Calculate image, video, and screen dimensions with locked aspect ratios and standard format presets.
Aspect ratio is the proportional relationship between width (W) and height (H), expressed as W:H. To scale a height with a locked ratio: Height = (Width × Ratio_H) / Ratio_W.
The standard widescreen display aspect ratio is 16:9 (e.g., 1920×1080 for 1080p Full HD, 3840×2160 for 4K UHD).
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