[Qgis-user] Four band raster displaying funny

[Jonathan Moules]

Hi List,
I've got a 4 band raster aerial photography (RGBI) that comprises lots of
tiles. I've merged some of the tiles together with:

gdal_merge -o 1.tif -of GTiff -co TILED=YES -co BIGTIFF=YES -co
> COMPRESS=JPEG -co JPEG_QUALITY=50 -co BLOCKXSIZE=512 -co BLOCKYSIZE=512
> --optfile tiff_list.txt


But the resultant file looks funny in QGIS.
This is what the source file looks like (correct):
[image: Inline images 1]

This is what the merged file looks like (wrong):
[image: Inline images 2]

All the shadows are a whitey colour. This doesn't happen with 3-band (RGB)
images.
I've tried comparing individual bands; they all look different in the
4-band.

However, if I open the four-band in ArcGIS, it looks fine (both source and
original).

Anyone know what's going on? Is it a QGIS bug or is it doing something
"smart"; I can't see anything odd going on with symbology.

Thanks,
Jonathan

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