The “biggest” change is A7→ AB for the middle’s blue channel (4 units). However, since JPEG uses YCbCr 4:2:2 (¼ as much resolution for the two color channels that encode hue and saturation in a linear way) by default and blue is only ⅙ of a contributor to lightness as green, it’s explicable without malicious intent by the OOP.
The “biggest” change is A7→ AB for the middle’s blue channel (4 units). However, since JPEG uses YCbCr 4:2:2 (¼ as much resolution for the two color channels that encode hue and saturation in a linear way) by default and blue is only ⅙ of a contributor to lightness as green, it’s explicable without malicious intent by the OOP.