Some notes on ImageJ macro

th = eval("script","Runtime.getRuntime().availableProcessors();");
print(th);

filepath = "/my/path/to/great_image.tif";

//Method 1, string indexing
basename = substring(filepath, lastIndexOf(filepath, "/")+1, lastIndexOf(filepath, "."));
print("Method 1: ", basename);

//Method 2, regular expression
basename = replace(filepath, "(.*\\/)(.*)\\..{3,5}$", "$2");
print("Method 2: ", basename);
//... in this case, it's also possible to get the parent directry just with a small modification
parent = replace(filepath, "(.*\\/)(.*)\\..{3,5}$", "$1");
print(".... parent: ", parent);

//Method 3, use a specific command
//from ver. 1.52r
basename = File.getNameWithoutExtension(filepath);
print("Method 3: ", basename);
//... it's also possible to get the parent directory with a command. 
parent = File.getDirectory(filepath);
print(".... parent: ", parent);

for (j =0; j<getHeight();j++){
	for (i=0; i<getWidth();i++){
		pix =  getPixel(i, j);
		sum = sumRGB(pix);
		if (sum == 0){
			setPixel(i, j, 0xffffff);
		}
	}
}


function sumRGB(RGBpixval){
	sum = getR(pix) + getG(pix) + getB(pix);
	return sum;
}

function getR(RGBpixval){
	rf = (RGBpixval & 0xff0000)>>16;
	return rf;       
}
function getG(RGBpixval){
	gf = (RGBpixval & 0x00ff00)>>8;
	return gf; 
}
function getB(RGBpixval){
    bf = (RGBpixval & 0x0000ff); 
    return bf;        
}