Questions tagged [gimp]

Questions about GIMP, the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. Ask scripting questions on Stack Overflow, software support questions on Super User, and anything related to design here on Graphic Design.

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14
votes
3answers
22k views

How can I map the colors in a greyscale image to a specific color gradient?

I’m attempting to add color to some greyscale icons (i.e. all three channels are identical). I want to map the colors such that the brightest grey becomes one specific color, the darkest grey becomes ...
14
votes
1answer
8k views

What algorithm do the NoHalo and LoHalo resize methods use in GIMP?

The GIMP resize tool used to have only None, Linear, Cubic/Bicubic, and Lanczos, which are reasonably well documented algorithms that one can do research on, if one is so inclined. I can't find any ...
14
votes
2answers
15k views

Can you draw a constrained straight line with GIMP's paths tool?

In GIMP, you can (in various modes) draw a constrained straight line which will "snap" the line you're drawing to the nearest 15 degree angle, making it easy to draw lines in a precise direction. For ...
13
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5answers
68k views

How to add a simple border into an image in GIMP

I'm very new to GIMP and found that doing simple stuff in GIMP is much harder than it should be. All I want to do is add a simple black border around an image layer. I have added this image using the ...
13
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2answers
15k views

how to display current colour values of pixel under cursor in gimp?

Is there a way to display the colour values of a pixel currently under the cursor? I've seen that in different other software. Why do I need that? I have to clone textured areas in a picture. But ...
12
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4answers
85k views

How do you cut out the centre of an image, bringing the edges closer together?

I need to cut a large number of columns out of a PNG image. The area I want to remove is in the centre of the image; I therefore want the left and right edges to be closer together after the cut. I ...
12
votes
2answers
21k views

Hard edges on bucket fill tool in Gimp

I am trying to fill a selected region using the bucket tool in Gimp. I want everything to have hard edges, no gradual shading unless I do it myself. However, when I fill the region I end up getting ...
12
votes
1answer
5k views

Can I predefine brushes with color and size in Gimp?

I sometimes find myself using Gimp the way I would use paper. For example, I want to use blue ink size 1.4, anthracite 2-px pencil and size 20 eraser, to recreate the look of a school notebook. I don'...
12
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5answers
27k views

Fill Canvas with background in GIMP

I have a bunch of images whose size is 750x1000 pixels. I wanted to make them 1000x1000 without risking stretching the depicted object so I have enlarged the canvas and centered the original image. ...
12
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2answers
23k views

How to apply anti-aliasing to a layer with a transparent background?

I have one layer with some black pixels in the middle and a transparent background. If I add an opaque white background under it, merge both, and then click "Antialias" from the "Filters" menu, it ...
11
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2answers
36k views

How to convert color images to black & white in GIMP?

I've a color image and want to print on my black and white printer. So, How do I convert it to black & white using GIMP?
11
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3answers
3k views

How to stretch the middle section of an image to a new width in Gimp

First off, I don't use Gimp that often, so what I'm asking may be simple and I've missed something obvious. But... I'm trying to modify the following image in Gimp. The image size is 489x63 however I ...
11
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1answer
6k views

In GIMP, how do I use an image as a color reference to colorize a black-and-white photo?

Let's say I have created a layer on a black-and-white image with a layer mask to colorize some parts (for example skin). I am able to change this with Colorize and change to any color. But how do I ...
11
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4answers
62k views

PNGs made in GIMP not coming out transparent

I’ve had this happen with more than one image lately. I open an image in GIMP with the purpose of making the background transparent. The first thing I do is Add Alpha Channel. I proceed to remove ...
11
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6answers
25k views

How do I brighten a part of a picture with Gimp?

Say I wanted to bring out the colors in the shadowy bottom right hand part of the attached image, how would I go about it? I assume I need to restrict the processing to that part but I have no idea ...
10
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4answers
4k views

How do I replace the blue color with red in this image?

I'd like to replace the blue in the linked image with red. What is the easiest and best-looking way to do this? I had the idea of selecting the gold trim and colorizing the inverse, but that would ...
10
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3answers
21k views

How to draw arrows in GIMP 2.10?

