enhance outcropping with ability to direct contents of new regions

- When outcropping an image you can now add a `--new_prompt` option, to specify
  a new prompt to be used instead of the original one used to generate the image.

- Similarly you can provide a new seed using `--seed` (or `-S`). A seed of zero
  will pick one randomly.

- This PR also fixes the crash that happened when trying to outcrop an image
  that does not contain InvokeAI metadata.

docs/features/OUTPAINTING.md

@@ -92,6 +92,21 @@ The new image is larger than the original (576x704) because 64 pixels were added
 to the top and right sides. You will need enough VRAM to process an image of
 this size.
 
+#### Outcropping non-InvokeAI images
+
+You can outcrop an arbitrary image that was not generated by InvokeAI,
+but your results will vary. The `inpainting-1.5` model is highly
+recommended, but if not feasible, then you may be able to improve the
+output by conditioning the outcropping with a text prompt that
+describes the scene using the `--new_prompt` argument:
+
+```bash
+invoke> !fix images/vacation.png --outcrop top 128 --new_prompt "family vacation"
+```
+
+You may also provide a different seed for outcropping to use by passing
+`-S<seed>`. A seed of "0" will generate a new random seed.
+
 A number of caveats:
 
 1. Although you can specify any pixel values, they will be rounded up to the

ldm/generate.py

@@ -561,18 +561,22 @@ class Generate:
             ):
         # retrieve the seed from the image;
         seed   = None
-        image_metadata = None
         prompt = None
 
         args   = metadata_from_png(image_path)
-        seed   = args.seed
-        prompt = args.prompt or ''
-        if seed == 0:
-            seed = random.randrange(0, np.iinfo(np.uint32).max)
-            opt.seed = seed
-            print(f'>> generated new seed {seed} and prompt "{prompt}" for {image_path}')
+        if opt.seed is not None:
+            seed = opt.seed
+        elif args.seed >= 0:
+            seed = args.seed
         else:
-            print(f'>> retrieved seed {seed} and prompt "{prompt}" from {image_path}')
+            seed   = random.randrange(0, np.iinfo(np.uint32).max)
+
+        if opt.prompt is not None:
+            prompt = opt.prompt
+        else:
+            prompt = args.prompt
+
+        print(f'>> using seed {seed} and prompt "{prompt}" for {image_path}')
 
         # try to reuse the same filename prefix as the original file.
         # we take everything up to the first period
@@ -619,6 +623,10 @@ class Generate:
                     extend_instructions[direction]=int(pixels)
                 except ValueError:
                     print(f'** invalid extension instruction. Use <directions> <pixels>..., as in "top 64 left 128 right 64 bottom 64"')
+
+            opt.seed = seed
+            opt.prompt = prompt
+            
             if len(extend_instructions)>0:
                 restorer = Outcrop(image,self,)
                 return restorer.process (

ldm/invoke/args.py

@@ -864,6 +864,11 @@ class Args(object):
             default=32,
             help='When outpainting, the tile size to use for filling outpaint areas',
         )
+        postprocessing_group.add_argument(
+            '--new_prompt',
+            type=str,
+            help='Change the text prompt applied during postprocessing (default, use original generation prompt)',
+        )
         postprocessing_group.add_argument(
             '-ft',
             '--facetool',

ldm/invoke/restoration/outcrop.py

@@ -32,8 +32,8 @@ class Outcrop(object):
             image_callback(img,preferred_seed,use_prefix=prefix,**kwargs)
 
         result= self.generate.prompt2image(
-            orig_opt.prompt,
-            seed        = orig_opt.seed if orig_opt.seed>0 else opt.seed,
+            opt.prompt,
+            seed        = opt.seed if opt.seed else orig_opt.seed,
             sampler     = self.generate.sampler,
             steps       = opt.steps,
             cfg_scale   = opt.cfg_scale,

scripts/invoke.py

@@ -277,7 +277,7 @@ def main_loop(gen, opt):
                     filename = f'{prefix}.{use_prefix}.{seed}.png'
                     tm = opt.text_mask[0]
                     th = opt.text_mask[1] if len(opt.text_mask)>1 else 0.5
-                    formatted_dream_prompt = f'!mask {opt.prompt} -tm {tm} {th}'
+                    formatted_dream_prompt = f'!mask {opt.input_file_path} -tm {tm} {th}'
                     path = file_writer.save_image_and_prompt_to_png(
                         image           = image,
                         dream_prompt    = formatted_dream_prompt,
@@ -317,7 +317,7 @@ def main_loop(gen, opt):
                         tool = re.match('postprocess:(\w+)',opt.last_operation).groups()[0]
                         add_postprocessing_to_metadata(
                             opt,
-                            opt.prompt,
+                            opt.input_file_path,
                             filename,
                             tool,
                             formatted_dream_prompt,
@@ -614,10 +614,16 @@ def do_textmask(gen, opt, callback):
     )
 
 def do_postprocess (gen, opt, callback):
-    file_path = opt.prompt     # treat the prompt as the file pathname
+    file_path = opt.prompt      # treat the prompt as the file pathname
+    if opt.new_prompt is not None:
+        opt.prompt = opt.new_prompt
+    else:
+        opt.prompt = None
+        
     if os.path.dirname(file_path) == '': #basename given
         file_path = os.path.join(opt.outdir,file_path)
 
+    opt.input_file_path = file_path
     tool=None
     if opt.facetool_strength > 0:
         tool = opt.facetool
@@ -707,7 +713,7 @@ def prepare_image_metadata(
     elif len(prior_variations) > 0:
         formatted_dream_prompt = opt.dream_prompt_str(seed=first_seed)
     elif operation == 'postprocess':
-        formatted_dream_prompt = '!fix '+opt.dream_prompt_str(seed=seed)
+        formatted_dream_prompt = '!fix '+opt.dream_prompt_str(seed=seed,prompt=opt.input_file_path)
     else:
         formatted_dream_prompt = opt.dream_prompt_str(seed=seed)
     return filename,formatted_dream_prompt