How to invert colors?
fCoder Batch Converters allow you to invert colors. For example, if you have black and white bitmap file and want to convert it to gif format so that white areas become black and black areas become white, fCoder Batch Converters can help you with that. Use option -oper Effect effect:negative and all colors on your image or images will become inverted.
ICPCL.exe -convertto tiff -source "C:\source\*.*" -dest "C:\out" -oper Effect effect:negative