This look is most likely caused by significant underexposure, not true “extra saturation.” When film is underexposed, the lab or scanner often tries to brighten the image, which can produce strained colors, exaggerated grain, low contrast, and weak blacks.

Things to check:

• ISO setting: make sure the camera is set to the film’s actual ISO.
• Metering: the OM-4 has a built-in meter, so confirm you’re using it correctly and that it seems accurate.
• Battery: if the battery is dead or weak, exposure operation may not be reliable.
• Camera mechanics: a sticky aperture diaphragm or shutter problem can cause less light than expected.
• Exposure mode/settings: if you shot manually, re-check shutter speed and aperture choices.

A good diagnostic is to inspect the negatives:

• Nearly transparent orange negatives suggest strong underexposure.
• Very dark negatives suggest overexposure.

You can also compare the OM-4’s suggested exposure with another camera or use the Sunny 16 rule as a sanity check in daylight. Overall, the sample image description points to underexposure with the lab/scanner compensating for it.