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JavaFX Image from a byte array
import javafx.scene.image.Image;
import javax.imageio.ImageIO;
import java.awt.image.*;
public Image getJavaFXImage(byte[] rawPixels, int width, int height) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
ImageIO.write((RenderedImage) createBufferedImage(rawPixels, width, height), "png", out);
} catch (IOException ex) {
Logger.getLogger(ImageUtils.class.getName()).log(Level.SEVERE, null, ex);
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
return new javafx.scene.image.Image(in);
private BufferedImage createBufferedImage(byte[] pixels, int width, int height) {
SampleModel sm = getIndexSampleModel(width, height);
DataBuffer db = new DataBufferByte(pixels, width*height, 0);
WritableRaster raster = Raster.createWritableRaster(sm, db, null);
IndexColorModel cm = getDefaultColorModel();
BufferedImage image = new BufferedImage(cm, raster, false, null);
return java.awt.image;
private SampleModel getIndexSampleModel(int width, int height) {
IndexColorModel icm = getDefaultColorModel();
WritableRaster wr = icm.createCompatibleWritableRaster(1, 1);
SampleModel sampleModel = wr.getSampleModel();
sampleModel = sampleModel.createCompatibleSampleModel(width, height);
return sampleModel;
private IndexColorModel getDefaultColorModel() {
byte[] r = new byte[256];
byte[] g = new byte[256];
byte[] b = new byte[256];
for(int i=0; i<256; i++) {
IndexColorModel defaultColorModel = new IndexColorModel(8, 256, r, g, b);
return defaultColorModel;
public void findMinAndMax(short[] pixels, int width, int height) {
int size = width*height;
int value;
min = 65535;
max = 0;
for (int i=0; i<size; i++) {
value = pixels[i]&0xffff;
if (value<min)
min = value;
if (value>max)
max = value;
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jamesthompson commented Aug 13, 2012

How to create a JavaFX Image from a byte array. A gist showing the general method.

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castmart commented Oct 30, 2012

Is it possible to identify the image's width and height directly from the file?

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ricemery commented Dec 3, 2012

Thanks. This was helpful... One comment, the IndexColorModel is getting built twice. Probably not a huge deal, but easy to optimize away.
Thanks again.

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taylorthurlow commented Dec 12, 2013

Line 25 has return java.awt.image' which I haven't seen before... I assume we just needreturn image` in it's place?

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gogomarine commented Jan 30, 2015

Nice tool.

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saudraisn commented Mar 19, 2018

+1 for @taylorthurlow comment! Very helpful, thanks!

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PrincewillIroka commented Jul 10, 2018

This resource was very useful to me. Thanks.

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helospark commented Sep 9, 2018

If performance is important (ex. to display animation), I suggest to use:

javafx.embed.swing.SwingFXUtils.toFXImage(bufferedImage, null)

On my machine it is about 6 times faster than rendering image to a png then parsing that with JavaFX.

An even faster solution that avoids the intermediary BufferedImage is:

ByteBuffer bgraPixels = convertToBgra(rawPixels); // convert your byte[] array into a ByteBuffer in bgra format.
Image img = new WritableImage(new PixelBuffer<>(width, height, bgraImage, WritablePixelFormat.getByteBgraPreInstance()));

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Precival commented Jan 28, 2019

Good job! Thanks :D

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