GIMP for Beginners 11: Photo Manipulation, Enhancement and Correction | Brian Jackson | Skillshare

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GIMP for Beginners 11: Photo Manipulation, Enhancement and Correction

teacher avatar Brian Jackson, Author/Publisher/Educator

Watch this class and thousands more

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Taught by industry leaders & working professionals
Topics include illustration, design, photography, and more

Watch this class and thousands more

Get unlimited access to every class
Taught by industry leaders & working professionals
Topics include illustration, design, photography, and more

Lessons in This Class

8 Lessons (28m)
    • 1. Introduction

    • 2. Photo Manipulation Basics

    • 3. Removing Redeye

    • 4. Remove Blemishes and Scenery

    • 5. Add Image Effects

    • 6. Adjust Colors and Brightness

    • 7. Export Your Work

    • 8. Gimp for Beginners to Intermediate, Photo Manipulation, Correction and Touch Up

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About This Class

In this installment of GIMP for beginners you will learn how to perform photo manipulation and correction to touch up photos and images.  We'll also apply some fun image effects.

The GNU Image Manipulation Program (GIMP) is a free software tool that runs on Windows, Mac OS and Linux platforms. You can use this free graphics tool to create sophisticated imagery similar to that produced using the much pricier Photoshop product.

The following topics are addressed in this course:

  • Photo Manipulation Basics
  • Remove Redeye
  • Remove Blemishes & Scenery
  • Adjust Colors and Brightness
  • Add Image Effects
  • Export Your Work

If you could use some free help working on you photos, this is the class for you.

I'll see you in the classroom,


Meet Your Teacher

Teacher Profile Image

Brian Jackson



Born in Los Angeles in the middle of the last century, I have always wanted to be a writer. After twenty-five some odd years spent working in the computer industry in the heart of the Silicon Valley, first for Lockheed as a Systems Programmer and later for Cisco Systems as a test tool developer, I managed to retire early and begin my next career as a self-published author.

Along with writing and publishing my own novels I also publish the works of my wife, Melanie Jackson. During the past four years I've published well over 100 books in paperback and eBook formats. Oddly enough this includes eBooks on how to self-publish books and how to create professional looking book covers using the GIMP. I've also recorded and distributed a pair of audiobooks available for purchase on Amazon... See full profile

