Re: Marking areas of like pixel values.

Posted by Kenneth Sloan-2 on
URL: http://imagej.273.s1.nabble.com/Marking-areas-of-like-pixel-values-tp5019664p5019667.html

Look at the .fit file header (it’s plain text).  What’s the value for “BITPIX”?

Your camera may take 12-bit images, but that doesn’t necessarily mean the file has 16-bits per pixel.

If the file DOES specify 16 bits per pixel, then something is wrong with the ImageJ reader (and it should be fixed).
But - as previously noted, that should be easy to fix by changing the image Type immediately after loading it.

Question: do you know the actual range of pixel values produced by the camera?  Do you know if the low-order bits are
significant?
—
Kenneth Sloan
[hidden email] <mailto:[hidden email]>
Vision is the art of seeing what is invisible to others.

> On Nov 6, 2017, at 10:33, D Williams <[hidden email]> wrote:
>
> I am taking pictures with a 12 bit camera in .FIT file format. When I open
> them in Fiji it says
>
> they are 32 bit and therefore it won't perform auto thresholding on them
> because it says
>
> this only works for 8 or 16 bit  images.
>
> Why and how does it change my 12 bit image into something that it is not?
>
>
>
> Dean
>
>
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