How to sharpen in Photoshop for figures and plates. CAREFUL! Sharpening must be reported to publisher, but it is valuable for poster presentations and talks.
How to Sharpen in GIMP
• Unsharp mask is found under Filters > Enhance > Unsharp Mask.
• No Blend/If layer function found.
How to Sharpen in Image J
Under Process > Filters > Unsharp Mask. Type in values iteratively while looking at preview.