This plugin removes low frequency brightness and color differences from image. It's dedicated for creating textures for computer graphic from photos. But it shuld be usefull for other puroses too.
It works fine also for images with non unfiorm structure (bigger details with different brightness color)
For images which contains few big details you can:
- Use bigger filter value
- Disable filtering one of axis (X or Y)
- Erase unwanted details from image (to transparent)
- Select only wanted details
So, for filter this image:
I first selected grass areas, feathered selection and applied the filter. After that I inverted selection and filtred it again.
Installation: Copy script dedicated fr your GIMP version into Script-Fu scripts directory
To run fiter: go Filters/Light and Shadow/Low frequency even