Photoshop is used to calculate a spatial frequency graph?

I'm about to start the scanning of slides. To keep storage required under control, I can decide scan images at reduced resolution. There is virtually no difference in distinguisable of clarity between scan 4000 dpi and 2000 DPI on several of my test slides.

Which got me thinking: How can I determine if I can scan a slide at reduced resolution and not lose clarity? One idea is to scan at 4000 dpi, generate a graph of space in PS frequency (if that's the right term), and if there is little more than a certain spatial frequency information, I could re - sample at a suitable resolution less than 4000 in order to reduce the size of the file but not reduce clarity.

By analogy: I've been scan tapes, some dating back to 1972. I can use audio tools to draw a frequency spectrum of the recording and if I find, for example, that a certain early record has a response of 200 to 8 kHz, and then I would lose nothing by resampling to 22.05 kHz instead of CD 44.1 kHz quality.

I don't know if the images have a similar spectrum "frequency". Wikipedia has this to say:

The extent of the narrowness of the lines can be resolved in one image is called spatial resolution, and it depends on the properties of the system of creating the image, not only the resolution in pixels... For all practical purposes, the clarity of the image is decided by its spatial resolution, not the number of pixels in an image.

If my interpretation is correct, that is to say that if you scan a blurry picture at 4000 dpi, you will end up with many more pixels than if scanned at 2000 dpi, but those extra pixels contain no information that could be used to improve the clarity.

Yes, is there a PS tool that analyzes the spatial frequencies in an image? If so, I could use this tool and then tell me: "well, the majority of the information contained in this particular analysis has a spatial frequency less than 1000 lines per inch. If I scan (or re - sample) this image to double that figure (to get above the Nyquist limit), I will not lose any clarity.

There are a few plugins that eliminate the frequencies low ripples of workplaces using the Fast Fourier Transform to filtering. The FFT is required to generate ghosts who would do what you want. Google it.

Tags: Photoshop

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