Storing preprocessed images

[an3252sv]

I am planning to preprocess my dataset using standardization to zero mean and unit variance. But I don't know how to store the images when they have been preprocessed. Currently they are in jpg-format, but what format can be used after I have preprocessed them?

If i instead scaled the pixel values from 0-255 to 0-1, what image format could I then use?

Also, if I train the network on preprocessed images and then want to apply it to a video, I assume I need to somehow preprocess the video to get decent results. How would I go about doing that?