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Meta: upscale
post #1340614 post #1050372 post #1003461 post #902358
In order: Bilinear, nearest-neighbor, waifu2x, nearest-neighbor on pixel art.
To artificially increase and modify aspects of uploaded content. By definition, content under this tag is discouraged to be uploaded on this site. As upscales are generated from the original file using computer algorithms, it means that it can be done again from original file, but original file is impossible to obtain from upscale.
If you have upscaled images, please keep them for your own personal usage. The only case they would be acceptable here is if the upscale is the only version available of the post or the artist himself did it, but it's still highly discouraged.
Resolution
Most common form of upscaling. There are several algorithms which can be used to make an image larger, the most common general purpose ones are bilinear and lanczos and the most popular with drawn content is waifu2x.
To distinguish upscale from original, you should carefully inspect both files. If general upscalers are used, the whole image will usually look really blurry. If more advanced upscalers are used, then parts of the image that don't have enough data will look blurry, e.g. really thin line endings.
The only lossless upscaling resolution method is nearest-neighbor (also known as "no filter" upscaling) with whole multipliers. On this site, this method is only acceptable with pixel_(artwork), where 1:1 pixel ratio will look tiny on modern monitor resolutions. But with other types of artwork this method will cause unwanted aliasing. Every other upscaling method is subject for deletion if there isn't a good reason for said upscale.
Frame rate
Frame/Motion Interpolation is a form of upscaling, but it has several other names. It means taking two existing frames from a video and then estimate what could happen in between them. This means that instead of seeing two frames on top of each other, there's usually a slightly blurrier frames in between existing ones and sometimes if the prediction goes wrong (e.g. sudden high amount of movement), you can see morphed frames of two frames blend. (example: post #917295 from 0:23 onwards).
Frame blending is a common occurrence if the frame rates don't match when creating a video and the end frame rate is larger than original. Normally with this you can pause the video and have 50% chance of seeing two frames on top of each other.
Modern TVs usually have this technology (motion interpolation) implemented in with regular presets outside gaming mode, so usually with the models all you need to do is watch the video regularly. On PC, it's possible to use a software which does this on the fly (see related links).
Related Links:
- Wikipedia's Article about Image Scalling.
- Wikipedia's Article about Motion Interpolation
- SVP, a Real-time Motion Interpolation Software
