// retrieves the calibration info from tiff tag 34682
// uses https://imagej.nih.gov/ij/plugins/tiff-tags.html
// adapted from https://imagej.nih.gov/ij/macros/SetScaleFromTiffTag.txt

tagnum=34682;
path = getDirectory("image");
if (path=="") exit ("path not available");
name = getInfo("image.filename");
if (name=="") exit ("name not available");
path = path + name;
tag = call("TIFF_Tags.getTag", path, tagnum);
print (tag);
i0 = indexOf(tag, "PixelWidth=");
if (i0==-1) exit ("Scale information not found");
i1 = indexOf(tag, "=", i0);
i2 = indexOf(tag, " ", i1);
pixelSize = 1E6*substring(tag,i1+1,i2);
setVoxelSize(pixelSize, pixelSize, 1, "micron");


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