tweaks to make postprocess fixing work better

- modify strength of embiggen to reduce tiling ghosts
- normalize naming of postprocessed files (could improve more to avoid
name collisions)
- move restoration modules under ldm.dream

docs/features/EMBIGGEN.md

@@ -55,7 +55,6 @@ and it can also be less than one if the init_img is too big.
 Esrgan_strength defaults to 0.75, and the overlap_ratio defaults to
 0.25, both are optional.
 
-
 Unlike Img2Img, the `--width` (`-W`) and `--height` (`-H`) arguments
 do not control the size of the image as a whole, but the size of the
 tiles used to Embiggen the image.

ldm/dream/generator/embiggen.py

@@ -62,6 +62,9 @@ class Embiggen(Generator):
             embiggen_tiles = list(map(lambda n: n-1, embiggen_tiles))
             embiggen_tiles.sort()
 
+        if strength >= 0.5:
+            print(f'* WARNING: Embiggen may produce mirror motifs if the strength (-f) is too high (currently {strength}). Try values between 0.35-0.45.')
+
         # Prep img2img generator, since we wrap over it
         gen_img2img = Img2Img(self.model)
 

ldm/generate.py

@@ -510,6 +510,8 @@ class Generate:
                 skip_normalize=opt.skip_normalize,
                 log_tokens    =opt.log_tokenization
             )
+            opt.strength  = 0.40
+            print(f'>> Setting img2img strength to {opt.strength} for happy embiggening')
             # embiggen takes a image path (sigh)
             generator.generate(
                 prompt,

scripts/dream.py

@@ -243,9 +243,9 @@ def main_loop(gen, opt, infile):
         # Here is where the images are actually generated!
         last_results = []
         try:
-            file_writer = PngWriter(current_outdir)
-            prefix = file_writer.unique_prefix()
-            results = []  # list of filename, prompt pairs
+            file_writer      = PngWriter(current_outdir)
+            prefix           = file_writer.unique_prefix()
+            results          = []  # list of filename, prompt pairs
             grid_images      = dict()  # seed -> Image, only used if `opt.grid`
             prior_variations = opt.with_variations or []
             first_seed       = opt.seed
@@ -257,7 +257,9 @@ def main_loop(gen, opt, infile):
                 if opt.grid:
                     grid_images[seed] = image
                 else:
-                    if upscaled and opt.save_original:
+                    if operation == 'postprocess':
+                        filename = choose_postprocess_name(opt.prompt)
+                    elif upscaled and opt.save_original:
                         filename = f'{prefix}.{seed}.postprocessed.png'
                     else:
                         filename = f'{prefix}.{seed}.png'
@@ -268,6 +270,8 @@ def main_loop(gen, opt, infile):
                         formatted_dream_prompt = opt.dream_prompt_str(seed=first_seed)
                     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)
                     else:
                         formatted_dream_prompt = opt.dream_prompt_str(seed=seed)
                     path = file_writer.save_image_and_prompt_to_png(
@@ -353,6 +357,18 @@ def do_postprocess (gen, opt, callback):
         opt                 = opt,
         )
     
+def choose_postprocess_name(original_filename):
+    basename,_ = os.path.splitext(os.path.basename(original_filename))
+    if re.search('\d+\.\d+$',basename):
+        return f'{basename}.fixed.png'
+    match = re.search('(\d+\.\d+)\.fixed(-(\d+))?$',basename) 
+    if match:
+        counter  = match.group(3) or 0
+        return '{prefix}-{counter:02d}.png'.format(prefix=match.group(1), counter=int(counter)+1)
+    else:
+        return f'{basename}.fixed.png'
+        
+
 def get_next_command(infile=None) -> str:  # command string
     if infile is None:
         command = input('dream> ')