Filed under: Chromium, FOSS, General, HowTo, image editing, linux, windows
I receive a lot of emails with photos attached that have been taken in a portrait orientation. Most modern digital cameras and smart phones have orientation sensors that tell the camera if it's been turned on end. When this happens, rather than actually rotate the picture, the camera sets a flag in the image's EXIF data to communicate which way is up in the photo. Read more
Filed under: command line, HowTo, image editing, linux, Ubuntu, windows
I've recently been looking for a way to organize my digital photos by the date and time they were taken. Since I have more than one camera, it's not as simple as just sorting through file names since the cameras name the files differently. I was going to write a script using Image Magick to read the EXIF data and then the script would rename and organize the photo into a folder based on the date the photo was taken. Well, it turns out that someone has already written a handy program to take care of most of this task. The program is called jhead. Read more
I've got a huge number of digital photos on my computer that need to be organized. What I would like to do is sort the pictures by the date they were taken. The first step to sorting the pictures is to know the date they were taken. As long as the clock is properly set on your camera, your pictures should have the correct date and time of the photo stored in the image's EXIF data. You can view an image's EXIF data using the identify command. Read more
In today's post I'm going to show how to embed a text message into an image file. This type of messaging is known as steganography. Steganography is the practice of hiding secrets in such a way that only the intended message recipient would know to look for your hidden message.
In this basic form of secret messaging we'll be adding text onto the end of a file. I'm going to use the following image of Tux for my example. Read more
Filed under: command line, HowTo, image editing, linux, Ubuntu
As smart phones are becoming more pervasive, 2D bar codes are starting to appear all over the place. The QR Code format is one of the most commonly used styles of these matrix bar codes. These QR Codes often contain a URL to send a smart phone user to a particular web site, but all kinds of textual information can be embedded in these codes.