Any ideas on how to force a 1bit raster output in ArcGIS 10.1? By default, ArcGIS is being very dense about recognizing pixel depth. I have a binary raster [0,1] and a mask raster  and they are being written as 32bit. Because of this they are ~10GB rather than ~32MB.
The raster dimensions are row=51836, col=53276 at 30m. I am outputting an "img" format. I tried writing into a filegeodatabase and it outputs 8bit. However, when I try to convert the filegeodatabase raster into a img format it produces a garbage raster (scrambled pixels representing only part of the image). In the arguments for the "convert raster to different format" (ArcCatalog context menu), I am specifying 1 bit and removing the default NoData value or setting it to a 0 background value. The resulting rasters are either still 32bit or garbage.
When originally creating the rasters, I am wrapping my raster calculator statement in Int() but am still getting 32bit, which should not be possible. I could imagine 8bit output, but 32bit is nonsensical for integer and is normally assigned to floating point. I do have my geoprocessing environment defined and am working in an Albers projection.