> I try to save the data of an intensity graph as a bitmap. I flatten
> the 2D-array and combine it with "write BMP file". For the color table
> I am using the Property Node/"Color Table" of the intensity graph. It
> works very well for values between 0...max.
> After few calculations the values are also in negative range (e.g.
> -128...0...+128) and the saved image shows only the range beginning at
> 0...+128.
>
It sounds like you are saving the raw 2D data and the color table. This
will be enough information to build a bitmap, but you will have to redo
what the intensity graph does. The intensity graph maps the raw data
into the range 1 to 254, with 0 being below color and 255 being above
color. It also decimates or stretches the data to fit the disp
lay size.
These are the steps for making the bitmap.
An alternative is to use the method to get the control image. This will
return an image, which can be saved as a bitmap. By default it will
have the border and scales on it. If you don't want those, hide them
using properties first, then execute the method.
Greg McKaskle