Pixels

Resolution

Cropping

Resizing

Graphic File Formats

Changing Quality

Enhancing Colours

Using IrfanView

Using MS Photo Editor

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Changing Quality

 

Changing Quality
JPG format images can be compressed to a smaller size in KB. However this involves a loss of quality as information is lost.
Once that information is lost it cannot be retrieved.

Original Photo 100% Quality (31 KB) 80% Quality (13 KB)
60% quality (11 KB) 40% Quality (10 KB)
20% Quality (6 KB) 10% Quality (4 KB)
5% Quality (3 KB) 1% Quality (2 KB)
It can be seen that an image can be reduced quite significantly in KB size without any obvious deterioration in quality as seen by the naked eye.

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