The --ar parameter sets the aspect ratio of your generated image — one of the most important parameters to get right.
Common Aspect Ratios
--ar 1:1— Square (social media posts)--ar 16:9— Widescreen (YouTube thumbnails, presentations)--ar 9:16— Portrait/vertical (Instagram Stories, TikTok)--ar 4:3— Classic photo format--ar 3:2— Standard photography--ar 2:3— Portrait photography, book covers
Usage
Add at the end of your prompt: a mountain landscape --ar 16:9
Reference:
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