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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 ...
clabacchio's user avatar
  • 2,219
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 ...
Rafael's user avatar
  • 25.1k
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 ...
inkista's user avatar
  • 52.5k
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 ...
mattdm's user avatar
  • 143k
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 ...
Abdul N Quraishi's user avatar
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 ...
Scott Holt's user avatar
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 ...
Michael C's user avatar
  • 175k
7 votes

Gimp perspective tool is not actually transforming

That's because you inadvertently selected the "Perspective Clone" tool instead of "Perspective".
szulat's user avatar
  • 5,059
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 ...
xenoid's user avatar
  • 21.6k
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 ...
xenoid's user avatar
  • 21.6k
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-...
ths's user avatar
  • 7,181
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 ...
jng224's user avatar
  • 1,608
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://...
Steven Kersting's user avatar
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 ...
Rafael's user avatar
  • 25.1k
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. ...
MikeW's user avatar
  • 33.4k
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 ...
L. Scott Johnson's user avatar
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 (...
xenoid's user avatar
  • 21.6k
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%). ...
Ivan Kuckir's user avatar
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 ...
remco's user avatar
  • 3,171
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 ...
WayneF's user avatar
  • 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 ...
xenoid's user avatar
  • 21.6k
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 ...
xenoid's user avatar
  • 21.6k
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 ...
John Cunningham's user avatar
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 ...
Tetsujin's user avatar
  • 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 ...
Euri Pinhollow's user avatar
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 ...
xenoid's user avatar
  • 21.6k
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,...
Peter Taylor's user avatar
  • 1,497
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 ...
junkyardsparkle's user avatar
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 ...
CoolHandLouis's user avatar
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 ...
vaifrax's user avatar
  • 66

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