Simulating HDR in Gimp
Simulating a HDR (High Dynamic Range) effect is possible in Gimp, which is the popular and free image editing software. The effect is achieved by blending the photos with the help of layers. Let's see how this is done when you have two photos of the same scene taken at different exposure settings. It is better to take the shots with a tripod; otherwise, extra work has to be done to get the right alignment.
Step 1: Open the Layers, Channels and Paths Dialogue Box
You will need to decide which of the two photos will be going on top and which will be below. Load the image that is going on the bottom, and in the Layer's dialogue box, click on the New Layer button or click Ctrl+L.
Step 2: Copy and Paste
Now, select the image which is going on the top by clicking Ctrl+A, and then copy it by clicking Ctrl+C. Go the Layers box and select the new layer, and then on the bottom image, paste the image you have copied by clicking Ctrl+V. Then, the Anchor button has to be clicked, so that the floating image is anchored.
Step 3: Adjust Opacity
In the upper layer, opacity value has to be lowered so that both images are seen. You now will have a depth of range in the image you have just created.