ImageQ[Image[pixels]]True if pixels has dimensions from which an Image can be constructed, and False otherwise.ImageQ[Image[{{0, 1}, {1, 0}}]]
ImageQ[Image[{{{0, 0, 0}, {0, 1, 0}}, {{0, 1, 0}, {0, 1, 1}}}]]
ImageQ[Image[{{{0, 0, 0}, {0, 1}}, {{0, 1, 0}, {0, 1, 1}}}]]
ImageQ[Image[{1, 0, 1}]]
ImageQ["abc"]