scale | Apple Developer Documentation

This value is a ratio of view points to image pixels. This relationship means that values greater than 1.0 create an image larger than the original content view, and less than 1.0 creates a smaller image. The following example shows a 100 x 50 rectangle view and an image rendered from it with a scale of 2.0, resulting in an image size of 200 x 100. The default value of this property is 1.0.

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• Chloe Yan