change realcugan tilesize

[kingvall]

具体描述

Hello,
'realcugan' tends to create chromatic aberration when the 'tile size' setting is too low. You can see an example in the attached images (note the purple chromatic aberration at the bottom of the page).

To resolve the issue, simply increase the tile size (in the second image, I set it to 512 and there are no more problems).

I found a code section with the options:
// 为了省事，就不支持调整参数了 // 不会支持透明图片，处理起来太麻烦了 // 代码均抄自 // https://github.com/xororz/web-realesrgan/blob/f81d2dd7935ee8df947674933fd41a446b90e911/src/worker.js // 只删去了因参数固定而变得冗余的代码 // // 模型文件在 Releases 下载 // // https://cappuccino.moe/realcugan/2x-conservative-128/model.json const factor = 2; const input_size = 128; const min_lap = 12;
But the selected model seems to be locked to a size of 128. Setting the variable to 512 triggers the following error:
Uncaught (in promise) Error: The shape of dict['input'] provided in model.execute(dict) must be [1,128,128,3], but was [1,512,512,3] at F$ (<anonymous>:19:171470) at <anonymous>:19:906648 at Array.forEach (<anonymous>) at e.value (<anonymous>:19:906413) at e.value (<anonymous>:19:898437) at e.value (<anonymous>:19:915549) at e.value (<anonymous>:19:912946) at <anonymous>:106:38 at <anonymous>:19:220203 at e.value (<anonymous>:19:220344)

Do you think it would be possible to allow users to change the Tile Size?

[hymbz]

It's not that it's impossible, but it's a hassle, and I don't think it's necessary.
The reason you encounter an error after setting the variable to 512 is that web-realesrgan requires different models when using different parameters (you can verify this by downloading the compressed file from web-realesrgan's Releases). Because there are so many combinations of parameters, the size of the compressed package is over 200 MB. However, for simply upscaling manga images, using a fixed parameter is perfectly sufficient (in my opinion), and this way you only need to download a 2MB model.

[hymbz]

After enabling the image upscaling feature, were you prompted with Unable to upscale images using WebGPU, processing will be slower? If it weren't for On WebGL, larger tile sizes can make your device appear to lag during execution, the Tile Size should ideally be set larger, which would also speed things up.
I think the code could be modified like this: when it is determined that WebGPU is available, set Tile Size to 512 and use the corresponding model; otherwise, use 128.
This would effectively accelerate image upscaling on devices that support WebGPU. And if your device supports WebGPU, this would also solve your issue.