PMLLancao

Dear GitHub community 

I was wondering if someone can help me to improve a Macro that I found here https://imagej.nih.gov/ij/macros/SubractMeasuredBackground.txt  
I do not know how to write proper macros so I am trying to adapt it. 

I would like to do a background subtraction from an ROI to every single image of a folder, but I would like to have the" waitforuser" command in this macro because every image has different element on it, and I will have to choose every time a different spot in the image to draw a ROI. 
Furthermore, I would like to save these processed images in another folder as Tiff or as the original file from Zeiss .LSM.
So far the macro runs and opens and processed only the first image.

/ This macro subtracts the mean gray level calculated 

PMLLancao

macro "Ratiometric FRET" {

path    = getDirectory("Choose a Directory");
list    = getFileList(path);
length  = list.length;

File.makeDirectory(path + "Imaging/");

//FRET map creation