10
votes
Accepted
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 ...
- 2,234
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 ...
- 25.4k
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 ...
- 53k
9
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 ...
- 4,947
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
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 ...
- 176k
7
votes
Gimp perspective tool is not actually transforming
That's because you inadvertently selected the "Perspective Clone" tool instead of "Perspective".
- 5,069
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 ...
- 22k
7
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 ...
- 22k
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-...
- 7,209
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 ...
- 1,628
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://...
- 19.4k
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 ...
- 25.4k
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 ...
- 897
5
votes
How can I remove blown-out sun glare reflected from a sign?
In the glare the image is totally burned out (all three channels maxed out),
so you best bet is to reconstruct the letters (which, fortunately for you, are mostly straight lines).
I would do this (...
- 22k
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%). ...
- 186
4
votes
Wrong in-camera auto white balance issue
You have an image here with a lot of red in it.
In principle, "auto white balance" uses the average colour of the image to decide what settings to use to make that average colour correspond to a ...
- 3,181
4
votes
What technical terms or rules of thumb do I need to understand for a black and white conversion of a photo?
Grayscale can be sort of a Do It Yourself activity. The issue is, just how dark or bright should some shade of red or green appear in grayscale? The standard Grayscale Menu converts it the way the ...
- 12.9k
4
votes
Is GIMP allow to add or change geo-tag localization in Exif data? Is there any plugin for that?
In Gimp 2.10, the dialog that you reach via Image>Metadata>Edit metadata has a "GPS" tab.
This is a new feature in Gimp 2.10, IIRC.
Edit: it seems to be too ...
- 22k
4
votes
Accepted
GIMP Quality .jpg export - what is the best set up?
Saving at 100% quality will never restore whatever loss has already occurred, and the image from your camera is usually at 95-97 quality. If you save at 100% quality you can as well use a lossless ...
- 22k
4
votes
Accepted
How to apply identical color curves to many pictures in GIMP?
For anyone else wanting to do this I figured it out.
First I got the color curve I wanted, and clicked the plus to "Save the current settings as named preset"
Then next to the plus I pressed Manage ...
- 111
4
votes
GIMP. TIFF. Color profile sRGB IEC61966-2.1 and embedded color profile GIMP - built-in sRGB
Don't convert - at all.
At import tell it not to convert.
At export tell it not to convert.
sRGB IEC61966-2.1 is "industry standard" RGB used for the web.
Any time you do colour-space ...
- 23.4k
4
votes
Accepted
best Gimp blur filter for popcorn ceiling
Personally I find that curves are much better for this.
Select the ceiling (you might also feather selection to make transition smoother).
Open Curves dialog.
Ctrl+Click the point somewhere on the ...
- 5,553
4
votes
Accepted
Removing a color gradient from the Crab nebula in GIMP
The green gradient on the side is actually present in all three channels, but a bit more in green and red:
(this histogram also shows that your blue channel is somewhat undexposed)
So the problem has ...
- 22k
3
votes
How do I create a split-tone effect using GIMP?
The effect is not a single color, but a gradient map, where everything between black and white is replaced with a transition between two colors. To create this effect in GIMP, you would first set the ...
- 5,414
3
votes
Gimp's color options not working
I had the same issue. A black and white image - actually black and transparent. I want to turn the black to white.
Colors > Invert does nothing.
Selecting by color (black) and using Bucket Fill set ...
- 31
3
votes
Accepted
A photo effect that favours yellow & blue; What is its name & how is it done with GIMP?
I agree with the earlier answers that the example photos primarily got that way by use of lighting rather than post-processing; and I don't have a name for an effect that enhances yellow-blue contrast,...
- 1,497
3
votes
How can I overlay two images exactly by scaling one of them in gimp?
I just did this in Gimp with no additional software. This method will easily and precisely produce the "3 point scale, rotate, translate" that you asked about. If there's other perspective issues ...
- 131
3
votes
Accepted
Remove sun glare using GIMP
GMIC is a powerful GIMP plugin with a lot of filters for enhancing local contrast.
You could also duplicate the layer, increase the contrast such that the top right is fixed, and manually erase the ...
- 66
3
votes
Leica Q2M JPG files cannot be read by any of my Ubuntu (21.10) image software
I've concluded that this is a hardware issue. An external USB card reader works properly; there's nothing wrong or unusual about the files involved.
The machine is a fairly old (2013) Dell Inspiron 15&...
Only top scored, non community-wiki answers of a minimum length are eligible