Allow higher max zoom for Big images

[will-moore]

See https://forum.image.sc/t/omero-iviewer-zoom-limits/39220

This allows higher zoom levels for big images.
To test, try zooming in on a big image. Should now be able to go to 644% (instead of 161%).

Also check that max zoom of non-Big images is unchanged at 4000% (Not sure if we should reduce this?).

[imagesc-bot]

This pull request has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/omero-iviewer-zoom-limits/39220/2

[AarghIMApiratez]

Hi Will,

Thanks for the quick response and starting a pull request.

This is purely from a user perspective. But I think it makes sense to allow more zoom for a larger images That is, regardless of an image's size you end up with pixels that are of the same size on your screen.

See my two images attached (Viewed without interpolate).
The two images are imaged at the same resolution / settings etc.

Small image A. allows 4000% zoom. Where pixels are huge. (~2 times my cursor height?)
Larger image B. allows 161% zoom (now changed by you to 322%). Here I can barely make them out.

In my view a good value would be 500% (image C). 322 might do the trick, but should be the same regardless of size.

Image A

Image B

Image C

Mind that I havent thought about if/how resolutions on different screens might affect what is reasonable.

Friendly regards, Staffan

[mtbc]

Zoom increased for big images, remains at 4000% for other.