In this tutorial, we are going to learn how to create a Fisheye effect using Ellipse Select Tool and Lens Distortion filter that comes with GIMP.
A Fisheye lens is a wide-angle lens with a convex shape capable of capturing images with an angle of 180 degrees so that it can produce images with a distorted circular shape. This type of lens was developed by Nikon in 1935.
Final result.
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For this GIMP tutorial, I'll use this image, 384566.
Step 1: Draw Circle Selection
After opening your base image in GIMP, grab the Ellipse Select Tool from the toolbox or use Tools> Selection Tools> Ellipse Select (E).
In the tools options tab, check “Fixed aspect ratio” to keep the circle selection doesn't distort. You can enter value 30 for Feather edges Radius to get a smooth selection.
Click and drag your mouse to choose a portion of the document. Just leave the mouse when you are done. You should see a dotted line or marching ants outline the selection. Now, the selected portion of the document, in a circle, has been picked or selected. If you want to move the selection, click anywhere inside the selection and then drag to the position you want.
Step 2: Invert Selection
Use Select>Invert to inverts the circle selection in the current layer.
Now all of the layer contents which were previously outside of the circle selection are now inside it.
Step 3: Fill Selection With Black
Use Tools>Default colors or press D to reset the foreground/background color to default.
Now fill the selection with black by going to Edit>Fill with FG color.
Now black color fills the active layer selection.
Step 4: Invert Selection Again
Use Select> Invert to invert the selection. Now the circle portion of the document selected.
Step 5: Apply Spherize Filter
Use Filters> Distorts> Spherize. Check “Preview”, set the settings until you’re happy with the result. Click OK when you’re done.Step 6: Crop Image
Use Image>Crop to Content. The image gets cropped now.
There you have it! How To Create Fisheye Effect in GIMP
Step 7: Save it
Use File>Save (or Ctrl+S) to save your project file. Navigate to the folder where you want to store your project file. Type a name in the Name text box and leave the default GIMP (*.XCF) format. XCF is GIMP's native format and is useful because it stores everything about your image and will allow you to later edit your image in GIMP, in case you notice a problem. Click Save to store the project file.
Step 8: Export Image to JPG
Once you have finished, you will probably also want to export the image in a more widely used format, such as JPEG, PNG, TIFF, etc. Use File>Export As... Type a name and its extension like .jpg then click Export.
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