A visible watermark is a composition choice, not a universal formula. Higher opacity and larger text improve recognition but cover more source pixels. Rotation can distinguish the label from horizontal content, yet a diagonal line may cross more of the image. WatermarkLocal exposes the exact values instead of claiming an automatic best setting.
Colour depends on the pixels below
White text may disappear over a bright sky and dark text over a shadow. Inspect the complete preview at more than one scale. This first release deliberately provides one solid colour without shadow or outline, so choose a position whose local contrast remains readable.
Visibility is not protection
Opacity does not measure security. Even a prominent visible mark can be cropped, covered or edited, while a subtle mark can help attribution without dominating an ordinary preview. Choose for the publishing purpose and keep original files separately.
Keep a visible watermark in its proper scope
WatermarkLocal creates a newly encoded Canvas image. A visible text mark can be cropped, covered, edited or removed and does not prove copyright, ownership, consent, authenticity or tamper resistance. Use it for ordinary digital publishing only. Do not prepare identity, medical, legal, evidentiary, inspection, emergency, navigation or other safety-critical imagery, and independently verify every important result.