Re: [Gimp-developer] viewing Dectris X-ray detector data

[Burnie <west ieee org>]

On 12/22/2011 05:26 AM, Rob Antonishen wrote:
>     I was wondering how easy (?!) it might be to change the GIMP data
>     input/output routines so that instead of reading/writing jpg images
>     "GIMPX" could read/write Dectris X-ray detector format data...
>
>     http://www.dectris.com/sites/pilatus1m.html
>
>     In fact, we would really only be interested in a very small subset of all
>     the image processing that GIMP can do.  For example, certain zones of the
>     2d detector need to be masked before further data analysis can proceed.
>      The ability to select contiguous regions based on count-rate would be
>     very helpful.
>
>     thanks for any replies !
>
>     Halina
>
>
> A quick look at the link provided indicates that these devices produce 20 bit 
> data:
>   "Dynamic range 20 bits (1:1,048,576)"
>
> Currently GIMP is limited to 8 bits per channel, so it is not likely capable 
> of dealing with these images at this time.
I also noticed this 20-bit range - however, GIMP processes 24 bits per pixel, 
eight bits of each red, green, and blue.

The 20-bit outputs of the photon counters could be partitioned into three 
colored data streams; seems likely that the masking and partitioning of the 
counter data could be handled by an appropriately designed plug-in.

Just reading a TIFF file with 20-bit resolution grayscale probably would not 
work, as the data probably would be truncated. But don't give up on current GIMP 
yet. A TIF front-end in a plug-in that properly partitioned might help.
> -Rob A>
>
>
>
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-- Burnie West
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