AI image editing trial / KI-Bildversuch, 10.10.2026
Tool: Codex built-in image tool; exact model/version not reported.
One generated original, one edit, no retries.

Edit prompt (verbatim except straight/curly punctuation):
Change only the ceramic mug from cobalt blue to warm red. Keep the mug’s shape, handle, coffee, reflections and shadow unchanged. Preserve the yellow notebook, black elastic strap, basil leaves, terracotta pot, wooden table grain, window, wall, lighting, viewpoint, crop, dimensions and positions exactly as in the input. Do not add or remove anything. Return a single edited photograph with no labels or layout. This is a controlled image edit experiment, so prioritize preservation of everything outside the mug.

Original files: 1536x1024 PNG; local editorial originals retained. Display copies are WebP.
Observation: red mug; object arrangement visually retained. Outside generous mug rectangle x=130..649, y=410..849: mean absolute RGB channel difference 3.4444/255. Only about 0.736% of outside pixels identical in all channels. This is not a semantic similarity score; reconstruction/encoding differences can change pixels without changing objects.
No human subjects, no real workspace, no free-plan comparison.