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When I run apall for my images I get the warnning:Warning: Image(s) are not two dimensional (ignoring higher dimensions)How can my image be of higher dimensions ?! Thanks!

Use IMHEAD to check the dimensions of an image, and note that a size such as "[1024,1024,1]" is technically considered a 3-D image. You can use image sections such as "[*,*,1]" to pass in a true 2-D section, or IMCOPY it out to a new image.

But the header doesn't show any higher dimentions:CCDSEC = '[15:2055,56:820]'
BIASSEC = '[1:2041,1:765]'

I meant to look at the output of IMHEAD such as with[code:1:9bbbe94f2a]
cl> imhead dev$pix
dev$pix[512,512][short]: m51 B 600s
[/code:1:9bbbe94f2a]where this says the image is 512x512. You could also do something like[code:1:9bbbe94f2a]cl> hselect foo.fits i_naxis yes[/code:1:9bbbe94f2a]to simply print the number of axes in the image. What you've shown are simple keywords in the header, this doesn't actually say how big the image is.