I am trying to fetch a thumbnail image from DNG RAW image file and show it in android. I have successfully read all the required tags and get the values to form an image. But I haven't worked with image before so facing problem with bitmap creation. By reading the raw image tags I have got the below values:
image width = 320
image height = 216
compression = 1 (1=uncompressed)
sample Per Pixel = 3
bit Per Sample = 8
image start offset = 7044
color Interpretation = 2 (2=ARGB_8888)
to fetch the image data my code is:
int uBitsPerPixel = samplePerPixel * bitPerSample;
int lengthOfBitmap = imageLength * imageWidth * uBitsPerPixel/8;//size of image data
InputStream fis = new FileInputStream(file);
byte[] img = new byte[lengthOfBitmap];
fis.skip(startOffset);//image data starting position
fis.read(img, 0, lengthOfBitmap);
fis.close();
from the above code I am getting a byte arry of uncompressed image data. But I am convering it into a bitmap, getting bitmap as null.
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;
bitmap = BitmapFactory.decodeStream(inputStream, null, bmpFactoryOptions);
So, how can I create a bitmap properly? Advance thanks for any help.
