java - Obtain float[] or int[] from BufferedImage -

i trying use tone mapping code here. has function:

public void tonemap(final float[] image, final byte[] rgbout) {          (int = 0; < image.length; i++) {             final float clamped = math.max(0, math.min(1f, image[i]));             rgbout[i] = (byte) (0xff & (short) (clamped * 255.0));          }       } 

it takes in float array , byte array of images , applies simple clamping pixel values. tried:

int[]rbg=((databufferint) image.getraster().getdatabuffer()).getdata(); 

but got following exception:

java.lang.classcastexception: java.awt.image.databufferbyte cannot cast java.awt.image.databufferint 

other stackoverflow answers have explained why so.

i have image file want apply function file. know can read image bufferedimage using imageio.read(). how float[] rgb it? possible? or there other libraries available can me conversion image float[] rgb array of pixels?

edit:

as few people have mentioned in comments code above nothing pixel values in range of 0..255. want apply above code hdr images, .exr format image , have infinite range.