diff --git a/examples/elephant_mask.png b/examples/elephant_mask.png
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index 0000000..50f25b2
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diff --git a/examples/pile_mask.png b/examples/pile_mask.png
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diff --git a/examples/pile_top_mask.png b/examples/pile_top_mask.png
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diff --git a/region_based.py b/region_based.py
old mode 100644
new mode 100755
index f512839..c0a347f
--- a/region_based.py
+++ b/region_based.py
@@ -10,7 +10,7 @@
 import argparse
 import numpy as np
 from PIL import Image
-
+from tqdm import tqdm
 
 def seed_everything(seed):
     torch.manual_seed(seed)
@@ -115,7 +115,7 @@ def generate(self, masks, prompts, negative_prompts='', height=512, width=2048,
         text_embeds = self.get_text_embeds(prompts, negative_prompts)  # [2 * len(prompts), 77, 768]
 
         # Define panorama grid and get views
-        latent = torch.randn((1, self.unet.in_channels, height // 8, width // 8), device=self.device)
+        latent = torch.randn((1, self.unet.config.in_channels, height // 8, width // 8), device=self.device)
         noise = latent.clone().repeat(len(prompts) - 1, 1, 1, 1)
         views = get_views(height, width)
         count = torch.zeros_like(latent)
@@ -124,7 +124,7 @@ def generate(self, masks, prompts, negative_prompts='', height=512, width=2048,
         self.scheduler.set_timesteps(num_inference_steps)
 
         with torch.autocast('cuda'):
-            for i, t in enumerate(self.scheduler.timesteps):
+            for i, t in enumerate(tqdm(self.scheduler.timesteps)):
                 count.zero_()
                 value.zero_()
 
@@ -175,20 +175,20 @@ def preprocess_mask(mask_path, h, w, device):
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
-    parser.add_argument('--mask_paths', type=list)
+    parser.add_argument('--bg_prompt', type=str, default='blurred image')
+    parser.add_argument('--bg_negative', type=str, default='')  # 'artifacts, blurry, smooth texture, bad quality, distortions, unrealistic, distorted image'
+    parser.add_argument('--fg_prompts', nargs='*', type=str, required=True, help='one ore more prompts for masks')
+    parser.add_argument('--fg_negative', nargs='*', type=str, help='optional negative prompts for masks', default=None)
+    parser.add_argument('--fg_masks', nargs='*', type=str, required=True, help='one or more paths to mask images')
     # important: it is necessary that SD output high-quality images for the bg/fg prompts.
-    parser.add_argument('--bg_prompt', type=str)
-    parser.add_argument('--bg_negative', type=str)  # 'artifacts, blurry, smooth texture, bad quality, distortions, unrealistic, distorted image'
-    parser.add_argument('--fg_prompts', type=list)
-    parser.add_argument('--fg_negative', type=list)  # 'artifacts, blurry, smooth texture, bad quality, distortions, unrealistic, distorted image'
-    parser.add_argument('--sd_version', type=str, default='2.0', choices=['1.5', '2.0'],
-                        help="stable diffusion version")
+    parser.add_argument('--sd_version', type=str, default='2.0', choices=['1.5', '2.0'], help="stable diffusion version")
     parser.add_argument('--H', type=int, default=768)
     parser.add_argument('--W', type=int, default=512)
     parser.add_argument('--seed', type=int, default=0)
     parser.add_argument('--steps', type=int, default=50)
-    # bootstrapping encourages high fidelity to tight masks, the value can be lowered is most cases
+    # bootstrapping encourages high fidelity to tight masks, the value can be lowered in most cases
     parser.add_argument('--bootstrapping', type=int, default=20)
+    parser.add_argument('--outfile', type=str, default='out.png')
     opt = parser.parse_args()
 
     seed_everything(opt.seed)
@@ -197,15 +197,18 @@ def preprocess_mask(mask_path, h, w, device):
 
     sd = MultiDiffusion(device, opt.sd_version)
 
-    fg_masks = torch.cat([preprocess_mask(mask_path, opt.H // 8, opt.W // 8, device) for mask_path in opt.mask_paths])
+    fg_masks = torch.cat([preprocess_mask(mask_path, opt.H // 8, opt.W // 8, device) for mask_path in opt.fg_masks])
     bg_mask = 1 - torch.sum(fg_masks, dim=0, keepdim=True)
     bg_mask[bg_mask < 0] = 0
     masks = torch.cat([bg_mask, fg_masks])
 
+    # fill in optional negative prompts if none given
+    if opt.fg_negative is None:
+        opt.fg_negative = ['' for _ in opt.fg_prompts]
     prompts = [opt.bg_prompt] + opt.fg_prompts
     neg_prompts = [opt.bg_negative] + opt.fg_negative
 
     img = sd.generate(masks, prompts, neg_prompts, opt.H, opt.W, opt.steps, bootstrapping=opt.bootstrapping)
 
     # save image
-    img.save('out.png')
\ No newline at end of file
+    img.save(opt.outfile)