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Hello,
Thanks for the quick replies.  I've been able to get cosbell to work on other images, so it must have something to do with the particular image I'm trying to make the filter for.  I've attached the image that I'm trying to make the filter for, so maybe you can give it a try.  As a note, it's been converted from a fits file using fits2ndf, but I'm not sure if that makes a difference.
Thanks,
Todd

On 23 February 2011 13:54, Malcolm J. Currie <[log in to unmask]> wrote:
The application probably works from a given image, to know what
shape of image you need, and to copy other properties.

Correct.


If the given image stores integer data, perhaps the synthesised image also does. And in integers the cosine function can take only the values 1, 0 or -1. Just a wild, guess, what the data type in the given image is.

COSBELL works in floating point.

Malcolm