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1. Introduction: Hello. Welcome to my class on gimp. Photo touch up. This is a class about the gift or the canoe image manipulation program. Kim for short, the gimp is free. The gimp runs on Windows, Mac OS and Linux. Unfortunately, the gimp is also complicated. After all, why else would I have to produce all of these courses in my gimp for beginners? Siri's The gimp looks like this. Like I said, complicated. However, gimp photo manipulation is simple. There's no need to learn all of this. To do this in this class, you will open of photograph in the gimp, rotate, flip, resize and crop that photograph. Remove red eye as needed. Remove blemishes and unwanted scenery. Set the color, brightness, contrast, hue and saturation for your image. Then add image effects like See Peotone. Finally, you'll learn how to save and export your work. That's it. No frills, no bonus material. Simple now, of course, if you'd like to take all my courses in my gimp for beginners, Siri's, I encourage you to do so. In fact, I list them in the class description along with links to each course. But you don't have to. All you need to do is enroll. I thank you for your attention 2. Photo Manipulation Basics: Hello, everyone. In this lesson, I'm not only going to show you the fundamentals of the gimp, basically how to rotate, flip, resize and crop. But I'm also going to show you how to start the gimp and a little bit about its windows and menus. So to begin with, I've set up the gimp to be on my task bar Down here on the bottom. I just click once on it and it starts to load. Its resource is and then comes up in the familiar three window configuration. We're gonna work primarily on the window on the right to begin. I'm going to assume that you have an image saved and that it's in one of the formats that the gimp can read. For instance, PNG J. Peg. I'm gonna go in open one. By using Now, I'm gonna go and open an image that I've targeted for this project by saying file open that throws up a file selector and I'm going to go to my pictures directory and a folder in which I put purchased images and find the image that I'm interested in. Here it is. Now I'm gonna take the window and shrink it a little bit so that I can fit it into my recording area. After doing that, I'm not seeing the entire image, so I'll use view zoom, fit, image in window to be able to see the entire image. Now, in some cases, you get an image that's upside down. This is very common when scanning, and sometimes you just hold the camera upside down, so I'm going to show you how to flip in. Image will go to image, transform and pick either rotate clockwise or counterclockwise 90 degrees or rotated 100 and 80 degrees. Now notice. If I do rotated 90 degrees that it's rotating the entire image, I've got to make the window a little larger and not just the layer and then cropping it. So for rotating an image, this is what you want to use. Image transform and the rotate operations. The next thing we're gonna talk about is flipping an image. Let's go ahead and edit. Undo the rotate operation. If you ever make a mistake, just use edit. Undo to undo that mistake. Now I'm going to show you how to flip the image. Sometimes you get an image that's may be a reflection in a mirror or you want to flip its letter doesn't look identical if you get a by an image off the Internet like I bought this and you don't want it to look like everybody else's image. One way to easily make it look different is to go to image transform, and you can flip either horizontally or vertically there. That was a horizontal flip image transformed vertically would flip top to bottom. And once again, if I don't like those transformations, I can undo the operations wanted a time I can keep going through my undo history all the way back to the beginning. When I opened the image, The next thing that I want to do is talk about re sizing and cropping. Now this image is fairly large. A 34 79 pixels by 28 76. Suppose we only wanted it to be about 1200 pixels wide. Then you would use image scale image, and as long as this chain is unbroken here, it will maintain the aspect ratio between width and height. So here we can change the with to 1200 and click down on the height and it will automatically be changed proportionally for us. The other thing that we can do is change the resolution. If we're viewing on the screen, then 72 pp, I is sufficient. Once again, it will set the why Resolution? If we're planning on printing this image than 300 p b, I is what you want and here it changes the X. So let's go ahead and scale this image. You notice it gets much smaller. Once again, we can do view zoom, fit, image and window. And the image fills the window. Its dimensions are now much smaller 1200 by 9 90 to the next thing that I'm going to tell you talked with you about is cropping an image now that also makes an image smaller but it doesn't necessarily have to do it. Maintaining the aspect ratio, for instance, I can crop this into a wide, narrow image by using image canvas size. Now, this is asking me what I want to crop this image is it down to? If I want to crop both left and right, I can again maintain the aspect ratio by changing these chaining these together. I don't want to do that. I only want to crop the height. So let's make this more like 400 when I click up and with you'll see that the preview images showing me the area that's going to be cropped, which is the very top I can click center and a Y offset will be added to center. This and that's exactly what I want is the fat area of the image. So let's go ahead and do the resize. Now you can see that our image is short and wide, so we've just gone through how to file open and image. How to change the size of the viewing window by dragging the corners. How to change our view to zoom, fit, image and window. How to rotate an image by using image, transform and rotate 90 degrees in their way or 100 and 80 degrees. You'll also find the flip, vertical and horizontal tools here in image transform. Then we looked at image scale to make the image smaller, bringing it down from over 3000 pixels to 1200 wide. Then we used canvas size to crop the image to be very wide and short in subsequent lessons . I'm going to show you how to modify this image further and then save your work 3. Removing Redeye: This next lesson is likely to be one of the shortest in history. Fortunately, my wife volunteered a picture for it, and I gave her red. I actually it's probably a more interesting lecture on how I gave a red eye than how I'm about to remove it. So let's bring up a picture of my wife with artificial red eye, and you can just barely see the red eye. Here, let me help you see it by doing a view. Zoom to something like 2 to 1. Now you can see that she indeed has severe red eye. And what the red eye removal does is it searches for this and then it removes it. You don't have to do anything with the image other than, say, remove at it, Read I let me show it to you. You go up to filters, enhance and come down to red eye removal. Now it shows you a preview, and in the preview we can see that the red eyes gone. We