When you capture a photograph with your digital camera, the camera will not only store the current date and time into the image file but even the camera settings.

Exif Metadata in Photographs

The information that is recorded by the camera into the photograph may include details about the camera model itself, the lens that was used, shutter speed, aperture, focal length and so on. Some modern digital cameras and camera phones are GPS enabled and they can therefore save even the location co-ordinates (latitude and longitude) with the photographs.
All this “metadata” is embedded into photographs using the standard Exif format that can easily be read by most image editing programs as well as online photo sharing websites like Flickr and Picasa Web Albums.

1. How to View Exif Data of Images

If you are impressed by a photograph and would like to know more about the camera make and the lens settings that were used when capturing that picture, here’s what you can do do.
Go to Jeffrey’s Exif Viewer and upload the photograph (or if you found the picture on the web, simply copy-paste the image URL). The tool will create a nice summary of all the meta data stored in that photograph along with the location information (see example).
Alternatively, you may use Google’s Picasa, Windows Live Photo Gallery, or any other photo viewer programs to display Exif data from photographs on your desktop.

2. How to Edit Exif Data in Photographs

Why would anyone want to modify the Exif data of photographs? Well, there can be several genuine reasons.
For instance, the internal date of your camera was incorrect and therefore all the pictures were captured with a wrong timestamp. Or you want to add your name to the photograph’s metadata so that people immediately know who the owner is. WIth an Exif editor, you can also geo-tag your photographs manually even if your camera doesn’t have GPS.
You may be a bit surprised but Windows Explorer is actually a wonderful Exif editor. Just right click any image file, choose Properties and click the Details tab. You can now edit a wide range of metadata associated with that image from the camera model to the shooting date to copyright information and more.
Windows Explorer won’t let you edit GPS related information of photographs but Google’s Picasa software is a good choice for doing that.
Finally, if you want to change the Exif data in tons of photographs, you can edit them all in one go using a dedicated Exif editors like Geosetter or Microsoft Pro Photo.  Geosetter can pull Exif tags from one photograph and apply them to all your other photos while Pro Photo is more suited for geo-tagging pictures.
Similar stuff can also be done with the help of command like utilities like jHead and ExifTool – these are very powerful tools but implementation is obviously a bit geeky.

3. How to Remove Metadata from Photographs

Sometimes the Exif data of your photographs may reveal more than what you would expect. It may therefore sometimes sense to strip your images of all the meta information before uploading them to the web.
To remove all the metadata from a photograph, just right-click the files inside Windows Explorer and choose Properties. Now click the Details tab and select the option that says “Remove Properties and Personal Information.”
Choose “Remove the follow properties from this file” followed by “Select All” and click OK. All the private metadata tags are now erased from the photograph. Simple!

When you need to send an important file to a contact, you can either send it as an email attachment or, if the file size is too big for an email message, you can upload it to any of the file hosting services and share the download link with your contact over email.
IM software like Skype, Google Talk and Yahoo Messenger also let you to easily transfer files from one computer to another without imposing any restrictions on file size or the file type. This is generally quicker than sending files over email but the only downside is that both parties should be running the IM client in order or send or receive files.
There’s another interesting option that offers IM like flexibility and yet you can use it in the browser itself without requiring any software – it’s called iSendr.
It works something like this. You (the sender) initiate a file transfer session at your end and iSendr will provide you with a private link that you can pass on to your friend over a phone call or a text message. When your friend opens that link in her browser, the file transfer will start immediately.
What’s unique here is that the file is getting copied from your computer to her machine directly so some people may find with this approach more secure as their files aren’t not getting uploaded to any third-party server.
Also, there are no file size restrictions and as soon as the file gets downloaded to your friend’s computer, the sharing session will end automatically.

A Superb Trick To Hide Text In Notepad

Here is a small trick to hide text inside your windows default text editor i.e Notepad using command prompt, but this trick works only on NTFS file system.


Steps to hide text in a Notepad

1. Open your command prompt Start-->Run and Type cmd

2. Move to folder where you want to save your file.
 
3. Type the below code in your command prompt


notepad filename.txt:hidden

4. Write some data and save(Ctrl+S) the file.

5. Browse to the file location and Open filename.txt you cannot see any data in the file.

6. To retrieve the hidden data open command prompt and type the same command.

notepad filename.txt:hidden