Aragis The fix for me was finding the tmp directory and setting the correct permissions for it. Sign up using Facebook. It always gives an exception in the readImage command when index is around 15 jmagick higher depending on the source PDF. It always works fine for the first 10 images, but starting at index X and thereafter it always gets an exception. As described in my answer: Does it work with a simple convert command line? I just encountered a similar issue.
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Image Stack Image Setting An image setting persists as it appears on the command-line and may affect subsequent processing such as reading an image, an image operator, or when writing an image as appropriate.
An image setting stays in effect until it is reset or the command-line terminates. The image settings include: In this example, -channel applies to each of the images, since, as we mentioned, settings persist: magick -channel RGB wand. An operator is any command-line option not listed as a image setting or image sequence operator. Unlike an image setting, which persists until the command-line terminates, an operator is applied to the current image set and forgotten.
The image operators include: In this example, -negate negates the wand image but not the wizard: magick wand. However, some frames may be smaller than the whole image and resizing all the frames into the same size may result in an unexpected output. Choose from these image sequence operators: In this example, -append appends three images into one: magick mikayla.
Because users want so many variations on the resulting dimensions, sizes, and positions of images and because ImageMagick wants to provide them , the geometry argument can take many forms. We describe many of these in this section. The image options and settings that take some form of a geometry argument include the following. Keep in mind that some of these parse their arguments in slightly different ways. See the documentation for the individual option or setting for more specifics.
These will described in more detail in the subsections following the table. The usual form is size[offset], meaning size is required and offset is optional. Occasionally, [size]offset is possible. In no cases are spaces permitted within the geometry argument. Width and height emphatically given, original aspect ratio ignored. Aspect ratio is preserved. Signs are required for both. This fine image is pixels wide and pixels high. We say its dimensions are x When we give dimensions of an image, the width the horizontal dimension always precedes the height the vertical dimension.
This will be true when we speak of coordinates or offsets into an image, which will always be x—value followed by y. Just think of your high school algebra classes and the xy—plane.
Well, almost: our y—axis will always go downward! The resulting image in this example has dimensions x By default, the width and height given in a geometry argument are maximum values unless a percentage is specified. That is, the image is expanded or contracted to fit the specified width and height value while maintaining the aspect ratio the ratio of its height to its width of the image. For instance, the third command above "tries" to set the dimensions to x Imagine gradually shrinking the original image which is x , keeping is aspect ratio constant, until it just fits into a x rectangle.
Since the image is longer than it is tall, it will fit when its width shrinks to pixels. Notice that in the previous example, at least one of the specified dimensions will be attained in this case, the width, pixels. The resulting image fits snugly within the original. Here the geometry argument gives minimum values. We see that ImageMagick is very good about preserving aspect ratios of images, to prevent distortion of your favorite photos and images.
But you might really want the dimensions to be x, thereby stretching the image. In this case just tell ImageMagick you really mean it! This will force the image size to exactly what you specify. So, for example, if you specify x! When only the width is specified, as in the first example above, the width is accepted as given and the height is chosen to maintain the aspect ratio of the input image.
Similarly, if only the height is specified, as in the second example above, the height is accepted and the width is chosen to maintain the aspect ratio.
However, in the fourth example above, there will be no change to its size. Finally, use to specify the maximum area in pixels of an image, again while attempting to preserve aspect ratio. Pixels take only integer values, so some approximation is always at work. In the following example, an area of pixels is requested. The resulting file has dimensions x86, which has pixels. Doing so is optional in many cases, but not always. To be safe, one should probably maintain a habit of enclosing all geometry arguments in quotes, as we have here.
Offsets in geometry Here are some examples to illustrate the use of offsets in geometry arguments. This option allows many other options to modify the pixels within a specified rectangular subregion of an image. As such, it needs to be given the width and height of that region, and also an offset into the image, which is a pair of coordinates that indicate the location of the region within the larger image.
The offset is not actually a true location within the image; its coordinates must be added to some other location. In the first two examples above, though, that location is the upper-left hand corner of the image, which has coordinates 0,0.
That is the default situation when there are no other directives given to change it. A negative offset can make sense in many cases. In this case that is at pixel , , since the size of the image is x Therefore the center of the x rectangle is moved to , Image Stack In school, your teacher probably permitted you to work on problems on a scrap of paper and then copy the results to your test paper. An image stack is similar.
It permits you to work on an image or image sequence in isolation and subsequently introduce the results back into the command-line. The image stack is delineated with parenthesis. Image operators only affect images in the current stack. For example, we can limit the image rotation to just the wizard image like this: magick wand. This is required under Unix, where parentheses are special shell characters.
The backslash tells the shell not to interpret these characters, but to pass them directly to the command being executed. Do not escape the parentheses under Windows. Each parenthesis or escaped parenthesis must have spaces on either side, as in the example shown above. However if you give a negative index, the images are indexed from the end last image added. That is, an index of -1 is the last image in the current image sequence, -2 gives the second-to-last, and so on. Output Filename ImageMagick extends the concept of an output filename to include: an explicit image format.
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