In photography, a very dark person and a very white person take pictures together, which will make the very white person overexposed and invisible. What is the principle? Bai ping

Generally, cameras need exposure when shooting white objects, and reduce exposure when shooting black objects.

When blacks and whites stand together to take pictures,

If it is spot metering, then focusing on blacks is overexposed to whites, and focusing on whites is extremely dark.

Therefore, it is necessary to use central focusing photometry or multi-area evaluation photometry, and then focus on taking photos after locking the exposure value.