Wierd Screen Shot Problem, texture of screen shot looks different in editor and in system.

Hello, I have run into a very strange problem. I am taking screenshot of certain area of the screen using the following code.

IEnumerator Save() { camera.enabled = true; //camera.targetTexture = new RenderTexture(512,512,24,RenderTextureFormat.ARGB32,RenderTextureReadWrite.sRGB);

     originalSide = Manager._instance.side;
     
     Manager._instance.side = 1;
     _shirtHandler.LoadPattern();
     
     //camera.Render();
     //yield return new WaitForEndOfFrame();
     RenderTexture.active = camera.targetTexture;
     Texture2D texFront = new Texture2D(camera.targetTexture.width,camera.targetTexture.height,TextureFormat.ARGB32,false );
     texFront.ReadPixels(new Rect(0,0,512,512), 0, 0);
     texFront.Apply();
     
     yield return null;
     Manager._instance.side = 1;
     _shirtHandler.LoadPattern();
     
     //camera.Render();
     //yield return new WaitForEndOfFrame();
     RenderTexture.active = camera.targetTexture;
     Texture2D texBack = new Texture2D(camera.targetTexture.width,camera.targetTexture.height,TextureFormat.ARGB32,false );

     texBack.ReadPixels(new Rect(0,0,512,512), 0, 0);
     texBack.Apply();
     Manager._instance.isSaving = false;
     
     //temp.material.mainTexture = texFront;
     camera.enabled=false;
     yield return null;
     //upload it to server..
     byte[] bytesFront= texFront.EncodeToPNG();
     File.WriteAllBytes("C:/Users/Vijay/Desktop/Front.png", bytesFront );
     File.WriteAllBytes("C:/Users/Vijay/Desktop/Back.png", texBack.EncodeToPNG());
     
     Manager._instance.side = originalSide;
     _shirtHandler.LoadPattern();
 }

There are two cameras in game. one is the main camera and another one is only for the purpose of saving the screen shot of certain area of screen. I am enabling the camera at the time of capturing alone. I am getting the screenshot as per my requirement but only until i save it to local... when I apply the captured screenshot to a material in game it is working fine but whn i save the screen shot, I could hardly see the colors in there. and when i import the saved screen shot into unity, it is looking normal. But every where else except unity im seeing an image without much colors...I am attaching both the versions in this mail...

The saved screenshot

The above might look like empty image but has colors in it, whn zoomed a bit.

The same file after importing to unity,

Could someone tell me why this is happening??