Spatially resolved transmittance map of samples obtained by wide-field, ballistic, and total transmission measurements at selected wavelengths. Wide-field transmission images using 4900k white LED and 1552 nm, ballistic transmission at 911 nm and 1300 nm, and total transmission at 514 nm and 630 nm of Danionella skin, mouse skull, mosquito cuticle, wasps cuticle, and rat dura are shown. Scale bar = 200 µm. The colors represent transmission from 0% to 100% at different spatial locations on the samples.