Proposal for corrected_aspect_ratio metatag

BUR #50166 has been approved by @nonamethanks.

mass update pool:23084 upscaled -> -upscaled meta:corrected_aspect_ratio
create implication corrected_aspect_ratio -> resized

The comics in pool #23084 (all mostly SFW) were resized by me from game assets with a bad aspect ratio. I created topic #28298 to ask whether it would be okay to upload them and how I should tag them. I was told my proposed method make sense, that uploading them would likely be justified given the circumstances, and that upscaled should be fine for those posts. I plan to do the same with the Alternative Girls card art we don't have yet in the near future (a lot of them don't have high-quality images online), but I want to try and resolve something about the metatags first.

I don't believe the upscaled tag should be used for images in which the aspect ratio was corrected. Normally, when I think of an upscaled image, I think of both dimensions being increased proportionally to increase the resolution without changing the aspect ratio. But the purpose of correcting the aspect ratio is to restore an image to something close to how it originally looked, not to make it look bigger on a screen.

Sometimes, the only way to obtain high-quality art from a game is to extract an asset with a bad aspect ratio and correct it. This is the case with the aforementioned comics and a lot of Alternative Girls card art, in which the only images available online are low-quality in-game screenshots, meaning the asset would be resized in-game anyway. Basically, it's easier to justify changing the aspect ratio than making an image bigger. Thus, I don't believe we should conflate the two.

While it's not the same as upscaling, it is still resizing the image, so I believe it should still count as a third-party edit that would be allowed only under certain circumstances:

• There is no other version of the image that is of comparable quality available.
• One dimension is made larger while the other is kept the same.
• An appropriate filter is used to prevent aliasing.

I tagged upscaled on the comics I resized. This BUR will replace the tag on those posts with corrected aspect ratio and make it a metatag. I chose this name to make it clear it's a correction and because "fixed aspect ratio" means something completely different. I know it's a bit long, so I'm open to alternatives.

The bulk update request #50166 (forum #396572) has been approved by @nonamethanks.

Bumping this because there was a scenario I hadn't considered (WARNING: Major pedantry ahead).

In some cases, it is impossible to get the exact aspect ratio without upscaling both dimensions. For example, the images for Toaru Majutsu No Index: Imaginary Fest are 1024x1024, but displayed in a 16:9 aspect ratio. For the aspect ratio to be exactly 16:9 while keeping the height constant, the width would need to be exactly 1820.4̅. The closest we can get is 1820, which means the image would be horizontally squashed by 4/9ths of a pixel.

It's possible to get exactly 16:9 by making the size 1084x1026, which means the "second" dimension needs to be increased, but only by a couple of pixels. While it does technically mean there would need to be some interpolation along that dimension, the effects are just as imperceptible as the half-pixel squish when keeping the height constant.

So yeah, in an effort to establish best practices for something that would only apply in specific circumstances like unsquashing square game assets, I'm basically trying to figure out which of two extremely minor flaws that the vast majority won't notice or care about is "better" to have. I warned you this would be incredibly pedantic.