http://imagej.273.s1.nabble.com/How-to-read-raw-data-as-32-bit-unsigned-in-Java-tp5021772p5021778.html
When I look at the imported images in Fiji I apply Brightness/Contrast with
> If you do this in Java, I think there are a couple of workarounds.
>
> Here's one idea: Since you already can "process these data as ints", you
> should be able to create your own 8-bit RGB image. Of course, you only
> get 8-bits of gray scale.
>
> Here's another idea: you should be able to import the image as a 32-bit
> float image. If there is non-zero data in the upper 8 bits, the image
> will look
> very strange, but at least you'll have a 32-bit array. Next, take each
> 32-bit float pixel value and use Float.floatToRawIntBits to get
> your 32-bit integer values.
>
> Since you can already create the int values from your byte array, I would
> start
> with that idea.
>
> Be careful about signed/unsigned.
>
> Finally, I would consider creating a 24-bit integer gray-scale value, and
> using
> that as a 32-bit float (using Float.intBitsToFloat). This gives you a
> float image
> where the values are between 0.0 and 1.0. You can then use an Overlay to
> highlight
> the problem pixels. Use either idea above to get a 32-bit unsigned value,
> and
> scale it to 24-bits. Convert that to a float, and store it in a 32-bit
> float image.
>
> Or, simply create a 16-bit integer gray scale image, and use an Overlay.
>
> Your choice may depend on what you know about the range of values. The
> advantage of
> my 24-bit version above is that you have a bit more flexibility in
> dynamically adjusting
> the range of displayed gray levels. The disadvantage is that the numbers
> will all
> be presented as (0.0..1.0) instead of [0..65535] (for the 16-bit version)
>
> --
> Kenneth Sloan
>
[hidden email]
> Vision is the art of seeing what is invisible to others.
>
>
>
>
>
> > On Feb 12, 2019, at 12:37, Herbie <
[hidden email]> wrote:
> >
> > Good day,
> >
> > ImageJ doesn't support 32 bit integer gray scale images.
> >
> > Supported are 8bit and 16bit integer as well as 32bit float. Furthermore
> 24bit (3 X 8bit) RGB and index color 8bit.
> >
> > Regards
> >
> > Herbie
> >
> > :::::::::::::::::::::::::::::::::::::::::::::
> > Am 12.02.19 um 19:15 schrieb Robert Lockwood:
> >> Working with Java I have raw data files with 32 bit integer gray scale
> data
> >> which I read into a byte[] array. I process these data as ints looking
> for
> >> adjacent pixels that have the same value in order to debug a problem
> with
> >> the camera.
> >> I'd like to create a scaled grayscale RGB from the original data so
> that I
> >> may color the detected adjacent pixels to allow us to detect patterns
> >> visually but I don't understand how to create and populate a grayscale
> >> integer ImageJ array and have not found an example by Google searching.
> >> How do I do this?
> >> TIA
> >> --
> >> ImageJ mailing list:
http://imagej.nih.gov/ij/list.html> >
> > --
> > ImageJ mailing list:
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