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Possible pixel bounds checking bug in imcopy

 
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Jason Quinn
IRAF Guru


Joined: 07 Apr 2006
Posts: 151
PostPosted: Thu Sep 13, 2012 2:10 am    Post subject: Possible pixel bounds checking bug in imcopy Reply with quote
When I use imcopy on a .imh image such as dev$pix, it reports an error if I try to copy a section that exceeds the boundary of the image:

Code:
vocl> imhead dev$pix
dev$pix[512,512][short]: m51  B  600s
vocl>
vocl> imcopy dev$pix[*,1:512] test1.fits
dev$pix[*,1:512] -> test1.fits
vocl>
vocl> imcopy dev$pix[*,1:513] test2.fits
dev$pix[*,1:513] -> test2.fits
ERROR: Pixel storage file is truncated (dev$pix[*,1:513])


If however I use a FITS image, I do not get a warning for several pixels past the boundary of the image.

Code:

vocl> imcopy dev$pix jjj.fits
dev$pix -> jjj.fits
vocl>
vocl> imhead jjj.fits
jjj.fits[512,512][short]: m51  B  600s
vocl>
vocl> imcopy jjj.fits[*,1:512] test3.fits
jjj.fits[*,1:512] -> test3.fits
vocl>
vocl> imcopy jjj.fits[*,1:513] test4.fits
jjj.fits[*,1:513] -> test4.fits
vocl>
vocl> imcopy jjj.fits[*,1:514] test5.fits
jjj.fits[*,1:514] -> test5.fits
vocl>
vocl> imcopy jjj.fits[*,1:515] test6.fits
jjj.fits[*,1:515] -> test6.fits
ERROR: Pixel storage file is truncated (jjj.fits[*,1:515])


Are the [*,1:513] and [*,1:514] commands exposing some sort of error checking bug? The file is only 512x512.

If I run fitsverify on the test image, test2.fits and test6.fits give fatal errors while test3.fits and test4.fits are valid FITS files but they have been extended by 1 and 2 pixels, respectively, in the y-direction.

Also, when I try an imhead on the files I also get two different results depending on whether I use "*.fits" vs "test*.fits" as the argument to imhead. This seems to violate the principle of least surprise.

Code:

vocl> imhead *.fits
jjj.fits[512,512][short]: m51  B  600s
test1.fits[512,512][short]: m51  B  600s
test2.fits: FXF: EOF encountered while reading FITS file (test2.fits)
test3.fits[512,512][short]: m51  B  600s
test4.fits[512,513][short]: m51  B  600s
test5.fits[512,514][short]: m51  B  600s
test6.fits: FXF: EOF encountered while reading FITS file (test6.fits)
vocl> imhead test*.fits
test1.fits[512,512][short]: m51  B  600s
ERROR: Seek error on file (skyfire!/home/jquinn/projects/test2.fits)


Cheers,
Jason
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fitz
Site Admin


Joined: 30 Sep 2005
Posts: 3255
Location: Tucson
PostPosted: Wed Sep 26, 2012 4:59 am    Post subject: Reply with quote
Hi Jason,

Just wanted to acknowledge that I can reproduce the problem but haven't had time to look at it in detail yet. It'll be fixed for the next update, thanks for the report.

-Mike
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