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1

Just use one of the filters in filters/edge-detect - with some extra actions until you get what you want. What I did here: duplicated the layer, cut out the oceans (I don't know if it is your intention) by clicking on one by one with the magic-wand, right click on the layer in the layers dialog, add alpha channel, then edit->cut. After that, , ...


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To rotate an object in Gimp (here 2.8.) using the rotate tool we have to add it as a "Floating Selection", or we make any selection (which can also be the whole image) float with Select > Float (or Shift+Ctrl+L). We can then move the center of rotation by dragging it with the mouse to the desired postition, or by giving the exact coordinates relative to the ...


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The fastest way I can think of: Select your selection tool (rectangle select or circle select) It isn't necessary to do this first, but it's necessary for step two. CtrlA to select all Enable Fixed in the selection tool options: Click on the selection to make the scaling handles appear, and scale the selection


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A straightforward way to do this is: Start with the base image (in its default layer). Add a new layer (with Layer Fill Type "Transparency"), and make sure it is selected. Set the foreground color to white. Select and fill the rectangle you want with the foreground color (white). Set the 2nd layer's opacity to 75%. Set the foreground color to black. Add ...


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You need to do that in 2 steps, background first, then, write your text. Without layers : 1) make a rectangle selection and increase luminosity 2) write your text over it. With layers (better) : 1) make a new empty layer 2) draw white rectangle then either 3a) change layer opacity (easy) or 3b) add an alpha mask and fill it with gray 4) write ...


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FYI: I don't believe any sort of translucent effect is occurring there. It looks to me like a simple white box is placed over the image and under the text at ~75% opacity. To achieve an actual translucent effect, do the above but also select the area of the image covered by the box and apply a blur to it at whatever settings you find appealing.


3

GIMP has an invert command you can apply to RGB and Grayscale images: to You can acces it through Colors → Invert.


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We may be talking about a scanned color negative film stock widely used way before the invention of digital cameras. These images had a yellow and a red mask for color absorption. Hence negatives had an orange rather than a white tint: Image source: Wikipedia cc To obtain a positve color image from these sources we have to Remove the orange mask ...


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You have to add a layer mask. (Right click on Layer → Layer Mask → Add alpha channel of the layer) And then can you use the gradient tool Here is an tutorial with pictures. http://infofreund.de/gimp-transparent-gradient/


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In GIMP, the most precision I got for panning (positioning the Canvas on Screen) is about 8px - if you click and keep pressed on the pan button at the right of the horizontal scrollbar (which pops up a miniature of the image for navigation ), and then use the arrow keys instead of the mouse cursor. But according to your comments, maybe centering and fixing ...


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Your image is not black-on-white; it's all black with variable transparency. When you tell GIMP to select only the black pixels, it will select all the pixels, except those that are fully transparent, since as far as GIMP is concerned, those pixels are all black. One way to make it work as you seem to expect (i.e. only select the pixels that are 100% ...


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Under 'Tool Options' of 'Select by Color Tool' set the 'Threshold' slider to 0, it will only select exactly the same colors.


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Those flares around the sun are made using fractal IFS flames, most likely using Apophysis - it is also available on Gimp under Filters > Render > Nature > Flame ... Hit 'Edit' and select the spherical variation and you should get similar flares. Hope this helps.



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