Enhance color processing in generate3d function by applying clipping and gamma correction

- Added clipping to ensure orig_colors are within the [0, 1] range.
- Implemented gamma correction to adjust color values for improved visual fidelity in the generated mesh.

inference.py

@@ -72,6 +72,8 @@ def generate3d(model, rgb, ccm, device):
         # Comment out the scaling below if orig_colors is already in [0, 1]
         # orig_colors = (orig_colors * 0.5 + 0.5).clip(0, 1)  # scale to [0, 1]
         print('orig_colors min/max AFTER scaling:', orig_colors.min(), orig_colors.max())
+        orig_colors = np.clip(orig_colors, 0, 1)
+        orig_colors = np.power(orig_colors, 1/2.2)
     verts, faces = clean_mesh(
         orig_verts.astype(np.float32),
         data_config['faces'].squeeze().cpu().numpy().astype(np.int32),