Image Transforms not stretching image
Before you run your transform, you can check the width of the asset file and adjust your transform as needed.

{% set thumb = {
    mode: 'scale',
    width: 1000,
    quality: 70,
} %}

{% if asset.width &lt; 1000 %}

    {% set thumb = {
        mode: 'scale',
        width: asset.width,
        quality: 70,
    } %}

{% endif %}