The target window can be specified by id, name, or may be selected by clicking the mouse in the desired window. If you press a button and then drag, a rectangle will form which expands and contracts as the mouse moves. To save the portion of the screen defined by the rectangle, just release the button. The keyboard bell is rung once at the beginning of the screen capture and twice when it completes.
To select an X window with the mouse and save it in the MIFF image format to a file titled window.miff, use:
import window.miff
To select an X window and save it in the Encapsulated Postscript format to include in another document, use:
import figure.eps
To capture the entire X server screen in the JPEG image format in a file titled root.jpeg, use:
import -window root root.jpeg
The actual number of colors in the image may be less than your request, but never more. Note, this is a color reduction option. Images with less unique colors than specified with this option will have any duplicate or unused colors removed. Refer to quantize(9) for more details.
Note, options -dither, -colorspace, and -treedepth affect the color reduction algorithm.
Color reduction, by default, takes place in the RGB color space. Empirical evidence suggests that distances in color spaces such as YUV or YIQ correspond to perceptual color differences more closely than do distances in RGB space. These color spaces may give better results when color reducing an image. Refer to quantize(9) for more details.
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.
By default, each image is commented with its file name. Use this option to assign a specific comment to the image. Optionally you can include the image filename, type, width, height, or scene number by embedding special format characters. Embed %f for filename, %d for directory, %e for filename extention, %t for top of filename, %m for magick, %w for width, %h for height, %s for scene number, %b for file size, or \n for newline. For example,
-comment "%m:%f %wx%h"
produces an image comment of MIFF:bird.miff 512x480 for an image titled bird.miff and whose width is 512 and height is 480.
If the first character of string is @, the image comment is read from a file titled by the remaining characters in the string.
Specify +compress to store the binary image in an uncompressed format. The default is the compression type of the specified image file.
To specify a percentage width or height instead, append %. For example to crop the image by ten percent on all sides of the image, use -crop 10%.
Use cropping to crop a particular area of an image. Use -crop 0x0 to remove edges that are the background color.
This option is useful when you need time to ready the target window before it is captured to a file.
This option specifies an image density when decoding a Postscript or Portable Document page. The default is 72 pixels per inch in the horizontal and vertical direction. This option is used in concert with -page.
Here are the valid methods:
0 No disposal specified.
1 Do not dispose.
2 Restore to background color.
3 Restore to previous.
The basic strategy of dithering is to trade intensity resolution for spatial resolution by averaging the intensities of several neighboring pixels. Images which suffer from severe contouring when reducing colors can be improved with this option.
The -colors option is required for dithering to take effect.
By default, the width and height are maximum values. That is, the image is expanded or contracted to fit the width and height value while maintaining the aspect ratio of the image. Append an exclamation point to the geometry to force the image size to exactly the size you specify. For example, if you specify 640x480! the image width is set to 640 pixels and height to 480. If only one factor is specified, both the width and height assume the value.
To specify a percentage width or height instead, append %. The image size is multiplied by the width and height percentages to obtain the final image dimensions. To increase the size of an image, use a value greater than 100 (e.g. 125%). To decrease an image's size, use a percentage less than 100.
Use > to change the dimensions of the image only if its size exceeds the geometry specification. < resizes the image only if its dimensions is less than the geometry specification. For example, if you specify 640x480> and the image size is 512x512, the image size does not change. However, if the image is 1024x1024, it is resized to 640x480.
This option is used to specify the type of interlacing scheme for raw image formats such as RGB or YUV. No means do not interlace (RGBRGBRGBRGBRGBRGB...), Line uses scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...), and Plane uses plane interlacing (RRRRRR...GGGGGG...BBBBBB...). Partition is like plane except the different planes are saved to individual files (e.g. image.R, image.G, and image.B).
Use Line, or Plane to create an interlaced GIF or progressive JPEG image. -label name assign a label to an image.
