Register ICMag Forum Menu Features Search Today's Posts Mark Forums Read
You are viewing our:
in:
Forums > Talk About It! > Security & Legal Issues > metadata 101: read me before uploading photos

Thread Title Search
Post Reply
metadata 101: read me before uploading photos Thread Tools Search this Thread
Old 04-20-2012, 02:04 PM #1
avant gardener
Banned

Join Date: Jun 2011
Location: punk rock gypsy.
Posts: 784
avant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of light
metadata 101: read me before uploading photos

there are some things you should be aware of about digital photographs.

JPEGs and other image files contain metadata called EXIF. that is, hidden information attached to the picture you see. this can include anything from the date and time the photo was taken to the color balance of the image to whether or not a flash was used. most of this stuff is pretty innocuous, but there are a couple pieces of metadata that you definitely don't want floating around on the nets. most obvious is the geotag which gives the coordinates where the picture was taken, accurate to a couple dozen feet. more subtle is the serial number of your device. this can link photos to a cell phone account which makes it easy to identify the photographer.

If you entered personal info into your camera, like your name, that too will be automatically transmitted in the EXIF data when a photo gets uploaded.

the good news is that it's really easy to protect your sensitive information. for new images, this is as simple as disabling the location feature on your phone or GPS enabled camera. better yet, tell the camera not to record any EXIF data, or don't post anything from a GPS enabled device.

for older images (and to be perfectly thorough with new ones), you'll need an application to view and edit your EXIF file, which is where most of your metadata lives. there are plenty of freeware options:

Mac OsX:if you already happen to be using aperture, you can just go to the metadata menu and open the GPS pane. otherwise, there's an app called smallimage that works really well. find it here: https://smallimage.en.softonic.com/mac

Linux:
you're going to need to know your way around a command line to do this one as there's no GUI that i know about. but then again, if you're already running redhat and you still need me to tell you this, i don't know even know what to say.
exiftool is the standard:
https://www.sno.phy.queensu.ca/~phil/exiftool/

jhead is popular too:
https://www.sentex.net/~mwandel/jhead/usage.html

Windows 7:
i haven't used a microsoft operating system since '98, but some friends suggested this program: https://www.photome.de/
Another free graphics program with lots of great features is Photoscape. It will allow you to resize/edit batches of photos at once, saving tons of time.

Whatever your platform, if you've got photoshop, clicking "save for web" will remove your location from an image.

It's just good security culture to police your own information. While ICM does strip information from posted photos, it does so ONLY if they get resized by the server. That's why it's up to you to ensure your images are clear of sensitive data before you upload them anywhere. Many other sites will post your photos exactly as you upload them, with EXIF info intact.

Last edited by Skip; 04-20-2012 at 05:01 PM..
avant gardener is offline Quote


8 members found this post helpful.
Old 04-20-2012, 03:39 PM #2
Leroy Brown
Member

Join Date: Dec 2010
Posts: 526
Leroy Brown is a jewel in the roughLeroy Brown is a jewel in the roughLeroy Brown is a jewel in the roughLeroy Brown is a jewel in the roughLeroy Brown is a jewel in the roughLeroy Brown is a jewel in the rough
Great thread!

https://regex.info/exif.cgi

^^ This should be here, allows you to view exif data quickly via cut & paste web link OR upload file
Leroy Brown is offline Quote


Old 04-20-2012, 05:05 PM #3
Skip
Let's Get Small!

Skip's Avatar

Join Date: Jan 2004
Posts: 5,484
Skip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond repute
The real problem comes with the convenience of cellphone cameras, able to take a pic and upload with just a few clicks. This is where ppl can have problems with EXIF data. So just tell your camera NOT TO RECORD EXIF and Geolocation DATA, and you'll have no problems.
__________________
"America's freedom lies in cannabis." - feltonmuggs

"Prohibition is the gateway to fascism." - Treewizard
Skip is offline Quote


Old 04-20-2012, 05:38 PM #4
BadRabbit
Member

Join Date: May 2008
Posts: 742
BadRabbit is a jewel in the roughBadRabbit is a jewel in the roughBadRabbit is a jewel in the roughBadRabbit is a jewel in the roughBadRabbit is a jewel in the roughBadRabbit is a jewel in the rough
In Windows 7, If you select a photo using your 'explorer' window, right click on a photo and select "properties" from the drop menu, then on the properties dialogue box, select the "details" tab. On that page, a selection is provided for "remove properties and personal information". The brings up the "remove properties" dialogue box, on which you can select "create a copy with all possible properties removed" (and the advisory that "some of these properties might contain personal information").

