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Pronunciation varies by accent · noun
(photography) A circular vignette-like defect where the image fades at the borders..
Use portholing when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Portholing means (photography) A circular vignette-like defect where the image fades at the borders..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use portholing where its definition matches the intended context.
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