imageJ how to get pixel rgb value?

Question

i have a simple plugin which saves the polygon coordinates:

Roi roi = imp.getRoi();
Polygon p = roi.getPolygon();
for (int i = 1; i <= p.npoints; i++) {
// létrehozzuk az onvif féle vector-t
org.onvif.ver10.schema.Vector myVector = new Vector();
myVector.setX((float) p.xpoints[i - 1]);
myVector.setY((float) p.ypoints[i - 1]);
op.getPoint().add(myVector);
// IJ.log("Vector X Elements " + i + " :" + MyVector.getX());

        }

but i want to get the coordinates rgb values like this: enter image description here

can you help me with this? Thank you!

And what about HU value for CT Image – Jay Thakkar Jun 12 '14 at 08:13 — Jay Thakkar, Jun 12 '14 at 08:13

score 2 · Accepted Answer · answered Apr 22 '13 at 15:17

2

Supposing the image is 32-bit RGB:

ImagePlus im = IJ.getImage();
ImageProcessor imp = im.getProcessor();

int[] rgb = new int[3];
imp.getPixel(X,Y,rgb);

IJ.log(Arrays.toString(rgb));

answered Apr 22 '13 at 15:17

Josef Borkovec

1,069
8
13

score 0 · Answer 2 · answered Apr 22 '13 at 15:16

int[] r;

        for (int i = 1; i <= p.npoints; i++) {

            r = imp.getPixel(p.xpoints[i - 1], p.ypoints[i - 1]);



            ij.IJ.log("Red: "+ r[0]);
            ij.IJ.log("Green: "+ r[1]);
            ij.IJ.log("Blue: "+ r[2]);
            ij.IJ.log("index: "+ r[3]);

        }

imageJ how to get pixel rgb value?

2 Answers2