Select "OK" and the system makes a copy of the file (adds the word "copy" to the file name and saves as a new file.) with all properties removed.

I'm assuming that's a clean version that can be safely posted ..... if anyone can assert differently, please do so.

rabbit
BadRabbit is offline Quote


1 members found this post helpful.
Old 04-20-2012, 05:52 PM #5
Skip
Let's Get Small!

Skip's Avatar

Join Date: Jan 2004
Posts: 5,484
Skip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond reputeSkip has a reputation beyond repute
Quote:
Originally Posted by BadRabbit View Post
In Windows 7, If you select a photo using your 'explorer' window, right click on a photo and select "properties" from the drop menu, then on the properties dialogue box, select the "details" tab. On that page, a selection is provided for "remove properties and personal information". The brings up the "remove properties" dialogue box, on which you can select "create a copy with all possible properties removed" (and the advisory that "some of these properties might contain personal information").

Select "OK" and the system makes a copy of the file (adds the word "copy" to the file name and saves as a new file.) with all properties removed.

I'm assuming that's a clean version that can be safely posted ..... if anyone can assert differently, please do so.
Yes, that's correct. However you're assuming ppl have actually uploaded their images to their computer first... Many don't anymore. It's so easy to post an image from a cellphone. However, once it's on the computer you can do a lot of things including editing, cropping, color correction, adding a copyright notice, etc.

You can even batch process all the photos you want to upload at once so they all are at the right size, with EXIF info removed... Then uploads go very fast on icmag. Try uploading large unedited images and you will wait and wait... It's your choice and those large image uploads slow down the server for everyone. So if you're doing it, I'll direct all complaints about icmag being slow to you...

Once upon a time when cameras only took 1 or 2 megapixel images, this wasn't an issue. Now most cameras can do 8-16 megapixels, so those images are HUGE, and uploading them requires a lot of bandwidth, then resizing them requires a lot of server processing time. So don't just think about yourself and how convenient it is, think about how you affect others by being an inconsiderate bandwidth hog.

When icmag started, Gypsy clearly intended to make it easy for everyone to upload their images here. However that was eight years ago and in that time things have changed. Camera technology has progressed with higher resolutions and bigger files. Yet here we are, on the same server we had back then (we did add a database server, but that doesn't resize images). We are due for a server upgrade in a few months, and perhaps then we can loosen some of the restrictions I've had to put in place. If everyone edited their images to <150k before uploading we could easily go back to 10 images per upload, but that is not the case for now...

Some simple math...
Upload 10 images @ 4MB each = 40MB upload
Upload 10 images @ 150K each = 1.5MB upload

Can you see the difference in how long it would take to upload? 30 times longer for the big images.

Then add the time for the server to resize 10 4MB images (time varies).
Say it takes 5 seconds per image, that would be 50 seconds of server time just for your images, slowing down the ICMag experience for everyone.

And there could be others uploading at the same time, taxing the server even more, taking more even more time.

Then realize that with 10 150K images, no resizing is necessary at all... Fast upload (probably a few seconds) and no slowdown of server to resize your images.

