The Convert - Linux man page says the command can 'convert between image formats as well as resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more' - and that's no exaggeration. The original and flipped images are appended - one on top of the other. $ convert Sandra_Simpson.png Sandra_flipped.png -append appended.png In this command, we're appending two images together to form a single image. $ convert Sandra_Simpson.jpg -font courier -fill black -pointsize 50 -annotate +50+50 'My Simpsons Look' Sandra_annotated.jpg Experiment with the settings, and you're sure to find some that work well for you. The coordinates are relative to the upper left corner of the image. The pointsize setting should depend on the size of your image file. Note that you should select a text color that will show up on your image and that the size and position of the text must be specified. To add annotation to an image, use a command like this one, but make sure the font size works for your image. The flip will create mirror image of the original image. The rotate command will create an image that looks like you've spun the original image around halfway. Keep in mind that a 180-degree rotate and a flip are not the same thing. Notice that in the first command we're doing the rotation and the conversion to a. $ convert Sandra_Simpson.png -flip Sandra_flipped.png $ convert arrow.jpg -rotate 45 arrow45.png The second uses the -flip option to turn it upside down. The first of the two commands below will rotate an image 45 degrees in a clockward direction. To rotate a file, you need to tell convert how many degrees to rotate it. jpg files in these examples, convert will work with other image types as well (e.g. Note: Use sed 's/jpg/png/' if you want to convert jpg files to. Depending on the number of files to be converted, it still will likely take only take a matter of seconds or possibly minutes to complete the task. png files (or vice versa), you can use a script like this. If you want to use the convert command to generate hundreds of.

These are the internal codes used to identify these two file formats. The 'JFIF' string displayed in the first file and 'PNG' displayed in the other verify that the operation performed as instructed. Yes, convert did all that in a few seconds. If you doubt that the proper conversion could possibly happen as quickly and easily as it does, you can always use the od command to examine the beginning of each of your files. The convert command will use the file name you provide (in this case, arrow.png) to determine what type of file you want to end up with and reformat the image accordingly. The arrow.png image should look the same as the original arrow.jpg file, but the file will have the specified file extension and be different in size. Just use a convert command like the one in this example: $ convert arrow.jpg arrow.png Converting files by image typeĬoverting an image from one format to another is extremely easy with the convert command. Let's look at some simple examples of how you can make it work for you. It easily coverts files from one image format to another and allows you to perform many other image manipulation tasks, as well - and in a lot less time than it would take to make these changes uses desktop tools. Most of us probably know how wonderful a tool Gimp is for editing images, but have you ever thought about manipulating image files on the command line? If not, let me introduce you to the convert command.

Fmpeg convert image format