CHART: Digital Image properties

DIGITAL IMAGE - PROBLEMS ( Theme 1)

PROBLEMS

 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?

DIN A4 size: 210 × 297 mm = 8.27 × 11.69 inches.
At a quality of 200 dpi:

Width = 8.27 × 200 = 1654 pixels
Height = 11.69 × 200 = 2338 pixels

Therefore, the image should have a resolution of 1654 × 2338 pixels (approximately 3.87 MP) to be printed in A4 size at 200 dpi quality.

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

DIN A4 size: 210 × 297 mm = 8.27 × 11.69 inches.
At a quality of 300 dpi:

Width = 8.27 × 300 = 2481 pixels
Height = 11.69 × 300 = 3507 pixels

Therefore, the image should have a resolution of 2481 × 3507 pixels (approximately 8.7 MP) to be printed in A4 size at 300 dpi quality.

ARTICLE 2: The Problem of Using the Same Password for All Accounts

Why Using the Same Password Everywhere Is a Big Security Risk?

Problem Description

Many people often use the same password for all their accounts and applications. They avoid creating complicated passwords because they are hard to remember and too long. While this might seem convenient, it significantly increases the risk of cyberattacks. If one of your accounts is compromised, hackers can use the stolen password to access all your other accounts, leading to identity theft, financial loss, and personal data breaches.

What is Password Reuse?

Password reuse is the practice of using the same password across multiple online services or accounts. This behavior is a major security risk because it makes it easier for attackers to gain unauthorized access to many of your accounts if one password is exposed.

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Useful Links to Learn More About Password Reuse and How to Solve It

• “Reusing Passwords: Why It’s Not Worth It” – Cybernews

• “Password Management Best Practices 2025” – Security Boulevard

• “Basic Security Practices Regarding Passwords and Online Identities” – ENISA

• “Password Reuse” – 1Kosmos Security Glossary

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5 Tips to Avoid the Password Reuse Problem

1. Use a Password Manager: A password manager securely stores unique passwords for every account, so you don’t have to remember them all.

2. Enable Two-Factor Authentication (2FA): Even if a password is compromised, 2FA adds a second verification step to protect your account.

3. Create Memorable Passphrases: Instead of complicated passwords, use longer but easy-to-remember phrases (e.g., "CoffeeSunshine2025!").

4. Change Passwords Regularly: Update important passwords periodically to minimize the damage if they are stolen.

5. Avoid Using Personal Info: Don’t use birthdays, names, or common words in your passwords—they are easy to guess.

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Which Tip Do You Find Most Useful to Improve Your Password Security?

• Leave a comment with your opinion and click here to vote in the questioner.

Voting Results (Pie Chart)

This chart shows the percentage of users who voted for each tip.

ARTICLE 1: Phishing Attacks

How to Spot and Stop Email & Message Scams ?

Problem: Emails and Messages That Steal Your Credentials

Recently, I’ve been receiving emails and instant messages that appear legitimate at first glance. These messages often contain URLs that lead to fake websites, asking me to input personal information like my email, password, or even credit card details. Once entered, this data is sent to hackers, allowing them to access personal accounts, commit fraud, or even steal identities.

 What is Phishing?

Phishing is a type of cyberattack where attackers impersonate trusted entities (like banks, companies, or services) to trick users into revealing sensitive information such as usernames, passwords, and credit card numbers. These attacks are most commonly carried out via email, SMS, or messaging apps.

 →Learn More:

• Google Safety Center: Scams & Fraud (incluye phishing)
• FTC: Evita estafas de phishing
• NIST Glossary: Definición de phishing

 5 Tips to Protect Yourself from Phishing

1. Check the sender’s email address carefully – Look for misspellings or unusual domains.
2. Don’t click on suspicious links – Hover over the link first to preview the actual URL.
3. Enable Two-Factor Authentication (2FA) – Adds an extra layer of security to your logins.
4. Update your browser and antivirus – Security software helps detect malicious attempts.
5. Report phishing attempts – Use your email provider’s “report phishing” button or alert your IT team.

 What do you think about the tips? 

• Leave a comment with your opinion and click here to vote in the questioner.

 Voting Results (Pie Chart)

This chart shows the percentage of users who voted for each tip.

 

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Stay alert. Phishing is dangerous because it looks so real. When in doubt, don’t click!

4º Article - AUDIO

 

MY BLOG IS READY!

 Requirements I have completed on my blog:

• I have published my blog and made sure it works correctly.

• I have already sent the blog link to the teacher.

• I chose a template that fits my style and the topic of my blog.

 👈MY BLOG  👈THE TEMPLATE
                                                                       

• I went into the settings and changed the language to English.

• I have published several articles on my blog.

 

 

• I included labels (tags) in my posts to keep them organized.

• I added a custom favicon and a nice header with a photo.

 

• I created a post that includes photos and links.

PC TOTAL PRICES

How to Build Your Own PC: Complete Guide with Prices and Reasons for Each Component

Building your own PC is a rewarding experience that allows you to customize the machine to your exact needs. In this guide, I'll explain each essential component, why I chose it, and provide prices with links where you can buy them. Let's get started!