Index; ImageMagick Examples Preface and Index: Montage, Introduction and . ImageMagick is pretty good at figuring out the right ” -tile ” setting to use for a. Hi, I’m generating the following image using an STL list and the writeImages() method in order to create the animation. Image I am generating. -adjoin, join images into a single multi-image file. -affine matrix, affine transform matrix. -alpha, on, activate, off, deactivate, set, opaque, copy”, transparent.
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Below is list of command-line options recognized by the ImageMagick command-line tools.
If you want a description of a particular option, click on the option name in the navigation bar above and you will go right to it. Imagemagik otherwise noted, each option is recognized by the commands: A Gaussian operator of the given radius and standard deviation sigma is used. If sigma is not given it defaults to 1. See Image Geometry for complete details about the geometry argument.
pdf – Imagemagick -adjoin results in multiple files – Stack Overflow
The -adaptive-resize option defaults to data-dependent triangulation. Use the -filter adjjoin choose a different resampling algorithm. Offsets, if present in the geometry string, ijagemagick ignored, and the -gravity option has no effect. This option is enabled by default. An attempt is made to save all images of an image sequence into the given output file. However, some formats, such as JPEG and PNG, do not support adjoiin than one image per file, and in that case ImageMagick is forced to write each image as a separate file.
As such, if more than one image needs to be written, the filename given is modified by adding a -scene number before the suffix, in order to make distinct names for each image. As an example, the command. In summary, ImageMagick tries to write all images to one file, but will save to multiple files, if any of the following conditions exist Set the drawing transformation matrix for combined rotating and scaling.
This option sets a transformation matrix, for use by subsequent -draw or -transform options. The matrix entries are entered as comma-separated numeric values either in quotes or without spaces. Internally, the transformation matrix has 3×3 elements, but three of them are omitted from the imagemagik because they are constant.
The new transformed coordinates x’y’ of a pixel at position xy in the original image are calculated using the following matrix equation.
The size of the resulting image is that of the smallest rectangle that contains the transformed source image. The parameters t x and t y subsequently shift the image pixels so that those that are moved out of the image area are cut off.
The transformation matrix complies with the left-handed pixel coordinate system: If the translation coefficients t x and t y are omitted they default to 0,0. Therefore, four parameters suffice for rotation and scaling without translation. Scaling by the factors s x and s y in the x and y directions, respectively, is accomplished with the following.
See -transformand the -distort method ‘ Affineprojection for more information. Translation by a displacement t xt y is accomplished like so:. The cumulative effect of a sequence of -affine transformations can be accomplished by instead by a single -affine operation using the matrix equal to the product of the matrices of the individual transformations.
An attempt is made to detect near-singular transformation matrices. If the matrix determinant has a sufficiently small absolute value it is rejected.
Used to set a flag on an image indicating whether or not to use existing alpha channel data, to create an alpha channel, or to perform other operations on the alpha channel. Choose the argument type from the list below. This is a convenience for annotating an image with text.
For more precise control over text annotations, use -draw. The values Xdegrees and Ydegrees control the shears applied to the text, while t x and t y are offsets that give the location of the text relative any -gravity setting and defaults to the upper left corner of the image.
Using -annotate i,agemagick or -annotate degrees x degrees produces an unsheared rotation of the text. The direction of the rotation is positive, which means a clockwise rotation if degrees is positive.
This conforms to the usual mathematical convention once it is realized that the positive y —direction is conventionally considered to be downward for images.
The new transformed coordinates x’y’ of a pixel at position xy zdjoin the image are calculated using the following matrix equation. If t x and t y are omitted, they default to 0. This makes the bottom-left of the text becomes the upper-left corner of the image, which is probably undesirable. Adding a -gravity option in this case leads to nice results. Imagemzgick is any UTF-8 encoded character sequence. If text is of the form ‘ mytext.
Text in a file is taken literally; no embedded formatting characters are recognized. By default, objects e. This will then reduce the number of colors added to an image to just the colors being directly drawn.
That is, no mixed colors are added when drawing such objects. This option creates a single longer image, by joining all the current images in sequence top-to-bottom.
