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Hello Nelson, Frank & Co,I redid the production of gif color images of Mars from input FITS files
that I had changepixed from u2 to real format, and the problem persists.
Namely, the part of any input intensity distribution above 32768 is
sawed off in the Export/colormapping process. The gif images then look
like Cerro Tololo's mountaintop.This is easily seen by making a contour map of the input image with a
floor of 32768 & comparing that to the output gif image.A quick semi-fix is just dividing the input file by a number that will
lower the peak intensity below 32768.So, I'll look forward to hearing from you!
Pete

Hi Peter; I can see the effect of exporting the fits file to gif file using
export. I got bands across the image obliterating the input range. I used 'xv' to load the fits file and then saving it as gif. The
bands are gone and the data looks the same as the input fits file. Do you have xv? If so, please give it a try. In the meantime I'll just
wait for Mike until Monday to see how we can solve this.Thanks,
Nelson >
> Hello Nelson, Frank & Co,
>
> I redid the production of gif color images of Mars from input FITS files
> that I had changepixed from u2 to real format, and the problem persists.
> Namely, the part of any input intensity distribution above 32768 is
> sawed off in the Export/colormapping process. The gif images then look
> like Cerro Tololo's mountaintop.
>
> This is easily seen by making a contour map of the input image with a
> floor of 32768 & comparing that to the output gif image.
>
> A quick semi-fix is just dividing the input file by a number that will
> lower the peak intensity below 32768.
>
> So, I'll look forward to hearing from you!
> Pete
>
>