If you simply need a clear microscopic photo for a school project or personal record (not diagnosis), follow these steps using a standard editor like Adobe Lightroom (Mobile/Desktop) or GIMP:
Sperm are translucent. A standard "auto-tone" button often washes them out. You need a histogram tool where you can manually stretch the shadows and highlights without losing the tail detail. sperm photo editor best
You cannot use a standard photo editor to "improve" a sperm analysis photo because: If you simply need a clear microscopic photo