Scanning – What can lead to vertical lines on scanned photos?

I also suspect that there is something Scans interfere with your scanner.

Since the error follows the scan direction, the problem is probably the scan unit (not the glass).

Scanners using CIS (Contact Image Sensor) can be located on the "light guide" that is in close contact with the scan surface. For scanners with CCDs, the problem may be with a number of mirrors or the lens in front of the sensor.

If you ever loosened the glass from the scanner body, you may have reset it to the sensor with the wrong side. The glass could have coatings on one side which are required to prevent reflections from interfering with the scan. The same applies to all other components between sensor and target.

iphone – Set the default paper size for scanning with the pass-through camera

How can I set the default paper size when scanning with a through-camera with my iPhone?

I use the fantastic new Mojave feature to scan documents directly into the preview with my iPhone. My paper is a white A4 sheet. The iPhone automatically detects the edges against a darker background and I take a snapshot. However, when previewed, the image is slightly stretched and the dimensions (cmd + I) show that it has a letter size of 8.5 x 11.

How can I make sure that it is A4?

35mm – Film Negative Scanning – Resolution, DPI and File Size

dpi is about the inch … pixels per inch.

4500 x 3000 pixels at 3200 dpi are 1.4 x 0.94 inches on the film.

4500 x 3000 pixels at 360 dpi correspond to 12.5 x 8.33 inches on the printing paper. The distance and the size of the printed pixels. It should have also indicated the inch dimensions.

This is a simple split …. 4500 pixels / 360 dpi = 12.5 inches.

Exactly the same pixels, but on film or paper media simply scaled to different inch sizes. This is an extremely important basic principle of printing. Dpi is just a number that exists only when the inches are specified.

At 4500 x 3000 pixels, the print size depends on the …
For example, if dramatically at 100 dpi, it would be 45×30 inches.
If printed at 300 dpi, then 15 x 10 inches.
If the printout is even scaled to 12 x 8 inches, 375 dpi will be output.

nmap – Tools for scanning TCP / UDP ports under IPv6

Does Unicornscan, Masscan, and Netcat support IPv6 addresses for their port scanning, service detection, and OS detection capabilities?
I know that NMAP offers this, but I'm looking for alternatives to NMAP because my device does not have the resources to do it.

I came across an open request for IPv6 support in the 7th issue of masscan, but what about the others? Has anyone taken over the maintenance of Unicornscan?

Scanning – How to Paste Thin Borders in Emulsion Style When Scanning Movie Negatives?

I leave the scanner (or its SW: I use Vuescan) to find the frame in the neg and then only slightly increase the frame size including part of the discount (the unexposed edge of the negative). That's not hard to do.

(When printing negatives I did without the filled negative case and now use glass that is painful to position the film, but otherwise much better.)

Thunderbird 52.1 -> Disable all junk-related // scanning features

This concerns Thunderbird 52.1.1. I have currently disabled or disabled all junk mail-related settings on the Security tab. Even so, I occasionally get the message that "Thunderbird thinks this is junk mail" and I have to say that this is not the case. Where is there a setting that I can disable once and for all?

nmap – difference between scanning in footprint and scanning

Good night to everybody.

I am trying to acquire a CEH certificate. I have a question about a simple quiz and a book I'm reading.
The book says that we can use networking tools (such as tarcert, nslookup, etc.) to search for a destination.
The CEH book therefore states that scanning occurs during the footprinting process. But I've run a test in gocertify that says scanning is a pre-attack case and not a matter of recognition. The question is which is correct?

I tried to look, but still confused. Thank you all, even if you do not know this answer.

SEO – We block bots, crawlers, spiders and scanning tools on our servers. Can this affect the DA (Domain Authority)?

I knew the concept of domain / page authority in SEO only an hour ago. We've blocked bots, crawlers, spiders, and scanners in general via ModSecurity rules (custom rules) directly from Apache.

We only allow bots from Google, Bing, Yahoo, and other third-party tools, but we block automated tools, risky countries (like Russia, China, Ukraine, etc.), risky IPs, and others because of negative traffic experiences and attacks in the past , Everything works fine now, but I'm afraid this may affect how some tools measure the data of all the domains we host.

Blocking bots affects DA results, like the one on this page?

Many Thanks.

Scanning – How to scan dust from images in Linux?

I have a large number of scans made with the same scanner. After finding that the images had a few consistent dust specifications, I scanned the dust in the hope of somehow removing the dust from the images but could not figure it out. Is there a way to use the dust scan with ImageMagick (or a similar scriptable utility that works on Linux) to remove the dust (script magic) from the rest of the images?