I just came across a smart tipp how to resize (not compress) an image of a BLOB in an IR.
In the page properties under CSS- inline
just put
img {
width: 100px;
height: 100px;
}
and adjust the pixel size and you are done:
thanks to Rex Araya https://apex.rexaraya.com/resize-image-in-apex-interactive-report/
and "Learning a'peks"