Use this option to assign a specific label to the image. Optionally you can include the image filename, type, width, height, or scene number in the label by embedding special format characters. Embed %f for filename, %d for directory, %e for filename extention, %t for top of filename, %m for magick, %w for width, %h for height, or %s for scene number, %b for file size in kilobytes, or \n for newline. For example,
-label "%m:%f %wx%h"
produces an image label of MIFF:bird.miff 512x480 for an image titled bird.miff and whose width is 512 and height is 480.
If the first character of string is @, the image label is read from a file titled by the remaining characters in the string.
When converting to Postscript, use this option to specify a header string to print above the image. Specify the label font with -font.
The red, green, and blue intensities of an image are negated. Use +negate to only negate the grayscale pixels of the image.
Use this option to specify the dimensions of the Postscript page in dots per inch or a TEXT page in pixels. The choices for a Postscript page are:
Letter 612x 792
Tabloid 792x1224
Ledger 1224x 792
Legal 612x1008
Statement 396x 612
Executive 540x 720
A3 842x1190
A4 595x 842
A5 420x 595
B4 729x1032
B5 516x 729
Folio 612x 936
Quarto 610x 780
10x14 720x1008
For convenience you can specify the page size by media (e.g. A4, Ledger, etc.). Otherwise, -page behaves much like -geometry (e.g. -page letter+43+43>).
To position a GIF image, use -page {+-}<x offset>{+-}<y offset> (e.g. -page +100+200). For a Postscript page, the image is sized as in -geometry and positioned relative to the lower left hand corner of the page by {+-}<x offset>{+-}<y offset>. The default is to center the image within the page. If the image size exceeds the Postscript page, it is reduced to fit the page.
The default page dimensions for a TEXT image is 612x792.
This option is used in concert with -density.
For the JPEG image format, quality is 0 (worst) to 100 (best). The default quality is 75.
Quality for the MIFF and PNG image format sets the amount of image compression (quality / 10) and filter-type (quality % 10). Compression quality values range from 0 (worst) to 100 (best). If filter-type is 4 or less, the specified filter-type is used for all scanlines:
0: none
1: sub
2: up
3: average
4: Paeth
If filter-type is 5, adaptive filtering is used when quality is greater than 50 and the image does not have a color map, otherwise no filtering is used.
If filter-type is 6 or more, adaptive filtering with minimum-sum-of-absolute-values is used.
The default is quality is 75. Which means nearly the best compression with adaptive filtering.
For further information, see the PNG specification (RFC 2083), <http://www.w3.org/pub/WWW/TR>.
Use > to rotate the image only if its width exceeds the height. < rotates the image only if its width is less than the height. For example, if you specify -90> and the image size is 480x640, the image is not rotated by the specified angle. However, if the image is 640x480, it is rotated by -90 degrees.
Empty triangles left over from rotating the image are filled with the color defined as bordercolor (class borderColor).
An optimal depth generally allows the best representation of the source image with the fastest computational speed and the least amount of memory. However, the default depth is inappropriate for some images. To assure the best representation, try values between 2 and 8 for this parameter. Refer to quantize(9) for more details.
The -colors option is required for this option to take effect.
This information is printed: image scene number; image name; image size; the image class (DirectClass or PseudoClass); the total number of unique colors; and the number of seconds to read and write the image.
With this option you can specify the target window by id or name rather than using the mouse. Specify 'root' to select X's root window as the target window.
Options are processed in command line order. Any option you specify on the command line remains in effect until it is explicitly changed by specifying the option again with a different effect.
file specifies the image filename. If file is omitted, it defaults to magick.ps. The default image format is Postscript. To specify a particular image format, precede the filename with an image format name and a colon (i.e. gif:image) or specify the image type as the filename suffix (i.e. image.jpg). See convert(1) for a list of valid image formats.
Specify file as - for standard output. If file has the extension .Z or .gz, the file size is compressed using with compress or gzip respectively. Precede the image file name | to pipe to a system command. If file already exists, you will be prompted as to whether it should be overwritten.
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