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

[Etienne Tourigny]

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.

>
> 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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