Скачать или смотреть Gradient correction in GIMP

In this tutorial I show a very simple method for removing gradients from astrophotos in GIMP. It's just about creating artificial model of the gradient, and subtracting it from the original image. So, first you need the layer with the original image (starless or with stars, it doesn't matter). Then, on a second layer, you create the artificial model of the gradient, using the Gradient Tool. You set blending mode of this layer to Subtract, and you add another layer on top, filled with the color which will be added to the result of the subtraction. If it doesn't sound easy it's probably due to my bad English ;) Check the video, all details are there :)