Re: Calculator Plus

Posted by Herbie on Mar 27, 2017; 1:03pm
URL: http://imagej.273.s1.nabble.com/Calculator-Plus-tp5018377p5018378.html

Good day Thomas,

you wrote:

"[...] by showing the difference of two identical 16-bit images, one
stored as jpg and one as tiff.""

How did you manage to get a 16bit JPEG-compressed image? As far as I
know JPEG-compression is limited to 8bit (RGB) images.

Just curious

Herbie

::::::::::::::::::::::::::::::::::::::::::::
Am 27.03.17 um 13:50 schrieb Thomas Eschner:

> Dear all,
>
> I am trying to illustrate artefacts introduced by storing files as
> jpg by showing the difference of two identical 16-bit images, one
> stored as jpg and one as tiff.
>
> With Calculator Plus, setting e.g. Subtract with k1 = 1 and k2 = 16,
> I end up with files having their values set to 65535 exclusively.
>
> Only with k2 = 0 I seem to get more or less reasonable results, but I
> lose negative values.
>
> Could please anybody give me a hint?
>
> Thank you.
>
> Kind regards, Thomas
>
> -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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