[Spm] image comparison and subtraction

[Ignacio Horcas]

Dear Iain McNab,

WSxM 4.0 Develop 13.0 allows this process. First of all you have to 
open both images. Then select in the menu:

(1) Process -> Filter -> Align images. Press on "Select Images..." to 
choose the images to align and press OK in both dialog-boxes.
(2) Process -> Zoom or Process -> Multiple Dynamic Zoom to trim the 
same area in both images.
(3) Process -> Filter -> Merge. Add both images using -1 as the Image 
Factor for one of them.

I recommend you to use the native *.SM4 format.

Best regards,

Ignacio Horcas.

At 11:45 02/04/2009, spm-request at spmlist.di.com wrote:
>Dear All,
>
>Could someone please recommend to me the best (and simplest) way of doing the
>following:
>
>(1) Comparing two images (that have drift between them) to find the best
>possible overlap (I'm guessing a correlation program of some sort).
>(2) Then trimming both images so they show the same area.
>(3) Subtracting the resulting images from one another.
>
>I know I can do this "visually" in photoshop etc., but I'm hoping there is a
>more precise solution on offer. At present I have the images as both bitmaps,
>and also in RHK's native format, *.SM4.
>
>All help will be most gratefully received, thank you for your time.
>
>Best regards.... Iain McNab
>
>URL:    http://www.utoronto.ca/jpolanyi
>URL:    http://www.phys.ncl.ac.uk/research/atomic/irm/mcnabgroup.htm
>**********************************************************************
>Iain R. McNab
>Department of Chemistry
>University of Toronto
>80 St. George Street
>Toronto, Ontario, M5S 3H6
>Canada
>
>Tel. No.: (416) 978-3625
>Fax No.:  (416) 978-7580
>E-mail:   imcnab at chem.utoronto.ca
>**********************************************************************

Ignacio Horcas

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