graphic design, open source, science

Create uniform lightness of a image

Removing gradients or uneven lightness of an image specially to use it as a map is easy using Hard light layer mode in Photoshop or Gimp.

Steps using Gimp:

1.Duplicate the layer

2.On top layer go Filters.Blur.Gaussian Blur 

Here use a value depending of image size and map details 100-200px

3.With still top layer go to Color.Desaturate

4.Go again Color.Invert

5.In Layers tab make the top layer mode to Hard Light



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