Digital Security: basic information.
Hello! This is the first part of the serie "Digital Security".
Here you can clik in the issues to go to the post of this only issue.
The issues are:
- Malware or Virus in your phone.
- Public connections.
Digital image: excercises 41 and 42
41. Think you want to print out a photograph with a size of DIN A4: 210 X 297 mm maintaning maintaining a printing quality of 200 dpi. Which resolution would the image need? 8.27"X 200 dpi = 1,654 pixels of tall. 11.69"X 200 dpi = 2,338 pixels of long. Total resolution = 1,654 X 2,338 = 3,867,052 pixels = 3.87 megapixels. 42. W hich resolution would the same picture need to have a 300 dpi 8.27"X 300 dpi = 2,481 pixels of tall. 11.69"X 300 dpi = 3,507 pixels of long. Total resolution = 2,481 X 3,507 = 8,700,867 pixels = 8.7 megapixels.
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