[FEATURE] Custom Width

[njardim]

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First of all, congratulations on a great program! Keep up the good work.

I would like to request a new custom feature, and it's the ability to also specify the final Custom Width of an image instead of just relying on the current Model Scale, or Custom Scale Factor to upscale images.

Detail | 详细描述 | 詳細な説明

This is important because if we are batch upscaling hundreds of images with different sizes from a folder, and we need to normalize the final width for all images, let's say to 3840px, then with the current Model Scale, or Custom Scale Factor, all images are upscaled relative to their original image size, and what we need is to upscale all images to a specific width, no matter the original image size. The height of all images should be adjusted automatically based on the specified custom width.

This allows a greater degree of flexibility while upscaling images.

Thank you.

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