Better Photos Using Image Stacking With GIMP (Updated Tutorial) - Reduce Image Noise - Jody Bruchon
Тәжірибелік нұсқаулар және стиль
Part of my GIMP Tutorial Playlist: • GIMP Tutorials by Jody...
Image stacking tutorials for Adobe Photoshop and Lightroom have been around for years, but they cost money! Gimp is a free image editor and with the help of a free plugin you can do the same image stacking technique without buying Photoshop.
Even a really cheap camera can take good photos if you can stick it on a tripod and combine several shots into one. In this video, I'll show you how to take a bunch of noisy videos with weak detail and use Gimp with G'Mic-Qt to stack them into one high-quality photo. Get G'Mic-Qt here: gmic.eu/download.shtml
Update: this works with Gimp 2.10 as well; make sure you download the correct version of G'Mic for Gimp 2.10! You can also "cheaply" stack images (though the quality will be somewhat lower) by loading all the photos as layers and changing all of the layers to 50 percent opacity except for the bottom layer. This will have the effect of averaging the pixels rather than taking a median which is an inferior method of stacking but works in any image editor with layers and per-layer opacity.
A step list was requested by kelsi6273, so here it is:
0. (Prerequisite) Take several identical photos of the exact same thing with the camera on a tripod using full manual settings.
1. Install Gimp 2.8 and G'Mic-Qt and open Gimp.
2. Open the first image in Gimp from a file explorer window.
3. Select all other identical images (excluding the one you opened) and drag and drop them all into the Layers Panel. If it's difficult for you to select them all, drag them one by one.
4. Go to the Filters menu - G'Mic-Qt...
5. In the list of filters, expand the "Layers" category and select the "Blend [median]" filter.
6. Make sure "Input/Output" drop-down boxes are set to "all visible" and "new active layer(s)" (the other two don't matter much.)
7. A new layer will be created with the stacked result of all the images you've loaded combined. You're done!
8. If you get an out-of-memory error, try stacking less layers at once, then stacking the resulting stacked layers into a final stacked layer.
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Пікірлер: 9
Have used GIMP in the past. Very useful, never heard of this technique, thank you for sharing
Cute gimmick this G'MIC-Qt. I've been using it for four or six years myself. Very useful collection of plugins, effects, filters, and other tools that save tons of time.
Very nice tutorial. I use GIMP myself all the time. It's awesome.
It's nice to see a Windows user using GIMP. Pretty much the only thing I use it for is drawing up puzzles and printing them off.
This is neat! Didn't thought of using this technique for removing noise, but it makes perfect sense. Well, I don't do much photos nowadays anyway. Isn't this the same exact technique to remove tourists from tourists attractions ? Like, you go to Italy or Greece and want to take a photo of a fountain or a sculpture. You can see it, but there's ALWAYS some people there, which prevent you from taking a clean shot of the fountain, unless you block the area for a bit. You can set a tripod and take multiple photos (preferably more than 10), but not in immediate succession, but at longer time intervals, like 30 seconds or one minute. Assuming it's not THAT crowded, that the people going between you and the fountain are usually just passing then, using this technique, you can get an image completely without them. The idea is that using the "median blend" for each pixel, the one that has the same color the most amount of times, that will be the final pixel. And in this context, the fountain is the one that will appear the most often, and with the same color.
@JodyBruchon
3 ай бұрын
Often people will use a strong neutral density filter and a very long exposure for that.
The best example of noise reduction is on the sky...
Use a tripod? 😂 Okay, you used one. Why not set the ISO lower? Image stacking to me makes sense only for moving objects or cameras. Structure from motion or superresolution.
@JodyBruchon
3 ай бұрын
There are plenty of articles about image stacking if you want to understand why it exists. If you want to reduce ISO to remove noise then you also need a long shutter, and if it's not dark out you'll have to learn to use strong ND filters too.