I am afraid that there is not an ENVI programming routine provided for the QuickBird calibration to radiance. You would need to write that yourself using IDL in order to automate that process using IDL code. The calculation is not complicated. You can see the equations in the ENVI Help under Using ENVI > Basoc Tools > Preprocessing Utilities > Calibration Utilities > QuickBird Radiance Calibration. I imagine that the trickiest part of writing IDL code for this would be parsing the absCalFactor value from the associated QuickBird metadata file (the .imd file, which is just an ASCII file). - Peg

Great, thanks for the response. I'm currently running a script to manually convert the images to radiance using band math, but using this process I have to process each band separably and layer stack the bands back together. The QuickBird Radiance tool processes all the bands together and leaves out the layer stacking, which would save me some time.