**System Information**
Operating system and graphics card
Intel i5 4670
8gb ram
radeon 270x
**Blender Version**
Blender 2.73
**Short description of error**
Unable to get correct Image/ Alpha out of the ID Mask node while compositing whilst trying to seperate objects or materials using the pass index / Id mask
{F142171}
**Exact steps for others to reproduce the error**
{F142170}
simple scene setup with two objects with different materials and pass index 1 and 2 (enable material index /object index under rederlayers --> passes)
go to compositing, set up as shown in the image
**Note**
Im not quite sure if its actually a bug or not but id would still be quite nice to know why that isnt working as usual.