Avoid generating diff images with no differences in it

[abbrechen]

Hi,

not sure if this is already a feature and I just didn't find it in the documentation and generated diff object properties after the function analysis, but it would be good to have the information if the software has found differences between the two images. If there are no differences, I would like to avoid saving these images.

Maybe something like

var diffImg = pixelmatch(img1, img2, diff, 800, 600, {threshold: 0.1, GenerateNoDiff: true});
// if "GenerateNoDiff" is set to false and no diff was found, the function returns null. If differences were found, it returns the regular obj
// if "GenerateNoDiff" is set to to true, the function always returns the obj

or maybe as part of the generated obj

var diffImg = pixelmatch(img1, img2, diff, 800, 600, {threshold: 0.1});
// diffImg.diff will be true if differences were found or false, if no differences were found

Thanks :)