Slide Show Stack Fade to White?

Although the owner of various and sundry slide show stacks, I am looking for a capability that I am not sure exists.

I would like the slide show images to dissolve to white, before the next image appears, rather than fading one image into another. The latter technique works fine when the images are all the same size, but the images tend to get distorted, to a greater or lesser degree, if they are not the same size. The worst culprit is unfortunately my latest acquisition, the RefinedSlider from the usually impeccable Stacks4stacks.

I thought that it might be possible to insert a white frame in between all the images, but of course that doesn’t work, because it gives equal weight to the white. It is a solution that would necessitate individual control of slides.

Wondering if anyone has any suggestions?

Thanks.