This lets you debug problems that you may come across later, especially as improvements are made to image processing in the Core ImageMagick Library. Downloading Input Images and Results As much as possible, I try to use images built-into IM such as " logo: " or " rose: " as input images for IM example commands, or to generate input images using IM commands. I also often re-use the output of previous commands in later examples. Because of this, you usually don't need to download any 'test' images in order to try out the examples yourself.
However, such generated or built-in images are not always convenient. So, when I do use an external image, I tend to re-use that input image, or the results of previous examples, for later examples in that section. Sometimes the original source image will be displayed or for larger images a link to the source image is provided. More commonly only the final resulting image will be shown, as the input is well known or obvious.
Almost all the IM example commands shown are executed in the same web directory in which they appear. That is, the command you see is the command that was actually used to generate the image.
Because of this you can modify the page's URL to download or view the input image s used by an example. See also the example of a Fancy Photo Index of those images. If text output or image information is produced by an example, it is saved to a text file, and an image of it is generated for display on the Web page.
Selecting the text output image will link you to a copy of the actual text output by the command. In all these examples, selecting the output image should let you download the image which was actually created by the example command.
But be warned, not all browsers understand all image formats used. External Image Sources By the way, most of the source images used in these examples come from Anthony's Icon Library , particularly the background tiles , large clip-art , and dragons sections of the library. I like dragons! ASIDE: these pages may be offline as the web site slowly moves to a new server. This library actually predates the WWW. I created it in , due to the lack of good, clean iconic images for use on the X Window System.
The advent of the WWW has of course changed this, but my original library still exists and remains available as a source of images, even though it is not actively growing. Some specific images, and larger images, are contributed by the authors of specific examples.
The authors of such examples are listed in the contributed section, or at the bottom of the page. If you are looking for a specific image, I recommend using Google Image Search or similar to find something appropriate. You can, of course, convert or resize such images using IM for your own purposes. However, you should be careful about copyright if you plan to use such images commercially. The PNG image format supports images with semi-transparent pixels, a feature few other image formats provide.
It is also a very well-understood image format and, as such, is usable by most of today's image programs and Web browsers. Technically, this is only problem with IE, not ImageMagick. Displaying Images on Your Screen Display problems can also occur when displaying images on-screen. Because of this, I recommend using a command like the following to tile a ' checkerboard ' pattern underneath the image, to highlight any transparent or semi-transparent pixels in it.
Convex hull smallest area convex polygon containing the image foreground objects. In addition, the minimum bounding box and unrotate angle are also generated. Decorate add a border or frame to an image. Delineate image features Canny edge detection , Hough lines.
Discrete Fourier transform implements the forward and inverse DFT. Distributed pixel cache offload intermediate pixel storage to one or more remote servers. Draw add shapes or text to an image. Encipher or decipher an image convert ordinary images into unintelligible gibberish and back again.
Format conversion convert an image from one format to another e. Generalized pixel distortion correct for, or induce image distortions including perspective. Heterogeneous distributed processing certain algorithms are OpenCL -enabled to take advantage of speed-ups offered by executing in concert across heterogeneous platforms consisting of CPUs, GPUs, and other processors. High dynamic-range images accurately represent the wide range of intensity levels found in real scenes ranging from the brightest direct sunlight to the deepest darkest shadows.
Command-line Tools ImageMagick includes a number of command-line utilities for manipulating images. We also support sub-commands for compatibility with ImageMagick version 6 : magick animate animate an image sequence on any X server.
You can capture a single window, the entire screen, or any rectangular portion of the screen. Mogrify overwrites the original image file, whereas, magick writes to a different image file. The images are tiled on the composite image optionally adorned with a border, frame, image name, and more. Special effects: blur, sharpen, threshold, or tint an image. Animation: create a GIF animation sequence from a group of images.
Image identification : describe the format and attributes of an image. Composite : overlap one image over another. Montage : juxtapose image thumbnails on an image canvas. Generalized pixel distortion : correct for, or induce image distortions including perspective. Morphology of shapes : extract features, describe shapes and recognize patterns in images.
Motion picture support : read and write the common image formats used in digital film work. Image calculator : apply a mathematical expression to an image or image channels. Discrete Fourier transform : implements the forward and inverse DFT. High dynamic-range images : accurately represent the wide range of intensity levels found in real scenes ranging from the brightest direct sunlight to the deepest darkest shadows. Encipher or decipher an image : convert ordinary images into unintelligible gibberish and back again.
Virtual pixel support : convenient access to pixels outside the image region.
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