don't see the severe red spots, and we can zoom in on that preview to make sure see the red eye disappears. You can also control the threshold for how hard it looks. Red eye. So if it starts winking out other areas other than the red eyes on your photo play with the threshold. But basically you just bring up the tool and say, OK, and your red eyes removed now. Two things you should notice about this image. The first Is that all? Not all of the red. I was removed. There's a red halo here where it didn't quite remove everything there. We need to adjust the level of the red eye removal. The other is that it's removed parts of Melanie's face where there might be read. It's interpreted, that is red eye. So we're gonna go ahead and edit. Undo that red eye removal, and I'm gonna show you the correct way to do it. It requires doing selections, so the first thing we do is we do it one eye at a time, and I go up here and use the elliptical selection tool. Just click on it and then come down to the picture and click in the upper left hand corner and make a circle around the red eye. Now you're constraining the red eye removal toe within the circle, so it doesn't matter if it's perfect, just make it bigger than the red eye. Now go do your red eye removal again. Filters enhance red eye removal. Now the other thing we want to do is adjust the threshold upwards to get all the red eye. Here you can see I've zoomed in on one of the eyes and there's a little bit of a halo. Now you can see that halo going away as I increase the threshold to about 62. Let's go ahead and apply that and the red eyes gone. How did you get that? I hope so. And if not, we're going to do it one more time. Make sure the elliptical tool is selected and pull a circle around the red eye. If you're slightly off, you can drag the circle around and have it completely enveloped the red eye. Now we go up to filters, enhance red eye removal, and with our enhanced threshold, we can now remove the red eye, and you could see that parts of her face are gone. Let's go ahead and view zoo fit, image and window. And here's the image without the red eye 4. Remove Blemishes and Scenery: Hi. In this lesson, I want to teach you how to remove blemishes from images and other unwanted things. And in fact, you can actually use this technique toe add things that you want. So what I'm gonna do first is I'm gonna work on the blemish idea. And to do that, I'm going to bring up my very own profile picture. Now my wife is complained about, and so is my brother's a professional photographer about some of these Knicks and stuff. My forehead thinks that I should get a better profile picture, but I'm just going to clean it up a little. Let's go ahead and we'll do a view. Zoom, say about 2 to 1 to zoom in on my forehead. Now, here you can see I do have something going on here on my forehead that I could easily remove if I could get some skin over it. That's where the healing tool works. And what you do is you pick the healing tool and then you go over to your image and you pick some skin that looks good, the skin that you want to use to hell with and you hit the control key hold it down and click. That sets where you're gonna clone from now. We just click to clone, too. So if I want to use this skin here to cover up the slight red area, I just started clicking on it and you can see it's being removed. We could get some of this down here, and they're completely gone. Take this thing here and you're out of there. You can just keep moving around your image, finding various blemishes and so on, and go ahead and remove them just by clicking until they're gone. Here will remove this. I've got a little skin discoloration there. It's gone, and that's the way that you use the healing tool to fix images. Now there's another technique that you can use to to replicate things so that you can remove things on a bigger scale like entire scenes. Let's do a view zoom fit image in window here so that you can see that this has been greatly improved and then we'll go over to yet another image. Now here supposed that we didn't want thes flowers in the foreground or we want more of a layer here in the background. Well, What we could do is use a close relative to the healing tool called the Clone Tool. It's right next to it. This is for a little bit broader cloning, whereas the hell Tulis for smaller areas. Once again to set your clone area, I go to I hit Control Pictionary out here with leaves and I click now I've set my control area. Now you could see that my clone brushes very small to make it larger. All I do is use press on the keyboard, the square bracket key, the open square or the closing square bracket key increases the size of the cologne area, while the open bracket key makes it smaller. So make it about the size that you want. And now I can clone these bushes over things. Now, just rather than just pressing and releasing the enter key. What I'm gonna do is I'm gonna fan the thing quite a bit here and periodically release the left cursor key so that I can reposition what I'm cloning from into the green area there and here you can see we're removing flowers quite successfully and it looks actually pretty good. Let's get along here and in here and you could see here. I'm also holding down the left control key for much longer than I did with the healing tool , some covering much bigger areas. But I am releasing it periodically because what I don't want to do is pull the clone notice it moves around with where I'm cloning to my cloning from. I don't want this to move into the purple flowers of the yellow flowers and start painting additional flowers here. So I've got to keep releasing to keep it in the green area. And there's lots of green foliage that I've painted over that flower. So that's the way that you remove scenery that you don't want. Now, if you want certain scenery, you can always put that in with the clone tool. For instance, of this purple flowers of interest to me, I would hit control, click on the purple Flower, and then I could start painting it in over here to get additional purple flower here. I'm holding the clone tool down completely so that I get a picture of the purple flower. I don't want to reposition my clone source, and there we go. Purple flower duplicated so That's the way that used the clone tool to remove things that you don't want and add things that you want. 5. Add Image Effects: in this lesson, we're gonna have some fun. This is the fun part of the gimp, and that's adding image effects. So I've got this profile image of me, and what I'm gonna do is I'm gonna add effects to it. Now, the effects primarily that we're gonna use are under filters, So pull down filters. And here, look at all of these effects as part of your homework assignment, I'd like you to look at all these now there are a lot of them and one of them that I'm going to use right away is under deck. Or and I want to make an old photo. So you go ahead and you pick old photo and look all these things you can pick the border. Whether it's going to be focus, let's have it model and see what that does. And it's gonna work on a copy, so it'll make a copy of this image. Here