- Get a computer that is connected to a scanner
- Double-click on the scanner looking thing on the desktop
- Choose the resolution desired on the left hand side
- Place image onto scanner
- Click Scan
- Choose destination
- Save
- Done
Descreening reduces the amount of interferences (moire pattern) in a scanned image. It is important as it reduces the quality and clarity of the image, making it less visually appealing. The scanner I used does not have a descreen setting.
From the following images, I concluded that 75 DPI is enough for web as these images rarely needs to be viewed in such detail and upload time increase accordingly to size. 150 DPI is best for presentations as it is clear enough to show details but it is small enough to not take excess loading time, which can prolong the presentation too much and allowing attentions to drift away. 300 or more DPI are best for printing as it creates a better image when printed, and its size will be too big to do other things anyway.
These are 3 different resolution of the same image. All colour mode are RBG.
150DPI
75 DPI
75 DPI
300 DPI
75 DPI
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