-developer] No data value in raster transparency list

[Radim Blazek]

On Wed, Aug 22, 2012 at 6:13 PM, Etienne Tourigny
<etourigny.dev at gmail.com> wrote:
> On Wed, Aug 22, 2012 at 1:11 PM, Bob and Deb <bobdebm at gmail.com> wrote:
>> I've seen nodata with huge float32 values.  Unfortunately they are rendered
>> in qgis and I can not make them transparent by adding the value to the
>> transparency list.
>
> that's because gdal provider chooses a nodata value that is out of the
> range of "real" values, when file does not contain a nodata value.

Yes. I agree that it is confusing for users. I would like to hide from
users those internal nodata values, removing it from the transparency
list is one step.

Radim

>> On Aug 22, 2012 8:56 AM, "Giovanni Manghi" <giovanni.manghi at faunalia.pt>
>> wrote:
>>>
>>> It isn't the only odd thing/bug with nulls and transparency. For example
>>> not always nulls are rendered transparent and when you try to add them to
>>> the transparency list the entry is added as 0 instead.
>>>
>>> On Aug 22, 2012 4:49 PM, "Radim Blazek" <radim.blazek at gmail.com> wrote:
>>> >
>>> > Hi,
>>> > does anybody know why raster no data value is automatically added to
>>> > transparency list in properties dialog? It makes no sense IMO. No data
>>> > values are always rendered as transparent, no need to define them also
>>> > in transparent list.
>>> >
>>> > Radim
>>> > _______________________________________________
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>>>
>>>
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>>
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