Hello,
As someone well-versed in both digital and film radiography, it's essential to understand that these methods are primarily used to detect fractures, solid foreign bodies, or abnormalities such as air pockets, especially in cases like gastric torsion in dogs. However, when it comes to soft tissues like the penis, they typically appear as faint shadows or may not be visible at all. In this context, an ultrasound might offer better visualization, though the area to be examined is quite small, usually just a few square centimeters. As for MRI, while it provides superior resolution of soft tissues, a simple photo wouldn't suffice for proper interpretation. It's also worth noting that radiographs and other imaging techniques don't produce color.