Outpaint Stitch Pixaroma

Puts the pristine original image back onto an outpaint result, keeping only the part the model newly generated. Use it after Outpaint Pixaroma when you had to scale a large image down for the model: the original half comes back at full quality instead of the softened, downscaled version that went through the model. Wire the 'outpaint_info' output of Outpaint Pixaroma into 'outpaint_info' here, and the finished image (after VAE Decode) into 'image'. The node scales the result back up to the full padded size, drops the original back exactly where it was, and blends the join. 'feather' softens the seam between the original and the new area. The seam will not be perfectly invisible, because the new area was blended to a re-encoded copy of the original rather than the pristine one, so a little feather usually looks best. Only the edges next to the new area are softened; the real picture edges stay sharp. 'color match' fixes the colour/tone step you can sometimes see where the new area meets the original, by continuing the original's colour along the seam into the new area. It follows the background per region, so it evens out a light-wall / dark-floor scene, not only a single flat colour. 0 turns it off, 100 is a full match (the usual sweet spot), above 100 over-matches for the rare stubborn step. It only evens out tone, never texture or detail, so it cannot add artefacts. Outputs the recombined full-resolution image, plus a mask marking the newly generated area (white) versus the untouched original (black) - handy if you want to run a light refine pass on just the new part later.