Evelyn and Alberta one summer in the early 1950s. Kodachrome slides hold their colors but they still fall victim to scratches and spots. While removing defects from this slide I found that sharpening the image, running Laplacian edge detection in the HSV color space, setting the white and black points way off the scale, followed by a Gaussian blur and another extreme setting of black and white points, produces a nice bit mask that mostly selects spots and scratches. I used this mask to blur spots and scratches after my normal tedious healing brush and clone routine. One of these days somebody is going to create an image defect removal program that actually works.
From From Hazel's Albums