I'd like a plugin that allows me to click 2 points to draw an arrow in between. All the options mentioned in different posts work for GIMP 2.8 but are broken in 2.10 (such as the arrow.scm file ...
10
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5answers
21k views

Swap Colors (not Invert them) in Gimp

I know how to Invert Colors but is it possible to swap Colors? For example from this one: To this one: So that I select one Area and then swap Colors (or even the full Layer/Picture)? By the way I ...
10
votes
5answers
10k views

Select inside/outside of a border

This seems like a basic feature, but I'm missing it somehow. I have the the outline of a state with a discrete colorful border. I'd like to select the border AND the inner contents so I can produce ...
10
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2answers
53k views

How can I shrink these areas using gimp?

I have an imagemap. I want to shrink to areas that are pink and are overlays when hovering the mouse over the map to highlight the selected region. Now I can't seem to shrink the pink areas that are ...
10
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6answers
22k views

Gimp: Pick color on screen without taking screenshot

Sometimes I want to quickly use a color that I see on a picture, website or program. I usually take a screenshot then open it in Gimp and use the "Color Picker" tool. Is there another way to do this ...
10
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5answers
6k views

How to change color of multiple text objects at once

I'm using GIMP and I have a lot of text object in a project that must have the same color. Every time I want to change this color I have to select the texts one by one and change it. Is there a way to ...
10
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1answer
4k views

How do I do Ctrl-Left-Click operations in GIMP on Mac OS X?

When you ctrl+ left-Click, it's like a right-click in Mac OS X and brings up a menu. I'm trying to clone a selected rectangle as shown here But if I ctrl+alt+ click, I just get a context menu ...
10
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1answer
48k views

Using GIMP, can you "erase" a color?

I'm presently working on an iOS application and I am attempting to reverse engineer their standard alert dialog window. I have managed to figure out what the alpha value on the background it uses is ...
10
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3answers
11k views

How do I deal with color spill in chroma key using GIMP?

I'm experimenting with "green screen" techniques to remove the background around a test subject. The test shots were taken in front of a bright green background in moderate to bright lighting ...
9
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2answers
1k views

Adding transparency to ink drawing

I would like to add transparency to the following image I simply want anything not inked to become transparent. I have gimp and I can also use some online tools, if available. I tried using gimp and ...
9
votes
2answers
40k views

Can't use any colors other than black in GIMP image

I opened a .png file I had in GIMP and started editing it. The image was only black and some transparency. I selected the paint bucket tool, chose white as my color but when I fill in anything it is ...
9
votes
2answers
11k views

After making a selection float in GIMP, how to move it in a straight vertical or horizontal direction?

I am doing kerning manually in GIMP, i.e. trying to move letters closer to each other, but my hand movements are not exact enough on my mouse so whenever I move a layer to the left or right, it also ...
9
votes
2answers
26k views

How to find the vertical midpoint of a Gimp image or canvas?

How can I locate the vertical midpoint of a gimp image? I searched online and found this post, but it didn't give me the simple, step-by-step solution I was looking for.
9
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2answers
39k views

GIMP: Remove text from background [duplicate]

Im completely new to image editing, so excuse my immaturity... I have the following image: I want to remove the writing on the blackboard and replace it with something different, keeping the ...
9
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6answers
11k views

Moving Multiple Layers in GIMP

I'm not talking about applying a transformation or anything; I want to select multiple layers and physically change their order in the layer list (or whatever it's called). There doesn't seem to be a ...
9
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2answers
20k views

how to trim an image in Gimp [closed]

I wanna trim all white spaces surrounding an image's content using Gimp. Is there some straightforward method, or any trick?
9
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3answers
35k views

How do you create a translucent white background for text?

I am really struggling to create a white translucent background for text on top of an image with GIMP. Pottery Barn Kids (http://www.potterybarnkids.com/) has one example of what I am trying to ...
9
votes
5answers
4k views

Convert image into mask

I have a green background picture with some shadows. I would like to use it as a mask so I can place it on background with any color (e.g. red or pink) and get the same style of shadows. I tried ...
9
votes
1answer
3k views

In GIMP, how do I get the smudge/blur tools to work properly?

