How to avoid chromatic aberration when taking pictures? I have seen some sellers posting pictures of hundred-dollar bills at the same time. Does it really work? I don't think it's going to work.

The problem of color difference is too complicated, and the whole process from shooting to watching is possible. Whether the light source is pure (if you shoot something with yellowish light, it will definitely have chromatic aberration)-whether the white balance of the camera is accurate-whether the color imaged by the camera is accurate-whether the display of the post-processing display is distorted-whether the color space used in post-processing is consistent with the viewer's machine settings-whether the white balance control color control in post-processing is distorted-whether the display of the viewer's display is distorted. The purpose of posting common pictures of banknotes is to let viewers judge for themselves whether their monitors can display colors correctly. However, it is hard to say whether the color of this banknote picture is accurate, so I can only do my best. Put the white paper together, and you can use the white balance tool to define the white paper as a white field later, which can correct the color deviation to some extent. If it is better to put a neutral gray card, define it with a medium gray straw.