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Re: 16-bit grayscale from URL?

Posted by Wayne Rasband on Nov 17, 2005; 2:22am
URL: http://imagej.273.s1.nabble.com/16-bit-grayscale-from-URL-tp3704396p3704397.html

ImageJ can open 16-bit TIFFs using a URL. For example, the  
File>Import>URL command will open the 16-bit TIFF at "http://
rsb.info.nih.gov/ij/images/m51.tif". PNG files open as RGB or 8-bit  
grayscale.

-wayne

On Nov 16, 2005, at 7:42 PM, John Carlson wrote:

> I am using new ImagePlus(url).show().  Will this
> display a 16-bit greyscale file with 16-bit values
> in ImageJ, or will it convert to 8-bit?  I plan to use
> the PNG file format.  We are using ImageMagick
> to convert to PNG, so if ImageMagick converts to
> 8-bit grayscale, let me know that as well.
>
> I don't really want to go through the trouble of reading
> the PNG into a short array--I'd rather that ImageJ just
> do the right thing when it parses the PNG file.  We
> had problems with passing Java 16-bit grayscale
> Image objects to ImageJ, so I'm wondering if there
> is an issue here as well.
>
> I am using version 1.28.
>
> My users like to see the 16 bit values, hence we don't
> want to convert to 8 bit.  We are using a 12-bit camera
> to capture the images.  We used to use 8-bit cameras,
> so we have mixed data now.
>
> So far, I am seeing 8-bit, but I'm not sure what part of the
> application has 16-bit.  We are attempting to get
> an image we know is 16-bit to try this experiment on.
>
> Obviously, this is a little premature, but I thought I'd
> ask.
>
> John
>