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?

To calculate the resolution of the image needed for printing at 200 dpi (dots per inch) on a DIN A4 paper (210 × 297 mm), you can follow these steps:

Step 1: Convert the paper size from millimeters to inches.

Since there are 25.4 millimeters in an inch, you convert the dimensions as follows:

• Width: $210 \, \text{mm} \div 25.4 \, \text{mm/inch} \approx 8.27 \, \text{inches}$
• Height: $297 \, \text{mm} \div 25.4 \, \text{mm/inch} \approx 11.69 \, \text{inches}$

So, the dimensions of the DIN A4 paper in inches are approximately 8.27 × 11.69 inches.

Step 2: Calculate the image resolution.

The resolution required for printing is the product of the paper dimensions in inches and the desired printing quality in dpi.

• Width resolution: $8.27 \, \text{inches} \times 200 \, \text{dpi} = 1654 \, \text{pixels}$
• Height resolution: $11.69 \, \text{inches} \times 200 \, \text{dpi} = 2338 \, \text{pixels}$

Final Answer:

The resolution of the image needed to print a DIN A4 photograph at 200 dpi would be 1654 × 2338 pixels.

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

To convert a picture to have a resolution of 300 DPI (dots per inch), we need to adjust the number of pixels in the image based on its physical dimensions (in inches).

1. Convert paper size to inches:

Width: 210 mm÷25.4=8.27 inches

Height: 297 mm÷25.4=11.69 inches

2. Calculate the required resolution at 300 DPI:

Width resolution: 8.27 inches×300 DPI=2481 pixels

Height resolution: 11.69 inches×300 DPI=3507 pixels

To print the same image at 300 dpi on DIN A4 paper, the required resolution would be 2481 x 3507 pixels.

Concept map

 

case 1

 PROBLEM :

I have opened an email sent by a friend and clicked on a link that looked legitimate and harmless. Once i opened the attachment, it automatically downloads software to my computer. I do not know what has happened and how to fix it

Did You Open a Spam Email? 

Business email compromise (BEC) or ​​Email Account Compromise (EAC) via phishing attacks account for the largest losses within cybercrime. In 2020 alone, $1.8 billion was lost from BEC/EAC according to the FBI. 

A phishing email may look like it was sent from a legitimate source — like a colleague, or a company that you do business with — but is actually sent by cybercriminals.

These scam emails trick recipients into taking actions like forwarding the email message to other people, clicking on a link, or downloading malicious attachments.

I FOUND YHIS INFORMATION IN THIS PAGE:

https://www.identityguard.com/news/what-happens-if-you-open-a-phishing-email

If it happens to you , i going to give you some tips

TIPS :

1 .Scan for malware

2. Change your passwords

3. Report the phishing attempt

4. Disconnect your device

5. Backup files

Recommendations to avoid being a victim of phishing 

1- If you recived an email asking for personal or financial things, do not respond.

2.- Do not spend personal information ussing email mensages

3.- Do not access from public places. 

4.- Check the security indicators of the website in which you will enter personal information.

5 -Do not download or open files from untrustworthy sources.

6-Remember: Do not answer any message that seems suspicious

.https://forms.gle/qxmTbavndxUM9tY47

case 2

 problem:

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?.... 

Did you use the same password?

Using the same password for multiple accounts increases the risk of a data breach. If one account is hacked, all others with the same password become vulnerable. Having unique passwords for each account limits the damage if one gets compromised.

Reusing the same password for multiple accounts makes you vulnerable to cyber attacks such as credential stuffing.

Passwords are often your first line of defense when it comes to protecting your information from online threats, which is why you want to create one that is not only strong but unique. Using the same password across multiple accounts can lead to credential stuffing . Credential stuffing is when hackers use previously stolen login credentials  from one website and then “stuff” these credentials into other websites until they find matches. For example, imagine you used the same password for an online shopping account and your online bank account. If a cyber criminal got access to your shopping account where your payment information was saved, they’d be able to figure out which bank you use and have the login credentials they’d need to access it.

Using the same password leaves you and your information vulnerable to financial and identity theft , so it’s important to use a unique one for each of your accounts.

https://www.getcybersafe.gc.ca/en/blogs/why-you-should-never-use-same-password-more-one-account

tips to create a strong password

1-Never use personal information

2-Use a longer password, at least six characters long,

3-Random passwords are the strongest

4-Try to include numbers, symbols, and both uppercase and lowercase letters.

5-Avoid using words that can be found in the dictionary.

https://edu.gcfglobal.org/en/techsavvy/password-tips/1/