image - Java - Convert RAW to JPG/PNG -

i have image captured camera, in raw bgra format (byte array). how can save disk, jpg/png file?

i've tried imageio.write java api, got error illegalargumentexception (image = null)

code:

try {     inputstream input = new bytearrayinputstream(img);     bufferedimage bimagefromconvert = imageio.read(input);      string path = "d:/image.jpg";      imageio.write(bimagefromconvert, "jpg", new file(path)); } catch(exception ex) {     system.out.println(ex.tostring()); } 

note "img" raw byte array, , not null.

the problem imageio.read not support raw rgb (or bgra in case) pixels. expects file format, bmp, png or jpeg, etc.

in code above, causes bimagefromconvert become null, , reason error see.

if have byte array in bgra format, try this:

// need know width/height of image int width = ...; int height = ...;  int samplesperpixel = 4; int[] bandoffsets = {2, 1, 0, 3}; // bgra order  byte[] bgrapixeldata = new byte[width * height * samplesperpixel];  databuffer buffer = new databufferbyte(bgrapixeldata, bgrapixeldata.length); writableraster raster = raster.createinterleavedraster(buffer, width, height, samplesperpixel * width, samplesperpixel, bandoffsets, null);  colormodel colormodel = new componentcolormodel(colorspace.getinstance(colorspace.cs_srgb), true, false, transparency.translucent, databuffer.type_byte);  bufferedimage image = new bufferedimage(colormodel, raster, colormodel.isalphapremultiplied(), null);  system.out.println("image: " + image); // should print: image: bufferedimage@<hash>: type = 0 ...  imageio.write(image, "png", new file(path)); 

note jpeg not format storing images alpha channel. while possible, software not display properly. suggest using png instead.

alternatively, remove alpha channel, , use jpeg.