Java for ImageJ. How to convert an image from RGB to 8 bit using code?

Question

I am currently working on Connected Component Labelling. This is a process which takes an image and tells you how many separate objects are in the Image. My problem is that at the very start I need to be able to take any image (specifically RGB value) and convert it into 8-bit. EDIT: as in literally considered an 8bit, where the image is no longer recognised as RGB. Not an 8bit image that is recognised as an RGB. Is there a way using code to automatically do this without having to go into the toolbar and convert it "manually"? To clarify, I am programming for ImageJ using Java. If anyone is willing to help me, I would be happy to provide them with the code I have so far where I am making a coloured image grey scale and then making it binary. My problem is that after the changes the image is still considered RGB, even though the image is essentially 8 bit. Thanks EDIT: I was looking at the code provided to me earlier and it doesn't seem to solve my problem. I am quite literally just wa…

Accepted Answer

Please try:

```
import ij.ImagePlus;
import ij.process.ImageConverter;

// ...

ImagePlus imp = IJ.getImage();
ImageConverter ic = new ImageConverter(imp);
ic.convertToGray8();
imp.updateAndDraw();
```

Java for ImageJ. How to convert an image from RGB to 8 bit using code?

Solution

Problem