[Gegl-developer] Colorspace conversion?

[neota at softhome.net]

I've compiled and installed GEGL and BABL, and I just tried to edit 
drop-shadow.xml,
replacing
<node class='load' path='data/vinci-fly3.jpg'/> with 

<node class='load' path='data/test0.png'/>
to test colorspace conversion (test0.png is a 8bit greyscale image).
I've tried giving test0.png alpha channel or removing the alpha channel, but 
in all cases this results:
(from running 'gegl drop-shadow.xml -o drop-shadow.png') 


** (process:5857): WARNING **: color type mismatch 

** (process:5857): WARNING **: calc have rect of data/test0.png failed 

** (process:5857): WARNING **: color type mismatch 

** (process:5857): WARNING **: GeglOpPlugIn-png_load is data/test0.png 
really a PNG file?
Segmentation fault 


The only case in which it works correctly is if I convert test0.png to RGB.
What is going on here?