i want to generate a gray-scale image from byte array,is it possible to do it with opencv ?

edit

sure that is possible, but you have to tell us, where your byte array comes from, and what is in it.

I have taken a gray-scale image and have read it using java .then have taken 8 bits for each pixel of the image.further on each of this pixel i have performed various functions in the end i have again taken the decimal value of this pixels in attempt to regenerate the image.But so far i am unsuccessful,so now how can i read the pixel value obtained to again reconstruct the image of same height and width. i am getting something like this[43 25 29 13 0 12 48 60 21 29 4 31 27 3 35 54 17 49 12 1 22 24 ]

not enough information. width ? height ? channels ? how long is you array ?

The image that i am getting using your solution is a noisy image.The input image i am taking is lena.png 256*256 grayscale image.I am not changing the pixels just trying to regenerate it.

//1. Convert Image to byte code 
    ImgDemo im = new ImgDemo();
    String path = "C:\\Users\\domin\\Desktop\\Sop\\MyImgOut.png";
    byte[] pixels = im.ByteConvert(path);

//2. Convert byte to image Mat img1 = new Mat(256,256, CvType.CV_8UC1);

    img1.put(0, 0, pixels);
     String filename = "C:\\Users\\domin\\Desktop\\Sop\\dreams.png";
     Highgui.imwrite(filename, img1);

@Ann162 , and ? what are you trying to say ?

also, why not simply use imread() to read the image ?

imread doesnot return the byte array of the image,which is required for further processing.