First we opened levels. We wanted to ensure you have strong contrast if your image is close in. I darken some of my darks but also lighten my midtones and highlights.
I set my Image to “Indexed Colour” in Image > Mode > Indexed Colour to counteract that.
I brought up Image Size. From here, we sized it down from the high resolution file to something tiny
I size mine down to a width of 70 pixels
I opened up Image Size, change the pull-down tab that reads “Pixels” to “Percent.” I blow up my image to 400 percent of it’s new size. We would get better results if you use multiples, like 200 percent (2x) or 1000 percent (10x)