I need to save a set of pre-processing images in matlab, resulting in grayscale images. The problem is the fact that these pre-processed images have pixel values higher than 255. If I save them with imwrite() as, for instance, .PNG files, does matlab normalize the values to be in [0,255] or no? should I have to save my images in another format to keep their original values?

Answer:

You can use the `bitdepth`

parameter to set that.

```
imwrite(img,'myimg.png','bitdepth',16)
```

Of course, not all image formats support all bitdepths, so make sure you are choosing the the right format for your data.

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