CHART: About digital images

 

Digital image problem 2

 Second problem:

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

Step 1: Convert millimeters to inches

We know that:

$$1 \text{ inch} = 25.4 \text{ mm}$$

Convert each dimension:

• Width:

  $$210 \div 25.4 = 8.267716535 \text{ inches}$$
  

• Height:

  $$297 \div 25.4 = 11.69291339 \text{ inches}$$
  

Step 2: Multiply each dimension in inches by the desired resolution (300 dpi)

• Width in pixels:

  $$8.267716535 \times 300 = 2480.31496 \text{ px}$$
  

• Height in pixels:

  $$\mathrm{-\; 11.69291339}\times 300=3507.874017\text{ pixels}$$

• Final required resolution: 
• 2480 × 3508 pixels

Digital image problem 1

First problem: 

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?

To find the required image resolution:

Step 1: Convert A4 dimensions from millimeters to inches.
1 inch = 25.4 mm

• Width: $210 \div 25.4 \approx 8.27$ in

• Height: $297 \div 25.4 \approx 11.69$ in

Step 2: Multiply by desired print DPI (200 dpi).

• Width: $8.27 \times 200 \approx 1654$ pixels

• Height: $11.69 \times 200 \approx 2338$ pixels

  Required resolution at 200 dpi: 

• 1654 × 2339 pixels

Cyber security problem 2

-  I think my telephone has a type of malicious software that makes me believe that my cell has a virus. Sometimes, it will fool me into believing that my security measures are old. In turn, they offer new updates for my security settings. So I do not know what to do… 

- Information about the problem

1 . Run a reliable security scan & remove suspicious apps:

Install a well-known mobile security or antivirus app (from the official store) and run a full scan. Then uninstall any apps you don’t recognise.

- Run a reliable security scan & remove suspicious apps

2. Clear browser data, caches, and restart in safe mode:

Malware sometimes works via browser pop-ups or hidden apps. Clearing browser history & cache helps. On Android you can reboot into Safe Mode (which disables third-party apps) to check behaviour.

- Clear browser data, caches, and restart in safe mode 

3. Check for fake alerts/scareware and avoid clicking on them: 

What you’re describing (pop-ups telling your security is out-of-date, prompting you to install something) often is a malicious trick (scareware). Be very cautious of alerts that push you to take immediate action via unknown apps or links.

 - Check for fake alerts/scareware and avoid clicking on them

4. Keep your operating system & apps up-to-date:

Updates often patch security vulnerabilities that malware can exploit. Ensuring your phone’s OS and apps are updated reduces risk.

- Keep your operating system & apps up-to-date

5. Back up your data and, if necessary, reset your phone: 

If you can’t seem to remove the malicious behaviour, back up your important files (contacts, photos) then perform a factory reset (erasing all data and starting fresh). Make sure any backup is clean (i.e., before the issues started).

 - Back up your data and, if necessary, reset your phone

 

 - It would be nice to know your opinion about the blog in the comments.

- Vote here the best tip

 

Cyber security problem 1

 - 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…

- Information about the problem

• Five good tips to avoid or solve the problem:

1. Use a Reliable VPN (Virtual Private Network):

- Information about VPN

      

·         A VPN encrypts all your traffic, even on public networks.

·         It makes your online activity invisible to others on the same network.

·         Good VPNs: NordVPN, ExpressVPN, ProtonVPN (free limited version available).

2. Avoid Accesing Sensitive Services:

- Avoid Accessing Sensitive Services

·         Never log in to banking, work dashboards, or confidential platforms on public Wi-Fi unless protected by a VPN.

·         Wait until on a secure network — or use mobile data for safer access if necessary.

3. Use Two-Factor Authentication (2FA) Everywhere:

- Information about 2FA

·         Even if someone gets your login credentials, they can’t access accounts without your second authentication method.

·         Enable 2FA on email, work apps, cloud storage, etc.

4. Turn Off Auto-Connect and File Sharing:

- Information about Turn Off Auto-Connect and File Sharing

·         Disable auto-join for open networks and file/printer sharing in your device settings.

·         On Windows/Mac, set public Wi-Fi networks as “Public” (not “Home” or “Trusted”).

5. Create a Personal Hotspot (When Possible):

- Information Create a Personal Hotspot

·         If he has a phone with mobile data, he can create a secure hotspot and work from that.

·         Far safer than public Wi-Fi, especially if he has unlimited or large data plans.

- It would be nice to know your opinion about the blog in the comments.

 - Vote here the best tip

Final article

And I think that this is the best PC quality-price: 

- Graphics Card (GPU): In 2025, the most recommended graphics cards are the RTX 4070 Ti, RTX 4080 Super, and RX 7900 XTX for 1440p and 4K gaming. But if you're on a budget, the RTX 4060 and RX 7600 offer good performance at 1080p.

- Processor (CPU): The Intel Core i5-13600K or Ryzen 7 7800X3D are powerful and balanced options. If you're looking for the best of the best, the Intel Core i9-14900K or Ryzen 9 7950X3D is a premium choice.

- RAM: 16GB DDR5 is the recommended minimum, but if you need to fully optimize it, go for 32GB DDR5 6000MHz.

SSD Storage: An NVMe SSD of at least 1TB is mandatory in 2025 for fast loading. Models like the Samsung 990 Pro or WD Black SN850X are among the best.

- Power Supply: Don't skimp on the PSU. A 750W or higher PSU with 80 Plus Gold certification will ensure stability and efficiency.

- Cooling: Powerful gaming PCs generate heat, so AIO liquid cooling or high-quality fans are recommended.

- But If you only want to buy it you can buy this:

- Best Cheap Gaming PC (Under €1000)

Output peripherals

 What are the Output peripherals?

Output peripherals are devices that receive data from a computer and present it to the user in a form that is understandable or usable. These devices take the processed information from the computer and convert it into visual, audio, or physical forms that allow users to perceive or utilize the results of computer operations. Examples of output peripherals include monitors, which display images, videos, and text; printers, which produce physical copies of digital documents; speakers, which output sound; and headphones, which provide personal audio output. Output peripherals are essential for communicating the results of computing tasks back to the user and enabling interaction with the computer’s processed data.

- Link for buy a monitor

- Link for buy a printer

- Link for buy a speaker

- Link for buy a headphones

- Link to general information