[slowsmile]

st_albert...Because the plugin calculates the image size to a base fixed width size I'm afraid that a ballpark or average image size can only be expected from the calculation I used in the plugin which is shown below:

Image-width-inpixels/630 x 100

And because the base screen width is 630px -- a fixed value -- that also means there will always be variance because the widths from all readers will always vary a little from that 630 base width value.. So this plugin certainly is not perfect. But it will still save you alot of time even if you have to adjust the the individual % widths to your own liking. That's surely quicker than having to manually dual format every single image in your epub which, as Hitch has said, is a long drudge job if you have to dual format 200 images in your epub.

In the plugin there is also an option that allows you to vary the base width value. If you enter a BWV that is larger than the default all the images in your ebook will decrease in size. If you increase it all your ebook images will decrease in size. Best I could I'm afraid.