[Bug/Enhancement]: purple border around dicom image preview

[koebel]

Describe the bug

there is a purple border around the dicom image when it is displayed in original size. This seems to be standard for how cornerstone displays the images, see https://www.cornerstonejs.org/live-examples/stackbasic for example, but from a user perspective, this is not so nice.

Steps to reproduce

1. preview a dicom image

Expected behavior

when the zoom factor is 100%, there shouldn't be a thick purple border around the image. Ideally just a thin border or none.

Actual behavior

in the initial state and when the zoom factor is 100%, there is a thick purple border around the image.