![]() Once it’s active, you can click and drag the image from the corners. To do this in GIMP, you can use the Perspective tool. If there’s a house, a building, or trees in your photo, you may need to correct the perspective of the image. If you don’t know the value, simply move the sliders until you’re comfortable with how the photo looks. This works with Kelvin degrees, so you should move the sliders to achieve the value that you want. You can also adjust the color temperature by going to Colors > Color Temperature. You can make these adjustments on the overall photo when you set the Channel to Value or do them on each color channel separately. If you slide the levels inwards, you’ll have less contrast. Then, with the Output Levels, you can determine the pure white and the black. Using the Input Levels slider, you can adjust the mid-tones, shadows, and highlights. Now, you can fine-tune the adjustments with the Levels tool. You can also do this using the Brightness-Contrast feature. Here, you can use the Black level slider to adjust the contrast and the Exposure slider to make it brighter or lighter. Depending on the version of GIMP that you’re using, you might not have this feature. To do so, you can go to the menu Colors > Exposure. The best way to enhance photos is by fixing the light. Otherwise, move on to the Shadows and Highlights. With some images, you only need to adjust the Color Balance here in the mid-tones – if this is your case, just hit OK. You must have the Preview option checked so you can see the adjustments in real time. You can also do it using the Hue-Saturation feature. I like to change the blending mode to Soft Light if the image looks washed out, but you can leave it to Replace. What you’ll need to adjust will be different in each photo, but usually, the mid-tones are a good place to start. Start by duplicating the layer so that you can preserve the original image in case you don’t like the edit. Once you’re happy with the crop and composition, hit Enter. Then, when you click on the image and start dragging the cursor, you’ll see the guidelines that will help you to improve the composition. Open the menu and choose the composition overlay that you prefer. The last drop-down menu, by default, is set to “No guides”. While the crop is active, go to the bottom of the options panel. When you’re happy with it, click Enter to apply. Now you can click and drag on the photo to select your crop. ![]() Underneath, you’ll see the icons for portrait and landscape orientation – click on the one you want. Then, check the option Fixed and choose Aspect Ratio from the drop-down menu. To do this in an easy and precise way, go to the tool options. You can maintain the original ratio or change it.Ī common reason to crop an image is to change its orientation from portrait to landscape or vice-versa. You can use the free crop tool to cut out unwanted elements on the edge, zoom in, or fit a specific size. If you want to start a new crop, simply click outside of the image. However, if you click and drag one of the corners, both height and width change together. Instead, if you move the top or bottom edges, you’ll be changing the height. ![]() When you move the left or right edge, you’ll be changing the width. When any of these areas are active, click and drag it. Then, you’ll see a yellow square or rectangle that indicates the area or corner you’ll be adjusting. Otherwise, you can modify the cropping area by hovering over an edge or a corner. If you’re happy with the crop, simply hit Enter to apply it. When you release the button, you’ll see an overlay that darkens the area that will be cropped out. In the Channels list, right click and Channel to selection to make a selection from the result.When the cropping tool is active, you can simply click and drag over the area you want to keep.Use the Threshold tool to remove the gray band.At that point the saved channel is the "active drawable" and so the Paint tools will act on it. Select>Save to channel to save the selection.Layer>Transparency>Alpha to selection to generate a selection base don transparency.Click on the white part (this acts as a "Select by color" on the selection values) and this should restrict your selection to the fully opaque bits.You will get a "negative" of your image (white is what is fully selected, and the "Alpha to selection" selects pixels according to their opacity). Select>Selection editor to open the selection editor.Layer>Transparency>Alpha to selection to generate a selection based on transparency.Because it selects by color, and the difference between the black area and the near-black area is not color but opacity (you can use the Pointer dialog to check this).
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