320 × 568 375 × 667 1125 × 2001 4.7″ 5.5″ The device screen may have lower pixel resolution than the image rendered in previous step. Before the image can be displayed, it must be downsampled (resized) to lower pixel resolution.
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The Ultimate Guide To iPhone Resolutions
320 × 568 375 × 667 1125 × 2001 4.7″ 5.5″ The device screen may have lower pixel resolution than the image rendered in previous step. Before the image can be displayed, it must be downsampled (resized) to lower pixel resolution.
Full article