to convert PDF into Images. This works good for teh most files. But there is a problem with antialias (i think). When i zoom in the output image i. Well I’m trying to make the image’s edges soften so they don’t look sharp ( transparent background), and I can’t seem to get it to work. Have you tried setting -background Red -alpha Background? I suspect that the background color is defaulting to black, which is then being blurred with the red.
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Display is a machine architecture independent image processing and display program. It can display an image on any workstation display running an X server. Import reads an image from any visible window on an X server and outputs it as an image file. You can capture a single window, the entire screen, or any rectangular portion of the screen. Montage creates a composite by combining several separate images. The images are tiled on the composite image with the name of the image optionally appearing just below the individual tile.
Convert converts an input file using one image format to an output file with a differing image format. Mogrify transforms an image or a sequence of images. These transforms include image scalingimage rotationcolor reductionand others. The transmogrified image overwrites the original image.
Identify describes the format and characteristics of one or more image files. It will also report if an image is incomplete or corrupt. Composite composites images to create new images. The ImageMagick utilities recognize the following image formats: Your installation might not support all of the formats in the list. To get an up-to-date listing of the formats supported by your particular configuration, run “convert -list format”.
Raw images are expected to have one byte per pixel unless ImageMagick is compiled in the default bit mode or in bit mode. Here, the raw data is expected to be stored two bytes per pixel in most-significant-byte-first order. You can tell if ImageMagick was compiled in bit mode by typing “convert” without any options, and looking for “Q: By default, the image format is determined by its magic antialiws, i.
To specify a particular image format, precede the filename with an image format name and a colon i. The magic number takes precedence over the filename suffix and the prefix takes precedence over the magic number and the suffix in input files. The prefix takes precedence over the filename suffix in output files. To read the XC format, follow the colon with a color specification. When you specify X as your image type, the filename has special meaning.
It specifies an X window by id, nameor root.
If no filename is specified, the window is selected by clicking the mouse in the desired window. Finally, when running on platforms that allow it, precede the ahtialias file name with to pipe to or from a system command this feature is not available on VMS, Win32 and Macintosh platforms.
Use a backslash or quotation marks to prevent your shell from interpreting the. Use an optional index enclosed in brackets after an input file name to specify a desired subimage of a multi-resolution image format like Photo CD e. A subimage specification can be disjoint e. For raw images, specify a subimage with a geometry e.
Surround the image name with quotation marks to prevent your shell from interpreting the square brackets. Single images are written with the filename you specify. However, multi-part images e.
When running a commandline utility, you can prepend an at sign to a filename to read a list of image filenames from that file. This is convenient in the event you have too many image filenames to fit on the command line. Options are processed in command line order. Any option you specify on the command line remains in effect for the set of images that follows, until the set is terminated by the appearance of any option or -noop.
Some options only affect the decoding of images and others only the encoding. The latter can appear after the final group of input images. This is a combined list of the commandline options used by the ImageMagick utilities animate, composite, convert, display, identify, import, mogrify and montage.
However, some formats e. JPEG do not support more than one image and are saved to separate files. Reasons to disable antialiasing include avoiding increasing colors in the image, or antiwlias rendering speed. If they are not of the same width, any narrow images will be expanded to fit using the background color. The set of images is terminated by the appearance of imagemagicck option. If the -append option appears after all of the input images, all images are appended.
Problem with antialias when converting PDF to Images – ImageMagick
Encrypting images being written is not supported. If the -average option appears after all of the input images, all images are averaged. 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 in the “Color Names” section of X 1. Refer to X Resources for details. See -draw for further details. Use this option to extract a particular channel from the image.
Mattefor example, is useful for extracting the opacity values from an image. The x offset normally specifies the leftmost column to remove. If the -gravity option is present with NorthEast, East, or SouthEast gravity, it gives the distance leftward from the right edge of the image to the rightmost column to remove. Similarly, the y offset normally specifies the topmost row to remove, but if the -gravity option is present with SouthWest, South, or SouthEast gravity, it specifies the distance upward from the bottom edge of the image to the bottom row to remove.
The -chop option removes entire rows and columns, and moves the remaining corner blocks leftward and upward to close the gaps.
For example, if you type the following command: The -clip feature requires the XML library. If the XML library is not present, the option is ignored. If the -coalesce option appears after all of the input images, all images are coalesced. You can apply separate colorization values to the red, green, and blue channels of the image with a colorization value list delimited with slashes e.
Refer antialkas -visual for more details. By default, a shared colormap is allocated. The image shares colors with other X clients.
Some image colors could be approximated, therefore your image may look very different than intended. Choose Private and the image colors appear exactly as they are defined. However, other clients may go technicolor when the image colormap is installed.
Note, this is a color reduction antualias. Images with less unique colors than specified with this option will have any duplicate or unused colors removed. Refer to quantize for more details. Note, options -dither-colorspaceand -treedepth affect the color reduction algorithm. Color reduction, by default, takes place in the RGB color space. These color spaces may give better results when color reducing an image.
The Transparent color space behaves uniquely in that it preserves the matte channel of the image if it exists.
The -colors or -monochrome option is required for this option to take effect. You can include the image filename, type, width, height, or other image attribute by embedding special format characters listed under the -format option.
The comment is not drawn on the image, but is embedded in the image datastream via a “Comment” tag or similar mechanism. If you want the comment to be visible on the image itself, use the -draw option. If the first character of string isthe image comment is read from a file titled by the remaining characters in the string.
You can choose an alternate composite operation: Over The result will be the union of the two image shapes, with opaque areas of composite image obscuring image in the region of overlap.
In The result is simply composite image cut by the shape of image. None of the image data of image will be in the result. Out The resulting image is composite image with the shape of image cut out. Atop The result is the same shape as image imagewith composite image obscuring image where the image shapes overlap.
transparency – How do I avoid this ImageMagick anti-aliasing discoloration? – Stack Overflow
Note this differs from over because the portion of composite image outside image ‘s shape does not appear in the result. Xor The result is the image data from both composite image and image that is outside the overlap region. The overlap region will be blank. Plus The result is just the sum of the image data. Output values are cropped to no overflow. This operation is independent of the matte channels. Minus The result of composite image – imagewith underflow cropped to zero.
The matte channel is ignored set tofull coverage. Subtract The result of composite image – imagewith underflow wrapping around mod