|
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.
Animate options can appear on the command line or in your X resources
file. See X(1). Options on the command line supersede values specified
in your X resources file.
| display the image centered on a backdrop. |
|
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. Refer to X Resources
for details.
|
| surround the image with a border of color |
|
See X(1) for details
about the geometry specification.
|
| megabytes of memory available to the pixel cache |
|
Image pixels are stored in memory until 80 megabytes of memory have been
consumed. Subsequent pixel operations are cached on disk. Operations to
memory are significantly faster but if your computer does not have a sufficient
amount of free memory you may want to adjust this threshold value.
|
|
-chop <width>x<height>{+-}<x offset>{+-}<y offset>{%}
|
| remove pixels from the interior of an image |
|
The width and height give the number of columns and rows to remove,
and the offsets give the location of the leftmost column and topmost
row to remove.
|
|
The -chop option removes entire rows and columns,
and moves the remaining corner blocks leftward and upward to close the gaps.
|
|
Choose between shared or private.
|
|
This option only applies when the default X server visual is PseudoColor
or GRAYScale. Refer to -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. |
| preferred number of colors in the image |
|
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 for
more details.
|
|
Note, options -dither, -colorspace, and -treedepth
affect the color reduction algorithm.
|
|
Choices are: GRAY, OHTA, RGB,
Transparent,
XYZ,
YCbCr, YIQ, YPbPr,
YUV, or CMYK.
|
|
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 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.
|
|
-crop <width>x<height>{+-}<x offset>{+-}<y offset>{%}
|
| preferred size and location of the cropped image |
|
See X(1) for details
about the geometry specification.
|
|
The width and height give the size of the image that remains after cropping,
and the offsets give the location of the top left corner of the cropped
image with respect to the original image. To specify the amount to be
removed, use -shave instead.
|
|
To specify a percentage width or height to be removed instead, append
%. For example
to crop the image by ten percent (five percent on each side of the image),
use -crop 10%.
|
|
Use cropping to apply image processing options to, or display, a particular
area of an image.
|
|
Omit the x and y offset to generate one or more subimages of a uniform
size.
|
|
Use cropping to crop a particular area of an image. Use -crop 0x0
to trim edges that are the background color. Add an x and y offset to leave
a portion of the trimmed edges with the image.
|
| display the next image after pausing |
|
This option is useful for regulating the animation of GIF images
within Netscape. Delay/100 seconds must expire
before the display
of the next image. The default is no delay between each showing of the
image sequence. The maximum delay is 65535.
|
|
You can specify a delay range (e.g. -delay 10-500) which sets the
minimum and maximum delay.
|
| vertical and horizontal resolution in pixels of the image |
|
This option specifies an image density when decoding a PostScript
or Portable Document page. The default is 72 dots per inch in the horizontal
and vertical direction. This option is used in concert with -page.
|
|
This is the number of bits in a pixel. The only acceptable
values are 8 or 16. Use this option to specify the depth of raw images whose
depth is unknown such as GRAY, RGB, or CMYK, or to change the depth of any
image after it has been read.
|
| specifies the X server to contact |
|
Here are the valid methods:
|
0 No disposal specified.
1 Do not dispose between frames.
2 Overwrite frame with background color from header.
3 Overwrite with previous frame.
| apply Floyd/Steinberg error diffusion to the image |
|
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 or -monochrome option is required for this option
to take effect.
|
|
Use +dither to render Postscript without text or graphic aliasing.
|
| use this font when annotating the image with text |
|
You can tag a font to specify whether it is a Postscript, Truetype, or OPTION1
font. For example, Arial.ttf is a Truetype font, ps:helvetica
is Postscript, and x:fixed is OPTION1.
|
| define the foreground color |
| level of gamma correction |
|
The same color image displayed on two different workstations may look different
due to differences in the display monitor. Use gamma correction to adjust
for this color difference. Reasonable values extend from 0.8 to
2.3.
|
|
You can apply separate gamma values to the red, green, and blue channels
of the image with a gamma value list delineated with slashes
(i.e. 1.7/2.3/1.2).
|
|
Use +gamma value
to set the image gamma level without actually adjusting
the image pixels. This option is useful if the image is of a known gamma
but not set as an image attribute (e.g. PNG images).
|
|
-geometry <width>x<height>{+-}<x offset>{+-}<y offset>{%}{@}{!}{<}{>}
|
| preferred size and location of the Image window. |
|
See X(1) for details
about the geometry specification. By default, the window size is the image
size and the location is chosen by you when it is mapped.
