size identique for all images

Hi,

is it a way to oblige to display always the sames size for all the image, because if we have images with differents size, the slides are with differents size too.

So there is 1 image 250×120 and other 250×100, 250×20 …

Is it possibility to have for exemple
Post image width : 150
Post image height : 100
but for all the image and not cut the image ?

Thanks

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