Java Image byte array size

Question

I am trying to print bitmap image. In order to print image my printer needs byte array of bitmap. Picture size is 128x128 pixel.

Here is code how I read and convert image to byte array.

BufferedImage image = ImageIO.read(new File("test.bmp"));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, "bmp", baos);
byte[] imageInByte = baos.toByteArray();
System.out.println(imageInByte.length);

After code execution imageInByte array length is 2110. What am I missing here? Should not array length be 16384 (128 x 128)?

lance-java · Accepted Answer · 2016-02-24 11:09:47Z

1

You are assuming one byte per pixel and no header information. The "bitsPerPixel" header will play a large part in determining how much space the image data takes up. See the structure of a bitmap file here.

answered Feb 24, 2016 at 11:09

lance-java

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