CODEWITHSUNDEEP
javaimagegraphics
Ma99uS
Ma99uS

Reputation: 10931

How to convert array of bytes into Image in Java SE

What is the right way to convert raw array of bytes into Image in Java SE. array consist of bytes, where each three bytes represent one pixel, with each byte for corresponding RGB component.

Can anybody suggest a code sample?

Thanks, Mike

Upvotes: 7

Views: 10519

Answers (5)

Chong Yang
Chong Yang

Reputation: 96

Assuming that your raw data is a 1d array like:

byte[] imageBytes = new byte[1024];
// transform to bufferImage
BufferedImage bufferedImage = ImageIO.read(new ByteArrayInputStream(imageBytes));
// if you want to do some operations to the image, like resize, 
// use the lib (net.coobird.thumbnailator)
BufferedImage image = Thumbnails.of(bufferedImage).forceSize(WIDTH, HEIGHT)
                                .outputFormat("bmp").asBufferedImage();

Upvotes: 1

Aleksei Potapkin
Aleksei Potapkin

Reputation: 1096

You can do it using Raster class. It's better because it does not require iterating and copying of byte arrays.

 byte[] raw = new byte[width*height*3]; // raw bytes of our image
 DataBuffer buffer = new DataBufferByte(raw, raw.length);

 //The most difficult part of awt api for me to learn
 SampleModel sampleModel = new ComponentSampleModel(DataBuffer.TYPE_BYTE, width, height, 3, width*3, new int[]{2,1,0});

 Raster raster = Raster.createRaster(sampleModel, buffer, null);

 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
 image.setData(raster);

Upvotes: 10

Mutant Bob
Mutant Bob

Reputation: 3549

folkyatina's approach works if your RGB values are in B,G,R order, but if they are in R,G,B order I have found the following code to work:

    DataBuffer rgbData = new DataBufferByte(rgbs, rgbs.length);

    WritableRaster raster = Raster.createInterleavedRaster(
        rgbData, width, height,
        width * 3, // scanlineStride
        3, // pixelStride
        new int[]{0, 1, 2}, // bandOffsets
        null);

    ColorModel colorModel = new ComponentColorModel(
        ColorSpace.getInstance(ColorSpace.CS_sRGB),
        new int[]{8, 8, 8}, // bits
        false, // hasAlpha
        false, // isPreMultiplied
        ComponentColorModel.OPAQUE,
        DataBuffer.TYPE_BYTE);

    return new BufferedImage(colorModel, raster, false, null);

Upvotes: 2

akarnokd
akarnokd

Reputation: 69997

There is a setRGB variant which accepts an int array of RGBA values:

BufferedImage img=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
int[] raw = new int[data.length * 4 / 3];
for (int i = 0; i < data.length / 3; i++) {
    raw[i] = 0xFF000000 | 
        ((data[3 * i + 0] & 0xFF) << 16) |
        ((data[3 * i + 1] & 0xFF) << 8) |
        ((data[3 * i + 2] & 0xFF));
}
img.setRGB(0, 0, width, height, raw, 0, width);

The performance characteristics is similar to CoderTao's solution.

Upvotes: 1

CoderTao
CoderTao

Reputation: 3991

Assuming you know the height and width of the image.

BufferedImage img=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for(int r=0; r<height; r++)
for(int c=0; c<width; c++)
{
  int index=r*width+c;
  int red=colors[index] & 0xFF;
  int green=colors[index+1] & 0xFF;
  int blue=colors[index+2] & 0xFF;
  int rgb = (red << 16) | (green << 8) | blue;
  img.setRGB(c, r, rgb);
}

Roughly. This assumes the pixel data is encoded as a set of rows; and that the length of colors is 3 * width * height (which should be valid).

Upvotes: 6

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