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I never used Irfan but I tooked a quick look now.
1. CTRL-R (Or choose Resize/Resample... under image menu)
Set size width to 800 pixels.
2. SHIFT-S (Or choose Sharpen under mage menu)
I saved as .jpg with the standard quality setting (80) and got 96Kb. If you pic get more than 100Kb, lower the quality setting.
The result look fine and no blurring.
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