Quote ... After using graduated ND filters in the field for years, I am now relying solely on this digital darkroom technique to achieve the same results. My bag is a little lighter. I don't have any filters to lose, scratch or fumble with in winter. I can work faster in the field. I have more control over final image quality, which is not reduced by the use of straight-edged filters.
I find that this technique is generally usable for exposures that differ by two or three stops at most. If you try to push the range any further, an unnatural looking image may be the result.
that's a ND filter with an edumacation
Quote ... After using graduated ND filters in the field for years, I am now relying solely on this digital darkroom technique to achieve the same results. My bag is a little lighter. I don't have any filters to lose, scratch or fumble with in winter. I can work faster in the field. I have more control over final image quality, which is not reduced by the use of straight-edged filters.
I find that this technique is generally usable for exposures that differ by two or three stops at most. If you try to push the range any further, an unnatural looking image may be the result.
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hey, look, GIMP can do it too
... another fine EDIT THIS resource
... edumacate me