|
|
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 specify the maximum area in pixels of an image.
|
|
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.
|
|
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.
|
|
There are 72 pixels per inch in PostScript coordinates.
|
| specify the icon geometry |
| the type of interlacing scheme |
|
Choices are: None, Line, Plane,
or Partition. The default is None.
|
|
This option is used to specify the type of interlacing scheme for raw image
formats such as RGB or YUV. None 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 PNG or GIF or
progressive JPEG image.
|
|
display image using this type. |
|
Choose from these Standard Colormap types: |
best
default
gray
red
green
blue
|
The X server must support the Standard Colormap you choose,
otherwise an error occurs. Use list as the type and display
searches the list of colormap types in top-to-bottom order until
one is located. See xstdcmap(1) for one way of creating Standard
Colormaps. |
| store matte channel if the image has one |
|
If the image does not have a matte channel, create an opaque one.
|
| transform the image to black and white |
| pause between animation loops |
|
Pause for the specified number of seconds before repeating the
animation. |
| perform a remote operation |
|
The only command recognized at this time is the name of
an image file to load.
|
| apply Paeth image rotation to the image |
|
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 background (class backgroundColor). See X(1)
for details.
|
| image scene number or range |
|
Use this option to specify an image sequence with a single filename. See
the discussion of file below for details. |
|
This resource specifies whether the utility should attempt use shared memory
for pixmaps. ImageMagick must be compiled with shared memory support,
and the display must support the MIT-SHM extension. Otherwise, this
resource is ignored. The default is True.
|
|
-size <width>x<height>{+offset}
|
| width and height of the image |
|
Use this option to specify the width and height of raw images whose dimensions
are unknown such as GRAY,
RGB, or CMYK. In addition
to width and height, use
-size with an offset to skip any header information in
the image or tell the number of colors in a MAP image
file, (e.g. -size 640x512+256).
|
|
For Photo CD images, choose from these sizes: |
192x128
384x256
768x512
1536x1024
3072x2048
|
Finally, use this option to choose a particular resolution layer of a JBIG
or JPEG image (e.g. -size 1024x768).
|
| font for writing fixed-width text |
|
Specifies the name of the preferred font to use in fixed (typewriter style)
formatted text. The default is 14 point Courier.
|
|
You can tag a font to specify whether it is a Postscript, Truetype, or
OPTION1 font. For example, Courier.ttf is a Truetype font
and x:fixed is OPTION1.
|
| assign a title to the displayed image |
|
Use this option to assign a specific title to the image. This is assigned
to the image window and is typically displayed in the window title bar.
Optionally you can include the image filename, type, width, height, or
other image attribute by embedding special format characters: |
%b file size
%c comment
%d directory
%e filename extention
%f filename
%h height
%i input filename
%k number of unique colors
%l label
%m magick
%n number of scenes
%o output filename
%p page number
%q quantum depth
%s scene number
%t top of filename
%u unique temporary filename
%w width
%x x resolution
%y y resolution
\n newline
\r carriage return
-title "%m:%f %wx%h"
|
produces an image title of MIFF:bird.miff 512x480 for an image
titled bird.miff and whose width is 512 and height is 480.
|
| tree depth for the color reduction algorithm |
|
Normally, this integer value is zero or one. A zero or one tells display
to choose an optimal tree depth for the color reduction algorithm |
|
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 for more details.
|
|
The -colors or -monochrome option is required for this option
to take effect.
|
| print detailed information about the image |
|
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 transform the image.
Refer to miff for a description of the image class.
|
|
If -colors is also specified, the total unique colors in the image
and color reduction error values are printed. Refer to quantize
for a description of these values.
|
| animate images using this X visual type |
|
Choose from these visual classes:
|
StaticGray
GrayScale
StaticColor
PseudoColor
TrueColor
DirectColor
default
visual id
|
The X server must support the visual you choose, otherwise an error occurs.
If a visual is not specified, the visual class that can display the most
simultaneous colors on the default screen is chosen.
|
| make image the background of a window |
|
id can be a window id or name. Specify root to
select X's root window as the target window.
|
|
By default the image is tiled onto the background of the target
window. If backdrop or -geometry are
specified, the image is surrounded by the background color. Refer to
X RESOURCES for details.
|
|
The image will not display on the root window if the image has more
unique colors than the target window colormap allows. Use
-colors to reduce the number of colors.
|
|