Hello, I'm trying to learn some basic IDL to create scripts for batch processing of a large number of files with ENVI. Unfortunately, I ran into a problem at the very beginning, which I can't seem to solve. I wanted to do something very basic: open a raster file and calculate the data minimums for each band. This is what I have so far: PRO hello world compile_opt strictarr envi, /restore_base_save_files envi_batch_init, log_file='batch.log&' ; Open the input file ENVI_OPEN_FILE, 'C:\test\sp5.tif', R_FID = fid IF (fid EQ -1) THEN BEGIN ENVI_BATCH_EXIT RETURN ENDIF PRINT, fid ; output from console: 2 envi_file_query, fid, dims=dims print, dims ; output from console: -1 0 1267 0 3498 pos=[0] ; Calculate the basic statistics ENVI_DOIT, 'envi_stats_doit', FID = fid, DIMS = dims, pos = pos, DMIN = dmin print, dmin envi_batch_exit END After the "print, dmin" line, I receive this error: % PRINT: Variable is undefined: DMIN. % Execution halted at: TINYROUTINE 30 C:\test\tinyroutine.pro $MAIN$ Why didn't envi_stats_doit create the variable "dmin", as expected? The raster file was apparently correctly loaded, because "print, dims" shows the correct dimensions of the image. What can be done to change this? Thanks for any suggestions! :)