Hi fook,
Currently, it is neither possible to apply the Cluster gadget to the image, nor to identify the maximum data point visually.
The following work-around does similar task:
1) On the image, crop the area using the Rectangle tool.
2) Run the following tool. It will produce an image plot of that region with a peak marker, as well as the statistics on the Script window. //////////////////////////////////
img2m; //convert to data matrix
string mat$=%H;
m2w method:=xyz; //convert to a worksheet
string wkb$=%H;
sum(col(3)); //Get stats
minr=sum.imin; //imin for darkest, and imax for brightest
minx=col(1)[minr];
miny=col(2)[minr];
minz=col(3)[minr];
meanz=sum.mean;
sdz=sum.sd;
maxz=sum.max;
minz=sum.min;
win -t plot image; //make an empty image plot
string gr$=%H;
layer -i %(mat$);
layer -a;
speedmode;
window -a %(wkb$);
newsheet;
col(1)[1]=minx;
col(2)[1]=miny;
plotxy iy:=(1,2) plot:=201 ogl:=[gr$]1!1; //plot a marker in the image plot
window -a %(gr$);
range ss=[%(wkb$)]2!2;
set ss -c 2; //RED
set ss -k 2; //Circle
set ss -kf 4; //Center Plus
type -a Z value at point is $(minz) at ( $(minx) , $(miny) );
type -a Region Statistics: Mean: $(meanz), SD: $(sdz), Max: $(maxz), Min: $(minz);
//////////////////////////////////
Hope this helps.
--Hideo Fujii
OriginLab
