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Re: Scale the psf on images. [message #89995 is a reply to message #89969]

Tue, 13 January 2015 22:50

anes.tziamtzis
Messages: 9
Registered: January 2015

Junior Member

Hi Russel,

Thanks a lot for your tip. I need to ask sometihng extra. I used the following:
fits_read, 'im1.fits',image1,header1
fits_read, 'im2.fits',image2,header2
fits_read, 'im1.fits.psf.1.fits',image3,header3
fits_read, 'im2.fits.psf.1.fits',image4,header4

;Compute the difference kernel
psf1=fft(image3)
psf2=fft(image4)

kernel = REAL_PART(FFT(psf1/psf2, /INVERSE))

image2_prime = convolve(image2, kernel)
diff = image1 - image2_prime

WRITEFITS,'im_conv.fits',diff,header1

end

No stars are seen in the resulting image, but the background has crazy values. The range is from -9e-8 to 9e8. What i have done wrong here?

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[Message index]

		Scale the psf on images. By: anes.tziamtzis on Mon, 12 January 2015 00:15
		Re: Scale the psf on images. By: rryan%stsci.edu on Mon, 12 January 2015 01:17
		Re: Scale the psf on images. By: anes.tziamtzis on Mon, 12 January 2015 04:38
		Re: Scale the psf on images. By: anes.tziamtzis on Tue, 13 January 2015 22:50
		Re: Scale the psf on images. By: Mats Löfdahl on Wed, 14 January 2015 00:43
		Re: Scale the psf on images. By: Mats Löfdahl on Mon, 12 January 2015 02:42
		Re: Scale the psf on images. By: rryan%stsci.edu on Mon, 12 January 2015 04:57
		Re: Scale the psf on images. By: bstecklu on Tue, 13 January 2015 00:59
		Re: Scale the psf on images. By: anes.tziamtzis on Wed, 14 January 2015 23:13
		Re: Scale the psf on images. By: Mats Löfdahl on Wed, 14 January 2015 23:58
		Re: Scale the psf on images. By: anes.tziamtzis on Thu, 15 January 2015 00:04
		Re: Scale the psf on images. By: Mats Löfdahl on Thu, 15 January 2015 02:19
		Re: Scale the psf on images. By: anes.tziamtzis on Thu, 15 January 2015 05:33
		Re: Scale the psf on images. By: Mats Löfdahl on Thu, 15 January 2015 07:08
		Re: Scale the psf on images. By: Mats Löfdahl on Thu, 15 January 2015 07:12

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