I have to convert DPI of more than 5k Tiff images on a monthly basis from 200x200 to 100x100. I can do that in Irfan view using a .bat file that i have created.. the following is the .BAT file code

@"c:\program files\irfanview\i_view32.exe" "e:\batch1*.tif /aspectratio /resample /tifc=4 /dpi=(100,100) /convert=e:\batch2*.tif" %*

Where tifc=4 is Fax 4 compression

However, the above code doesn't help me change the DPI for other pages except for Only the first page in the tiff thats getting converted to 100 DPI. Rest all pages are still 200 DPI. I am using WinXP Professional and Irfan View. Can anyone tell me what I am missing. Or any other alternative program where I can create a .bat file and run the batch process using Command line?