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I am having a issue with mscarith. I was subtracting my zerocombined image from my science frames and everything is working fine, until I changed to another directory. I started getting the error "Image parameter not found (CCDMNTMP)". I checked all the headers for the files in that directory and they have values for CCDMNTMP. What should I do to correct this error because mscarith outputs a new image but, it is the exact same as science frame that I want to correct.

Frank is away this week and may follow up: This has come up twice before with separate causes. In one case, the CCDMEAN keyword didn't exist in each of the extensions being used (the task checks only the first extension and then assumes all others have the same keyword) and so the message itself is valid. In another case, specifying an input image which didn't exist, or specifying an output image which *does* already exist, caused the error (but the message was actually a side-effect). Since you say this happens after changing directories I would suspect the second cause. Hope this helps.

I just saw this post. Are you still having trouble? I can try to help.Frank Valdes