it goes through going, doing all that stuff galaxy and blurring adding noise. And here's the old photo that it's created and you see it as actually has modeled it. Now you can also add additional effects. So on this already image affected image. I could go back down to decor, and I can add coffee stain and you could see that it adds some serious coffee stands to this image. In fact, it almost destroys damage. Ah, there we go. There's a couple of coffee stains that's interesting, so you can really make an image look old and beat up. If you don't like that, just go ahead and discard the changes by closing the window. Clicking on the X Let's try some other effects filter. Now check out the artistic effects here. You can do cartooning and cloth if I and stuff like that when you see what would be fun, let's do predator. I think this one looks really neat and all you got to do to try it out is give it a shot. So this is what the Predator sees from the movie, and if it applies it to the image toe, undo it. You just go upto edit, undo, And if it makes another image, just go ahead and kill the window. If you don't like it. If you like it. Then used the instructions that I'm about to give you on how to save your work, so keep going up and applying filters. There was another one that I wanted to show you. Deck or oh, slide. Check this out. This is for making borders so it makes a new image with a little sprocket marks on it like it's a piece of 35 millimeter film. And once again, if I don't like it, just click. Discard the the changes. So that's applying. Effects basically go down through filters. There's various distorts. Aiken turned a newspaper. Let's see what newspaper does I hope? My gosh, that's really going to make it look strange. Uh, that's not too bad. So go in and use filters. Try applying the effects use, undo and destroy windows to remove the effects. If you like them, see what double effects dio and then save your work as I'm about to show you. 6. Adjust Colors and Brightness: I'm afraid than in this lesson, I'm gonna have to embarrass myself by admitting that I don't use color rising of images very much. I've never quite understood how to touch them up or what makes them look better photographers or better at this. But I'm gonna show you how you do it. He used the colors menu. Now let's say we want to adjust the color balance. What this does is it gives you the various colors and I can just mid tones or highlights and notice as I, for instance, go a little red. The image starts to turn a little red and then it turns very red and it gets very weird. I could make myself look like I'm Sunbird, But if you're missing some red tones in your image, bring them up the same with magenta to green. I don't know about adding green to your face yellow and blue yellow would actually, and that doesn't look too good and blue tones so you can control those. The next thing that I want to point you to is contrast and brightness of your image is too bright. You could bring down the brightness and kind of mellow it out a little, make it a little darker. You can also adjust the contrast here. We want, you know, maybe high contrast. You can make things pop out a little bit. Usually the secret using these controls is to use them as little as possible. But go ahead and adjust things. Just cancel if you don't like it or say okay to apply. So let's go and do that colors again, or the brightness and contrast. I actually like this with a little more contrast and a little less brightness. There we go. It makes the colors on my face come out a little better. Now we're gonna go up two colors, curves, a lot of play. People play with the color curves, and I never quite understand what's going on. But I do notice that as you drag this curve around, for instance, here we're making the image lighter. By dragging it up here, we're making it darker, and we can pick certain background tones and foreground tones and so on so we can actually darken up this image and really make the colors come out. Now. I don't know if I made this image better or worse. It's easy enough to do an edit, undo curves and then an edit. Undo brightness and contrast. You know, this was a little faded. I'm gonna do an edit, redo the brightness and contrast, and I didn't like the results of the next effect. Was that the curves? So I'm gonna leave it at that anyway. That's the way that you and just the color balance and the curves, brightness and contrast. There's another thing called color rise, where it actually puts everything in here. I can change the hue or color from a red toe purple two green and apply of pretty fanciful colors. Aiken de saturate the image entirely and make it black and white. I can change its brightness and so on, so if you need to adjust your image to bring out a little more color to darken it down to change the contrast, use the colors, options, color, balance, colorize brightness and contrast and curves 7. Export Your Work: Well, that's all. Thanks for taking the class. I'll see you in the next class. What's that? Oh, yes, that's right. We've got to talk about how to get all of this lovely imagery out of the gimp and into your hands. And what better picture to do this with than my brother's lovely picture of Yosemite in the California, the United States? This is one of our public parks that's one of the most beautiful. It's by my brother Drew Jackson, who's a professional artist. Far be it for me to try and touch up his photo, but I will use his photo now. Normally, I would save this file as an ex CF or a gimp internal file. But since it's a modified photo revenue complex image, I'm just going to go ahead and export it by using file export as and here I get to specify a name in the directory. I'm gonna put it in my pictures directory where I put most of my pictures, and I'm gonna go ahead with the default name of Yosemite J. Peg noticed that the J. P. G means that it's a J peg image. This is a very popular output format. Another popular at foot format is PNG, so use one or the other of those two. Output your image. I use J. Pegs most of the time, and I say, Export, I happen to have a copy of this image there. Go ahead and replace it and it asks me for my resolution there. And that's how toe export your work from the gimp the last step. 8. Gimp for Beginners to Intermediate, Photo Manipulation, Correction and Touch Up: first, I want to thank you for taking my class. Next, I want to encourage you toe upload your own beautiful picture to your class project. Now, in this class, we learned to use the gimp. More specifically, we learned how to open a photograph in the gimp. Rotate, flip, resize and crop. Remove red. I removed blemishes and unwanted sceneries, said color, brightness, Contrast, hue and saturation add to image effects and finally export our work so that you could create lovely photographs like this. Now, if you want to take the rest of the course in my class, just go and search for a gimp for beginners on skill share or look at the class description for this class for a list of all of the courses in the Siri's again, I want to thank you for taking the class and I'll see you in the next class.