image thumbnail size

I am looking for a solution for this as well. I would prefer a thumbnail width of 150 or 200 pixels. When I try to do this with the ImageManager plugin, it distorts the thumbnail so that it is unusable.

Is there a way to do this with either ImageManager or with the default WordPress thumbnail generation?

Help is greatly appreciated.

And I just found a solution, though it is messy because it will require editing with each WordPress upgrade:

https://www.mediabaron.com/blog/2007/10/30/modifying-wordpress-thumbnails/