I would like to convert a Bitmap to a grayscale array of bytes (one
byte per pixel). At the same time I want to just crop at section from
the middle. Having looked though the various api's it is not clear to
me what the best way would be.
The best way I have found in se java is as below;
BufferedImage image = new BufferedImage(cropWidth, cropHeight,
BufferedImage.TYPE_BYTE_GRAY);
Graphics g = image.getGraphics();
g.drawImage(colorImage, cropOffsetX, cropOffsetY, null);
g.dispose();
Leaving me with a graysale image of the right section;
What is the equivalent method with android api's. I am guessing it is
along these lines....
Bitmap bm = Bitmap.createBitmap(500, 500,
Bitmap.Config.ALPHA_8); // ALPHA_8?
Canvas c = new Canvas(bm);
Paint paint = new Paint(); // should something be set
here to get grayscale?
c.drawBitmap(bm, 200, 200, paint);
bm..getPixels(...); // I want byte/pixel not int/
pixel ??
However, I have two questions;
1) What is ALPHA_8? is that grayscale?
I have a feeling that the grayscale effect should be done via some
"saturation" on the paint object, right?
2) once I have the Bitmap in grayscale and the right size, what is the
best way to get that to a byte[] of pixels (one byte per pixel) ?
Thanks.
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