## Altering intensity levels within an image

### mona (view profile)

on 8 Feb 2013

I would like to know with a black and white image of bit depth 8 (0-255 tones), how could I divide this range of 0-255 into two or more range for the purpose of decreasing the intensity levels of an image in Matlab? For instance, if a pixel has the intensity 192, how could I possibly bring it down to 2 by dividing the range of 0-255?

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### Image Analyst (view profile)

on 8 Feb 2013

Simply divide by 2:

```yourImage = uint8(yourImage / 2);
```

I have no idea what you are thinking with respect to having two or more ranges. You have only one range 0-255 and images can take any value in that range.

### Youssef Khmou (view profile)

on 8 Feb 2013

hi, you can use the function :

` J = imadjust(I,[low_in; high_in],[low_out; high_out],gamma)`

for an example see :

` doc imadjust`

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