I use the smudge tool very often in GIMP while painting. Unfortunately, the algorithm tends to generate a much darker version of what the smudged color ought to look like. For instance, a normal ...
8
votes
8answers
17k views

How can I make a screenshot look like a photograph taken of a real surface? [duplicate]

Possible Duplicate: How to get this blur texture effect in photoshop? I'm starting from a plain old screenshot, and I'd like it rotated in 3d, with more distant parts more blurry. Is there a ...
8
votes
3answers
10k views

How to remove background in a scan of an old drawing

I have the following image which I would like to clean using GIMP. Usually, with B&W images one of the following methods works, see here or here. However, I have 3 additional problems in this case ...
8
votes
1answer
15k views

Removing all partial transparency in GIMP

I have an image that has transparent edges around a main drawing, the edges are a semi-transparent black. Is there any way to remove all partial transparency from the image instead of removing all ...
8
votes
1answer
14k views

How can I replicate Photoshop's content-aware fill in Gimp for Windows?

I want to remove an object from a photograph based on the surrounding patterns. In photoshop I could use the Content Aware Fill Tool, but there doesn't seem to be any built-in alternatives for Gimp on ...
8
votes
3answers
10k views

Gimp - Level adjustment as layer, like photoshop?

Is there any way to adapt the levels of an image through a specific 'level' layer, like in photoshop ? I find it very handy to have it as a layer. See below, I'havent found a way to achieve that... ...
8
votes
1answer
15k views

How to change all pixels in Gimp that are not one of two colors to white?

I was trying to submit an app to the Windows Phone app store. Here all pixels need to be white (#FFFFFF) or transparant (#FF####). I had a black logo on a white background. To make the background ...
8
votes
3answers
18k views

Export PNG image without alpha channel in GIMP

How do I export a PNG image without alpha channel in GIMP? I have checked a lot, but I can’t find this. I found an option to export PNG images without alpha channel in Inkscape, but I am not familiar ...
8
votes
2answers
8k views

How can I quickly delete multiple layers in GIMP?

I have an animated .gif open in GIMP with 48 different layers. In Photoshop I can quickly select and delete layers multiple layers at once, but it seems that this isn't possible in GIMP. My current ...
8
votes
3answers
8k views

With GIMP, how to crop a layer to the size of a different layer?

I have multiple layers in my project. I need to crop one (call it layer A) to the size of another (layer B). Neither has the full size of the image. I thought I would switch to B, Select All, switch ...
8
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2answers
2k views

How can I select the convex hull of an existing selection?

I'm trying to remove blue skies with clouds quickly from many images. I've used gimp's Color Selection Tool, which selects the sky but not the clouds. Since all clouds are in the sky, if I could ...
8
votes
4answers
56k views

Is it possible to add a background image to all 'layers' of an animated gif?

I have an animated gif with transparent background, and I want to add a background image to all layers: How can I achieve it without adding it to every layer individually?
8
votes
2answers
10k views

Resize part of image in GIMP

I have a photo that is 15360x5079 pixels. I want to load it into Marzipano, to make a panorama, but it requires that the file be in 1:2 aspect ratio. So the final height needs to be 7680 pixels. The ...
8
votes
2answers
22k views

How to lock a layer from changes including position changes?

Very standard use-case to lock a layer from unintentional modifications in graphic tools. How is this possible in GIMP? I've tried the "Lock pixels" "Lock alpha channel", also the layer menu doesn't ...
8
votes
3answers
5k views

Why can I create layers, but not layer groups in the indexed color mode in gimp?

I'm making some pixel art in gimp and I so I figured I should use the indexed color mode since I won't be using very many colors. About halfway through my project I realized that I wanted to be able ...
8
votes
1answer
2k views

How to create a saturation map?

Is there an easy way to create a "saturation-map" in Photoshop/Gimp? I need a grey-scale version of an image showing where the colors have less saturation (black) and where they have more saturation (...

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