Legacy Aspect Ratios
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    Legacy Aspect Ratios

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    Article Summary

    The --aspect or --ar parameter changes the aspect ratio of the generated image. An aspect ratio is the width-to-height ratio of an image. It is typically expressed as two numbers separated by a colon, such as 7:4 or 4:3.

    Read about the aspect ratios for the latest Midjourney Models here

    A square image has equal width and height, described as a 1:1 aspect ratio. The image could be 1000px × 1000px, or 1500px × 1500px, and the aspect ratio would still be 1:1. A computer screen might have a ratio of 16:10. The width is 1.6 times longer than the height. So the image could be 1600px × 1000px, 4000px × 2000px, 320px x 200px, etc.

    The default aspect ratio is 1:1.
    --aspect must use whole numbers. Use 139:100 instead of 1.39:1.
    The aspect ratio impacts the shape and composition of a generated image.
    Some aspect ratios may be slightly changed when upscaling.

    Legacy Max Aspect Ratios

    Different Midjourney Version Models have different maximum aspect ratios.

    Version 5Version 4c (default)Version 4a or 4bVersion 3Test / Testpniji 4niji 5
    Ratiosany*1:2 to 2:1Only: 1:1, 2:3 or 3:25:2 to2:53:2 to 2:31:2 to 2:1any*

    The --ar parameter will accept any aspect ratio from 1:1 (square) up to the maximum aspect ratio for each model. However, final outputs may be slightly modified during image generation or upscaling. Example: prompts using --ar 16:9 (1.78) create images with a 7:4 (1.75) aspect ratio.

    * Aspect ratios greater than 2:1 are experimental and may produce unpredicatble results.

    Comparison of common Midjourney Aspect Ratios

    prompt example: imagine/ prompt vibrant california poppies --ar 5:4

    How to Change the Aspect Ratio

    Use Aspect Ratio Parameters

    Add --aspect <value>:<value>, or --ar <value>:<value> to the end of your prompt.
    Animated Gif showing how the Midjourney version parameter is typed