If they are not of the same width, narrower images are padded with the current -background color setting, and their position relative to each other can be controlled by the current -gravity setting. For a different encryption method, see -encipher and -decipher.
This works well for real-life images with little or no extreme dark and light areas, but tend to fail for images with large amounts of bright sky or dark shadows. It also does not work well for diagrams or cartoon like images. It uses the -channel setting, including the ‘ sync ‘ flag for channel synchronizationto determine which color values is used and modified. As the default -channel setting is ‘ RGB,sync ‘, channels are modified together by the same gamma value, preserving colors.
This is a ‘perfect’ image normalization operator. It finds the exact minimum and maximum color values in the image and then applies a -level operator to stretch the values to the full range of values. On the other hand it is the right operator to use for color stretching gradient images being used to generate Color lookup tables, distortion maps, or other ‘mathematically’ defined images.
Command-line Tools: Convert @ ImageMagick
The operator is very similar to the -normalize-contrast-stretchand -linear-stretch operators, but without ‘histogram binning’ or ‘clipping’ problems that these operators may have. That is -auto-level is the perfect or ideal version these operators. It uses the -channel setting, including the special ‘ sync ‘ flag for channel synchronizationto determine which color values are used and modified.
This operator reads and resets the EXIF image profile setting ‘Orientation’ and then performs the appropriate 90 degree rotation on the image to orient the image, for correct viewing. This EXIF profile setting is usually set using a gravity sensor in digital camera, however photos taken directly downward or upward may not have an appropriate value.
Also images that have been orientation ‘corrected’ without reseting this setting, may be ‘corrected’ again resulting in a incorrect result.
If the EXIF profile was previously stripped, the -auto-orient operator will do nothing. This backdrop covers the entire workstation screen and is useful for hiding other X window activity while viewing the image. The color of the backdrop is specified as the background color.
The color is specified using the format described under the -fill option. The default background color if none is specified or found in the image is white. Repeat the entire command for the given number of iterations and report the user-time and elapsed time. For instance, consider the following command and its output. Modify the benchmark with the -duration to run the benchmark for a fixed number of seconds and -concurrent to run the benchmark in parallel requires the OpenMP feature.
In this example, 5 iterations were completed at 2. This is important for non-HDRI compilations of ImageMagick when dealing with convolutions that contain negative as well as positive values. This is especially the case with convolutions involving high pass filters or edge detection.
Without an output bias, the negative values are clipped at zero. Force to black all pixels below the threshold while leaving all pixels at or above the threshold unchanged. Blend will average the images together ‘plus’ according to the percentages given and each pixels transparency.
If only a single percentage value is given it sets the weight of the composite or ‘source’ image, while the background image is weighted by the exact opposite amount. Start with a factor of 1. Convolve the image with a Gaussian or normal distribution using the given Sigma value.
The Sigma value is the important argument, and determines the actual amount of blurring that will take place. The Radius is only used to determine the size of the array which will hold the calculated Gaussian distribution. It should be an integer. If not given, or set to zero, IM will calculate the largest possible radius that will provide meaningful results for the Gaussian distribution.
The larger the Radius the slower the operation is. However too small a Radiusand severe aliasing effects may result. As a guideline, Radius should be at least twice the Sigma value, though three times will produce a more accurate result.
This option differs from -gaussian-blur simply by taking advantage of the separability properties of the distribution. Here we apply a single-dimensional Gaussian matrix in the horizontal direction, then repeat the process in the vertical direction. The -virtual-pixel setting will determine how pixels which are outside the image proper are blurred into the final result. Set the width and height using the size portion of the geometry argument.
The -border operation is affected by the current -compose setting and assumes that this is using the default ‘ Over ‘ composition method. It generates an image of the appropriate size colors by the current -bordercolor before overlaying the original image in the center of this net image.
This means that with the default compose method of ‘ Over ‘ any transparent parts may be replaced by the current -bordercolor setting. Brightness and Contrast values apply changes to the input image. They are not absolute settings. A brightness or contrast value of zero means no change.