[Qgis-developer] No transparency with mbtiles raster and QGIS 2.12.1 on Ubuntu 15.10

[Jesse McGraw]

All,
   I'm testing displaying some mbtiles files I created and I'm noticing 
that alpha doesn't appear to be working correctly with them (large solid 
colored blocks displayed instead)

When the tiles are RGBA and compiled to mbtiles they look correct.

Once I use pngquant to compress them to paletted versions and then 
compile then the transparency isn't correct even though I can view the 
individual source tiles and see that the transparency is still there

I found a ticket related to gdal, mbtiles, and transparency 
(https://trac.osgeo.org/gdal/ticket/5439) but I'm not sure how related 
it may be.

Thoughts?

QGIS version

	

2.12.1-Lyon

	

QGIS code revision

	

exported <https://github.com/qgis/QGIS/commit/exported>

Compiled against Qt

	

4.8.6

	

Running against Qt

	

4.8.6

Compiled against GDAL/OGR

	

1.11.2

	

Running against GDAL/OGR

	

1.11.2

Compiled against GEOS

	

3.5.0-CAPI-1.9.0

	

Running against GEOS

	

3.5.0-CAPI-1.9.0 r4084

PostgreSQL Client Version

	

9.4.5

	

SpatiaLite Version

	

4.3.0

QWT Version

	

5.2.3

	

PROJ.4 Version

	

491



Thanks,
   Jesse
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