photoshop geotiff

[joerg p]

hello,

I would like to adjust colors of a geotiff in photoshop:

Before editing I can display it with mapserver and open it with globalmapper
then I open the file in photoshop
i adjust the color
i save the tiff
I write the geotiff tag again with GeoTiffExamine

But now i can't display it with mapserver and when I open it with
globalmapper, it says:
'wrong data type 1 for XML Packet'; tag ignored
'unknown field with tag 34665 encountered'

How do I save it right with photoshop?
I have no compression and tried also tif for mac and pc, no difference.

Joerg