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| Super Resolution |
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Posted by: Occasionnel - 03-22-2021, 01:44 PM - Forum: General questions
- Replies (2)
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Hello
I am occasionnaly worker with GIMP and I am generally use it for photography.
I will need to generate a very large image full of pixel and I discover a tuto for PS:
Something like that with some actions I don't know in GIMP
- Bring all images into Photoshop as a stack of layers
- Resize the image to 200% width and 200% height using 'Nearest Neighbor'
- Auto align all the layers
- Average the layers by setting each layer's opacity to 1/layer number (the 1st layer will be 1/1 so 100% opacity, the 2nd layer will be 1/2 so 50% opacity, and the 4th layer will be 1/4 or 25% opacity, and so on).
- Sharpen the image using a Radius setting of 2, and a suitable Amount setting (we used 200% for the 4 image stack and 300% for the 20 image stack – the more images you stack the more amenable the composite will be to aggressive sharpening)
Alternatively, for the fourth step you can convert all layers to a 'Smart Object' and change the stacking mode to 'Median'. This can help deal with ghosting from movement in your final image, but can also take longer to process.
So looked for the same with linux tools (Gimp) but not able to find it out.
Is the smart object or other options that not permit to do the same ?
Thanks you all
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| Preserving HDR information in EXR output from Blender in a 8-bit PNG? |
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Posted by: Mixxer - 03-22-2021, 07:34 AM - Forum: General questions
- Replies (3)
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The only way to get the full dynamic range out in a render or bake is to save it as an EXR float from Blender. Not even saving 16-Bit PNG float will keep all the information in the highlights in Blender. But many applications call for another format other than EXR. Such as PNGs and even Jpegs.
So is there a way to compress the full dynamic range information from the EXR into a 8-bit PNG using Gimp? So basically all the HDR info in the EXR file can be seen in a 8-bit PNG and the highlights are not blown and the shadows are not crushed. In video, Log does basically that. Squeeze the dynamic range which normally couldn’t be handled by Rec709 into rec709.
Anybody knows how to do that with EXR to 8-bit PNG in Gimp? Again, I’m aware of the limitations of 8-bit PNG, but this is what I need to output to. So my question is really how to compress the dynamic range to fit the 8-bit limit.
Thanks
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