I need to export my images (especially AI generative artworks from Midjourney), with the EXACT SAME resolution that I imported them in.

Bug: original image res: 2816x1408 png (4.5MB)

Export (jpg) res/bug1: 3168x1584 jpeg (882KB)

Export (jpg) res/bug2: 3168x1584 jpeg (897KB) - with signature

Export (png) res/bug3: 3168x1584 png (4.4MB)

Export (png) res/bug4: 3168x1584 png (4.4MB) - with signature

Desired Outcome:
Input Res: 2816x1408
⇄
Output Res: 2816x1408
(both file types; also with signature)