What I could do is raise the upload limit for those who promise to edit down their images below 150K before uploading... But there is no way to check for compliance.
__________________
"America's freedom lies in cannabis." - feltonmuggs

"Prohibition is the gateway to fascism." - Treewizard

Last edited by Skip; 04-20-2012 at 06:20 PM..
Skip is offline Quote


Old 04-20-2012, 09:18 PM #6
avant gardener
Banned

Join Date: Jun 2011
Location: punk rock gypsy.
Posts: 784
avant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of light
here's a tool i forgot to add:
https://pixelgarde.com/
pixelgarde is a fully functional metadata editor app for iOS and android.
you can delete (or spoof) your exif right from your phone.

free version tags your photos with a big colored "X."
paid version is $2 and doesn't brand your images.
avant gardener is offline Quote


1 members found this post helpful.
Old 04-21-2012, 12:33 AM #7
smokefrogg
Senior Member

Join Date: Jan 2010
Location: a lilypad in southern california
Posts: 1,356
smokefrogg is just really nicesmokefrogg is just really nicesmokefrogg is just really nicesmokefrogg is just really nicesmokefrogg is just really nicesmokefrogg is just really nicesmokefrogg is just really nicesmokefrogg is just really nicesmokefrogg is just really nice
exiftool is around for mac osx also, it is a commandline tool so you will need to be familiar with that, i find it is quick and handy for batch processing a folder full of images
__________________
what's growing in the frogg's pond:
https://www.icmag.com/modules/Journa...luserid=134668
smokefrogg is offline Quote


Old 04-21-2012, 03:25 AM #8
avant gardener
Banned

Join Date: Jun 2011
Location: punk rock gypsy.
Posts: 784
avant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of lightavant gardener is a glorious beacon of light
here's stories about 2 guys who DEFINITELY should have known better but still compromised themselves by leaving their geotags hanging out.

adam savage, the mythbusters guy:
https://www.nytimes.com/2010/08/12/t...950FJLQhvK/84w
which is pretty bad, but this next one takes the cake.


and (ohhhh say it ain't so) some alleged world class hacker type:
https://www.dailymail.co.uk/news/arti...ts-online.html

this guy was good enough to break into law enforcement computers to dox undercover pigs, but he couldn't remember not to post his damn address for the whole world to see. go figure.



avant gardener is offline Quote


1 members found this post helpful.
Old 04-25-2012, 08:59 PM #9
detoneSmoker
Guest

Posts: n/a
Quote:
Originally Posted by avant gardener;5073528

and (ohhhh say it ain't so) some alleged world class hacker type:
[URL
https://www.dailymail.co.uk/news/article-2129257/Higinio-O-Ochoa-III-FBI-led-Anonymous-hacker-girlfriend-posts-picture-breasts-online.html[/url]

this guy was good enough to break into law enforcement computers to dox undercover pigs, but he couldn't remember not to post his damn address for the whole world to see. go figure.
Love how he was trying to be cool and saying pwned by...I hate faggots like this jerk off. I hope he gets but fucked so hard hell never again try being alittle bitch and hacking ppl.

So if i take a pic on my phone but upload it direct connect, does it still run the same gps location risks? I immediately erase my pics after upload.
Quote


Old 04-25-2012, 10:41 PM #10
Anti
Sorcerer's Apprentice

Anti's Avatar

Join Date: Feb 2009
Location: Here
Posts: 3,974
Anti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud ofAnti has much to be proud of
Quote:
Originally Posted by detoneSmoker View Post
Love how he was trying to be cool and saying pwned by...I hate faggots like this jerk off. I hope he gets but fucked so hard hell never again try being alittle bitch and hacking ppl.

So if i take a pic on my phone but upload it direct connect, does it still run the same gps location risks? I immediately erase my pics after upload.
The geotag is a part of the EXIF data.

So if your phone geotags the image (or stores anything else in exif data, like if you put your name/location into your phone) then it will still be on the image even once you transfer it to your computer.
__________________
mega and anti's excellent adventure
anti's 800w mini colosseum
anti's microstealth 3000
micro group

DISCLAIMER: I am not an expert. I am not a guru. I am just some guy who is here to learn - just like you. Take what you like and leave the rest.

Anti is offline Quote


Post Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT +2. The time now is 03:30 PM.




This site is for educational and entertainment purposes only.
You must be of legal age to view ICmag and participate here.
All postings are the responsibility of their authors.
Powered by: vBulletin Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.