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Showing results for tags 'motion blur'.
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I decided to have a little fun with what otherwise was a boring photo of a passenger train at a level crossing. To get this effect in Affinity Photo, I duplicated the photo layer. Then I added the Motion Blur filter to the top layer (Layer > New Live Filter Layer > Blur > Motion Blur). I selected Radius: 72 px, Rotation: 0, Blend Mode: Normal, Opacity: 100%. Preserve Alpha is checked. Next I selected the Erase Brush tool, and erased the blur to reveal the original train photo on the layer below. I played with the size of brush until satisfied. The front is not perfect. Playing with Preserve Alpha checked and unchecked makes a difference, perhaps adding a bit too much blur. It's all subjective, right? Before digital, getting an image like this would require panning at a slow shutter speed to blur the background while keeping the moving subject in focus. Then wait for the film to be developed. Original NRW (RAW) image was made with the Nikon P7000 compact camera.
When applying a non-destructive Motion Blur filter and nesting them into a layer (tested with text layer), screen updates are confined to the bounding box of the original layer, even if the radius setting will make the result expand beyond the original bounds. Moving the result around will leave artifacts behind that can be cleaned up by forcing a redraw (eg. by toggling visibility on a layer that covers the entire document). Version is Photo 1.6.6 App Store build, Renderer set to OpenGL, Use Precise Clipping off, OS X 10.11.6. I've also had issues with the preview clipping the motion blurred result to the alpha of the base layer despite "Preserve Alpha" being off, but I cannot reproduce this after a reboot, even with the same document.