Allows you to check the document for images that have been scaled non-proportionally (optionally allowing a slight deviation).
Proportional scaling reduces the size of the image by an equal percentage along both the X- and the Y-axis. If an image is scaled non-proportionally, the proportions between height and length of the image are changed, resulting in distortions in the image.
You may allow scaling if the distortion is smaller than a specific value. Very small distortions to the image may not be visually detectable.
No automatic fix provided