NDFilter « GIMP Guru. In this tutorial I’ll show you how to create a “digital” neutral density (ND) filter for your image in The GIMP.
Seasoned photographers are familiar with the split-ND and graduated-ND filters (example at right). These filters have the effect of reducing the exposure over part of the image being taken in either a graduated or abruptly graduated (split) way. A typical example of the use of a split ND filter would be if you are taking a shot of a sunset. You align the dark part of the filter with the sky and the clear part with the foreground; the split occurs roughly at the horizon. Used properly, you can meter and expose for the foreground details, while preserving highlight detail in the sky and clouds.
QuickMask: Introduction. This tutorial shows how you can do vignette effects using a new feature of GIMP called QuickMask.
QuickMask is a convenient way to modify selections using pixel-changing tools such as the paintbrush, eraser, or any plug-in filter. It lets you make very precise adjustments to your selections. This tutorial doesn't use QuickMask for complex masking; it's intended to show how you can use it to create quick and easy vignette effects. It's even easier than my older vignettes tutorial. You can download a compressed tar file of this tutorial here. Gaussian Blur Overlays. Text and images Copyright (C) 2002 Eric R.
Jeschke and may not be used without permission of the author. Intention In this tutorial I'll show you how to do gaussian blur overlays using GIMP.