I frequently resize images to fit into texts I am writing. I simply β the size by 50% in both directions in 95% of cases.
I wrote the macro below which I run after copying the image to the clipboard (I don't need to add copy to the start of the macro because my screencapture app automatically does it.
The macro output is the same image, same size but blurred.
As the KM wiki help article says, these actions refer to pixels, so resizing an image to 50/50 means you're changing it to 50 pixels high by 50 pixels wide, not reducing its size by 50%. To reduce by 50%, you'll want to use the IMAGE() function: