[ImageJ-bugs] [Bug 1169] New: Process-Math-Macro...

[bugzilla at fiji.sc]

http://fiji.sc/bugzilla/show_bug.cgi?id=1169

            Bug ID: 1169
           Summary: Process-Math-Macro...
           Product: Fiji
           Version: unspecified
          Hardware: PC
                OS: Windows
            Status: NEW
          Severity: critical
          Priority: P5
         Component: Plugins
          Assignee: imagej-bugs at imagej.net
          Reporter: d.krunic at dkfz.de

Created attachment 263
  --> http://fiji.sc/bugzilla/attachment.cgi?id=263&action=edit
Picture can say 1000 words.

Can you please help, I wanted to use the Process-Math-Macro... option in FIJI
developed based on the Expression plugin, but I cannot get it to work with
16-bit grey images properly. So I wrote the macro for this, but it is much to
slow comparing to the Macro... plugin. 
The Process-Math-Macro... works great for 8-bit, but it does some strange
calculation when it comes to 16-bit. Simple operation, such as

v=getPixel(x, y)-getPixel(x-1, y-1);

gives funny result with 16-bit.
It appears that the new 16-bit processed image is OK but only for the first 2
rows / columns of pixels. All the other pixels are not OK because I guess the
wrong image is targeted; the plugin should target the original image again, but
instead it targets the new image to calculate new values from new values. This
is obviously wrong; it should get pixels from the original image and after that
target the new image and change the values there. Interestingly, it does not do
this for the 8-bit.
Just create a simple File-New-Image with 5x5 pxl 16-bit random fill and try it,
check the middle pixel and you will see what is the problem. Also, create 8-bit
out of the same 16-bit and try the same operation again - you will see that it
works.

Would you have any idea how to fix this?
Thank you very much for your help.

Best regards,
Damir

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