EndcodeToPNG resulting in dark image

I'm working on a project that involves players taking screenshots with an in-game camera.

After some digging, the approach I decided to go with involves using a render texture, reading it's pixels and saving the result as a PNG. The issue I'm having is that the images all end up darker or more washed out than what I see when I run the project.

My first guess was that it had to do with the color format, but both the render texture and texture format for the Texture2D are ARGB32.

 public IEnumerator SaveCameraView()
     {
         yield return new WaitForEndOfFrame();
 
         RenderTexture rendText= RenderTexture.active;
         RenderTexture.active = screenShotCam.targetTexture;
 
         screenShotCam.Render();
 
         
         Texture2D cameraImage= new Texture2D(screenShotCam.targetTexture.width, screenShotCam.targetTexture.height, TextureFormat.ARGB32, false);
         cameraImage.ReadPixels(new Rect(0, 0, screenShotCam.targetTexture.width, screenShotCam.targetTexture.height), 0, 0);
         cameraImage.Apply();
         RenderTexture.active = rendText;
 
         // store the texture into a .PNG file
         byte[] bytes = cameraImage.EncodeToPNG();
 


         imageNum++;
         print (Application.dataPath);
         File.WriteAllBytes(Application.dataPath + "/Screenshots/shot"+imageNum+".png" , bytes);
 
     }    

I'm thinking it might have something to do with the alpha channel, since the images look quite different depending on what I use to open them, but I'm not sure how to proceed.

Any help would be hugely appreciated. Thanks!