How can I convert a short[] into a int[] to create a grayscale bitmap?

I am trying to run a denoising algorithm on a bitmap image that I have -- the function returns me a short[], so I tried simply casting it to int[] in order to generate a bitmap and I get this:

I'd like it to be in grayscale,开发者_运维知识库 not .. well.. pink. Any ideas?

Instead of replicating the 8-bit intensity in each of the RGB channels, you can use the intensity as the alpha channel. In this scheme, 0 corresponds to transparent (background color) and 255 corresponds to fully opaque (black, or whatever color you want--even pink). The idea is similar to Jason LeBrun's proposal: take the high-order 8 bits of each value, shift 24 bits left, then bitwise-OR with the color you want to use for full intensity (or with nothing, if you want black to represent full intensity).

The pixels of a bitmap are encoded using either ARGB_8888, RGB_565, ARGB_4444, or ALPHA_8. So, the short values that you're returning must happen to correspond to values that look slightly pink-ish in one of those formats.

If you want a grayscale bitmap, you can only have values in the range of 0-256 (For the maximum precious color component of 8 bits if you're using ARGB_8888). So, you'll need to map your short to values within that range, and then replicate that value for each of the RGB components.