14
votes
Accepted
How to save JPEGs from GIMP 2.8 and higher?
Use the "Export..." option on the File menu. .xcf is GIMP's native format, similar to how Photoshop uses .psd files, and stores all the information (layers and the like) GIMP needs to edit files in ...
- 19.7k
10
votes
Accepted
How to calculate mean/average photo color in GIMP?
Actually it's very simple. If you open the Histogram tab, there are some basic statistics about the color values, such as mean, standard deviation and median.
Depending on the selected tab (RGB, Red, ...
- 2,119
10
votes
Double exposure photo with Gimp
This is not about blending modes. It is about masks.
These are my source files.
Convert the girl into a grayscale image. The Photo can stay as RGB color image.
Open the Photo and duplicate the ...
- 20.7k
10
votes
Local version of "White balance" in GIMP to clean up photo of document
I assume you have a gradient in overall brightness due to unevben lighting. If that's the case, what you could do is to duplicate the layer with the image and apply the best correction to each part of ...
- 2,119
10
votes
Accepted
How do I create an infinite picture-in-picture effect?
What you're looking for is what's called the Droste effect. So-called because Droste cocoa uses that kind of repeating image on its packaging.
Mathematically this has been figured out, and there's a ...
- 49k
9
votes
Accepted
Why doesn't my Gimp perspective transform apply to the entire image?
You say:
When I select the Perspective tool and click anywhere in the canvas, the grid appears, already scaled to just the subject
Emphasis added, because that's important. This is not the normal ...
- 140k
8
votes
Accepted
Raw is larger and softer than JPG
Of course I don't know. :)
However the most common causes for these things are:
RAW is "softer"
The RAW image isn't 'softer' - JPEG image is doctored in-camera usually with quite aggressive ...
- 4,395
8
votes
Accepted
Double exposure photo with Gimp
Open both photos individually (ie in different windows/tabs).
Select all and copy one photo, then on the other photo "Paste as -> New layer"
This pastes one photo over the other. If the sizes don't ...
- 13.2k
8
votes
Accepted
How to digitally remove reflections on vertical glass fronts?
Although I am not a Gimp User, but the process I use in Photoshop will most likely be very similar and it should not take more than 5 minutes to reach a satisfactory result.
I will start with the ...
- 4,652
7
votes
Photo Editing guide for gimp
The gimp docs, youtube and various gimp tutorial websites already mentioned in the comments are invaluable. I have found that I made the most progress when I tackled photos that I wanted to edit. ...
- 266
7
votes
Gimp's color options not working
I have been having this problem too in GIMP 2.10.18, and finally figured out what's happening. I had the layer visible and highlighted, but the curves are adjusting the RGB channels. That means that ...
- 71
7
votes
How to calculate mean/average photo color in GIMP?
Resize the image to 1x1 and see the color of the pixel you get. :)
7
votes
GIMP Image Auto-Align Plug-In: I. just. do. not. get. it. Sorry!
A better way to align images is by using the align_image_stack program, which is part of the free of charge Hugin panorama stitcher program. To align images, you can copy the align_image_stack.exe ...
- 3,518
7
votes
How can I remove the grid lines during transformation in GIMP?
In the tool options for the perspective tool, under "Guides", you can select "No guides". There are other options, as well, for a sparser grid, etc.
- 5,234
7
votes
A photo effect that favours yellow & blue; What is its name & how is it done with GIMP?
All of the example photos could have been made without any selective processing with regard to color temperature/white balance. They all look like they were made with several different types of light ...
- 167k
7
votes
Gimp perspective tool is not actually transforming
That's because you inadvertently selected the "Perspective Clone" tool instead of "Perspective".
- 4,825
7
votes
Accepted
Remove low-frequency background
Two techniques:
The old technique (Gimp or Photoshop)
Duplicate your image
Set the top layer to Grain extract
Apply a Gaussian blur to the top layer, enough to make vignetting disappear, but before ...
- 16.1k
6
votes
Accepted
Why won't GIMP 2.8 open my long exposure shots?
This would seem to be this acknowledged bug in GIMP; that bug has itself has been closed as a duplicate of this bug, which has been fixed in the development ("master") builds of GIMP by a complete ...
- 19.7k
6
votes
How to fix chromatic aberration with free software?
Darktable can remove chromatic aberrations if you are shooting raw. Your example image is a JPEG so I can't demonstrate how it works with that, but above is a screenshot of it removing the chromatic ...
- 759
6
votes
Adding Exif data to a tif increases the file size
I don't know how you added the exif data, but it could very well be that the application you used for this recompressed the file, and not with jpeg compression.
Windows explorer recompresses a jpeg-...
- 6,770
6
votes
How to digitally remove reflections on vertical glass fronts?
I could come up with the following using Gimp:
As you can see, I only removed the reflection at the word "Erkner". You would probably get better results using a RAW version of the photo and ...
- 1,443
6
votes
How do I create an infinite picture-in-picture effect?
In photoshop there is a shortcut for "step and repeat;" basically, you duplicate the layer and transform(scale)/position it once and use the shortcut to repeat that over and over.
https://...
- 9,588
5
votes
Anyone know of a PS filter that's equivalent to the Retinex filter for GIMP?
I just made a retinex filter for Photoshop and similar:
www.russellcottrell.com/photo/Retinex.asp
It is a little different from the Gimp/ImageJ plugins. I tried to make it easier to understand, and ...
5
votes
Accepted
Post production for beginners
There are some books about Gimp but as you've discovered, not nearly as many as about other programmes, and particularly Photoshop. However, as @Morpho has suggested, searching online is a very useful ...
- 266
5
votes
Accepted
Remove "random" noise
What you are seeing in your example is not random noise. It is what is referred to as compression artifacts and is what happens when an image is compressed too much to make the file size smaller.
...
- 32.8k
5
votes
A photo effect that favours yellow & blue; What is its name & how is it done with GIMP?
That is not an effect. That is a trend.
The trend is to use complementary colors, and there is not much room to choose from. It is either green to magenta, yellow to blue or red to cyan.
In reality ...
- 20.7k
5
votes
Accepted
GIMP: Why can I set a higher quality than original image in the "Export Image as JPEG" dialog?
After loading the image, Gimp is just working with the grid of pixels, which now include noise/artifacts from that first save (as well as noise/artifacts from the original sensor and any processing ...
- 865
5
votes
How to edit more than 8 bits (10, 16 bits) of color in GIMP?
You can use the 0..100 scale:
This is a percentage with one decimal digit, so in high precision modes, it is mapped to 1000 different values, and therefore about 10 bits.
To edit in 16-bit set the ...
- 16.1k
4
votes
Accepted
Why do we even need RAW-specific editing software?
The point of software like Lightroom and Aperture is not to convert RAW files. (In fact, there is some debate that the free manufacturer provided converts do a better job in some aspects.) The point ...
- 34.4k
4
votes
Does Photoshop have an equivalent to Gimp's "Color to Alpha"?
2020 UPDATE: there is no way to do it in Adobe Photoshop. Color Range and masks can not do it.
The image below explains, what Color to Alpha does.
The old image is fully opaque (transparency 100%). ...
- 156
Only top scored, non community-wiki answers of a minimum length are eligible