CODEWITHSUNDEEP
javaimagebufferedimage
3ck
3ck

Reputation: 539

Array Index Out of Bounds when creating Buffered Image in Java

I am attempting to process an image file and return it as an Image object, however I am getting an ArrayIndexOutOfBoundsException in the following code when I call public static BufferedImage getImageFromArray(int[] data, int columns, int rows).

I have the following pixel colors stored into an array named "data":

[255,6,65,78,99,100,25,0,45,66,88,190,88,76,50]

I parsed this out from a text file that looked like this:

255, 6, 65, 78, 99
100, 25, 0, 45, 66
88, 190, 88, 76, 50

I am trying to generate an image from this data by using BufferedImage currently I am hitting a brick wall with this. Columns and rows are passed to this based on the table structure above.

    public static BufferedImage getImageFromArray(int[] data, int columns, int rows) {
    BufferedImage image = new BufferedImage(columns, rows, BufferedImage.TYPE_INT_RGB);
    WritableRaster raster = (WritableRaster) image.getData();
    raster.setPixels(0,0, columns, rows, data);
    image.setData(raster);
    return image;
}

I get an OOB exception when I hit the raster.setPixels call. Does this need a different array or value I am missing?

Upvotes: 0

Views: 2299

Answers (1)

3ck
3ck

Reputation: 539

Here is the solution I found, the type RGB requires 3 bands... therefore to create an array that works:

private int[] imageArray(String fullFilePath, int rows, int columns) throws Exception{
    int picRows = rows;
    int picColumns = columns;
    data = getPixelData(fullFilePath);

    //3 bands in TYPE_INT_RGB
    int NUM_BANDS = 3;
    int[] arrayImage = new int[picRows * picColumns * NUM_BANDS];

    for (int i = 0; i < picRows; i++)
    {
        for (int j = 0; j < picColumns; j++) {
            for (int band = 0; band < NUM_BANDS; band++)
                for (int k = 0; k < data.length; k++)
                    arrayImage[((i * picRows) + j)*NUM_BANDS + band] = data[k];
        }
    }
    return arrayImage;
}

Upvotes: 2

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