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Digital image: the class activities 41 & 42

41.- Think you want to print out a photograph with a size of DIN A4: 210 × 297 mm maintaining a printing quality of 200 dpi. Which resolution would the image need?

The size is in mm. It must be converted to inches since the quality (DPI) is expressed in dots per inch.

1mm = 25.4 inch

The resolution of the photograph is 1653.54x2338.58 = 3866.940 px ≈ 3.9 megapixels

42.- Which resolution would the same picture need to have a 300 dpi picture?

The size is in mm. It must be converted to inches since the quality (DPI) is expressed in dots per inch.

1mm = 25.4 inch

The resolution of the photograph is 2480.31x3507.87 = 8700.615 px ≈ 8.7 megapixels

Digital image

Diagram of digital image properties.

Security issues: use public Wi-Fi connections

My brother always uses public conections, like public libraries or cultural centers, to do his online works. He has an important job and manage sensible information about clients and business. I think this is not a good idea to use public wi-fi connections to do so… What do you think and why...

I think that is not a good idea because it has a lot of problems.

Some of the problems with public Wi-Fi connections are:

• Many public Wi-Fi access points are unencrypted networks that transmit data in plain text, allowing cybercriminals to access the information you transmit, including passwords, banking data, emails, and other sensitive information.
• Man-in-the-Middle (MitM) attacks: In this type of attack, a third party intercepts the communication between two parties and pretends to be both without either side knowing. This allows the attacker to steal confidential information or even alter the transmitted data.
• On a public Wi-Fi network, there's a risk of someone impersonating a legitimate network to deceive users and steal their information.

        Tips for Connecting Safely

1. You can use a VPN, which encrypts your internet connection and protects your information.

2. Avoid accessing sensitive information while on public Wi-Fi.

3. Only connect to websites that use HTTPS.

4. Disable file sharing and Bluetooth to reduce the chances of other devices connecting to yours without permission.

5. You can use an antivirus software.

Here’s a link with more interesting information.

👉 Vote for your favorite tip

Security issues: Do you always use the same password?

I always use the same password for all my accounts and applications. I do not like to use complicated passwords because it is difficult to remember and too long. What do you think?....

Using the same password for all your accounts and applications is a very dangerous practice, although it’s quite common.

Some problems with using the same password include:

• If one account is hacked, attackers might try using that password to access all your accounts (this is called credential stuffing).
• Data breaches are very common. If your password is included in one of these breaches, anyone with access to that data could gain access to all your accounts.
• Even if your password seems complex to you, if it’s short or common, like "Password123," attackers could guess it using automated methods.

        Possible Solutions

1. Use a password manager: It stores your passwords securely. You only need to remember one master password, and the manager will create and remember unique, secure passwords for each account.

2. Create unique passwords with things you like, like soccer players, cars, etc

3. Enable two-factor authentication: Adding a second verification step (e.g., a code sent to your phone) can protect your accounts even if someone gets your password.

4. Use phrases instead of words: Instead of a hard-to-remember password, use a full sentence. For example, "Today’sCoffeeIsVerySweet!" These are easier to remember and harder to guess.

5. Change your passwords frequently to prevent potential hacks.

Here’s a link with more interesting information.

In my opinion, I understand that complicated passwords can be hard to remember, but it’s worth taking some time to improve your digital security.

👉 Vote for your favorite solution

Mains parts of the computers

Parts of the computer:

• Cpu cooler
• Memory
• Graphic card
• Hard drive
• Power supply
• Case

CPU Cooler

A CPU Cooler is a device designed to draw heat away from the system CPU and other components in the enclosure. Using a cooler to lower CPU temperatures improves efficiency and stability of the system.