It was a forward email that caught my attention… probably you also might have received it and wondered how on earth this is done…! And you might have thought it would have been better if you also could do it.
What was so interesting about that mail then..? Well it had a JPEG image as attachment whose thumbnail and the actual image were different… strange heh…! And the mail says it is mystery…. break it if you can etc etc….
Sounds interesting…..? Well I will share the secret of that image with you and how to do one for yourself.
A JPEG image stores a lot of details about the image as image header. The header uses a format called EXIF to store the details. Thumbnail of the image is also a part of the EXIF. So if we can manually write this Exif information then we can play with the image as we want… pretty simple rite…!
Download Exifer a small utility and install it and just follow the following steps.
1) Navigare to the folder in which you have the Jpeg image. Select the image you want to modify. If the image has thumbnail data stored then, it will be displayed in the lower rigth panel.
2) Right click on the thumbnail image in the Exif Thumbnail panel and click on “Insert thumbnail”. Select the image you want the thumbnail to be. You are done.
Now fire it across and create your own mysteries….!
Download this sample Image and observe the thumbnail and original image.
