The "Flat-Field" option of RT/ART raw converters is usually used to correct vignetting or color vignetting ("color shift").
However, the "Flat-Field" can also be used for dust removal. The method is essentially the same, but the blur radius should be set to a lower value. For example, I often start with a value of 4.
My Ricoh GR is prone to dust, so I use it to demonstrate the dust removal method.
A Flat-Field image (at f/5.6), once again, I use sky shot:
An image (at f/5.6 too) without the Flat-Field correction.
The same image with the Flat-Field correction (a blur radius of 4).
The dust has been removed. The vignetting has also been corrected.
It is a powerful tool, but the main problem is taking the right flat-field images for the apertures. If the dust moves, these images should be reshot periodically.
See also related notes:
- Pentax DA L 18-55/3.5-5.6: 24mm on FF (vignetting and Flat-field) (2024-04-30)
- Ricoh GR: once again about dust (2023-08-27)
- RawTherapee (2022) и ART (2022-03-30)
- NX20, Зенитар 16/2.8 и color shift (2014-01-21)
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