Distinguish transparent and flattened sources before judging edges

transparent.png and white-background.png are both 600×400 with the same subject. The first has transparent corners; the second has real white pixels. A light gray edge exposes halos and over-removal.

1. Export both as PNG while preserving the original background. Inspect corners and subject edges. After every change to batch format, background or watermark settings, click Apply settings & preview and wait for all outputs to finish before downloading.

2. View each on dark and white backgrounds. A white viewer backdrop alone does not establish white image pixels.

3. For background removal from the flattened copy, work on one separate input and inspect the pale edge, holes and corners before replacing a delivery file.

Background preservation should retain transparency from the transparent source and white pixels from the flattened one. Matching format settings are not automatic background removal. A removed-background output must also pass subject-edge review.

If pale subject detail disappears, retain the failed copy and revise the method or use a manual mask from the original. Repeated lossy JPEG intermediates add background and edge changes instead of recovering lost detail.
