| Option |
Description |
| -alpha |
activate, deactivate, reset, or set the alpha channel |
| -antialias |
remove pixel-aliasing |
| -authenticate value |
decrypt image with this password |
| -backdrop |
background color |
| -background color |
background color |
| -border geometry |
surround image with a border of color |
| -bordercolor color |
border color |
| -channel type |
apply option to select image channels |
| -clip |
clip along the first path from the 8BIM profile |
| -clip-path id |
clip along a named path from the 8BIM profile |
| -coalesce |
merge a sequence of images |
| -colormap type |
Shared or Private |
| -colors value |
preferred number of colors in the image |
| -colorspace type |
set image colorspace |
| -comment string |
annotate image with comment |
| -compress type |
image compression type |
| -contrast |
enhance or reduce the image contrast |
| -crop geometry |
preferred size and location of the cropped image |
| -debug events |
display copious debugging information |
| -decipher filename |
convert cipher pixels to plain |
| -define format:option |
define one or more image format options |
| -delay value |
display the next image after pausing |
| -density geometry |
horizontal and vertical density of the image |
| -depth value |
image depth |
| -despeckle |
reduce the speckles within an image |
| -display server |
get image or font from this X server |
| -dispose method |
layer disposal method |
| -dither method |
apply error diffusion to image |
| -edge radius |
apply a filter to detect edges in the image |
| -endian type |
endianness (MSB or LSB) of the image |
| -enhance |
apply a digital filter to enhance a noisy image |
| -extract geometry |
extract area from image |
| -filter type |
use this filter when resizing an image |
| -flatten |
flatten a sequence of images |
| -flip |
flip image in the vertical direction |
| -flop |
flop image in the horizontal direction |
| -frame geometry |
surround image with an ornamental border |
| -fuzz distance |
colors within this distance are considered equal |
| -gamma value |
level of gamma correction |
| -geometry geometry |
preferred size or location of the image |
| -help |
print program options |
| -identify |
identify the format and characteristics of the image |
| -immutable type |
prohibit image edits |
| -interlace type |
type of image interlacing scheme |
| -interpolate method |
pixel color interpolation method |
| -label name |
assign a label to an image |
| -limit type value |
pixel cache resource limit |
| -log format |
format of debugging information |
| -map filename |
transform image colors to match this set of colors |
| -mattecolor color |
frame color |
| -monitor |
monitor progress |
| -monochrome |
transform image to black and white |
| -negate |
replace every pixel with its complementary color |
| -page geometry |
size and location of an image canvas (setting) |
| -profile filename |
add, delete, or apply an image profile |
| -quantize colorspace |
reduce image colors in this colorspace |
| -quiet |
suppress all warning messages |
| -raise value |
lighten/darken image edges to create a 3-D effect |
| -regard-warnings |
pay attention to warning messages. |
| -remote command |
execute a command in an remote display process |
| -resample geometry |
change the resolution of an image |
| -resize geometry |
resize the image |
| -respect-parenthesis |
settings remain in effect until parenthesis boundary. |
| -roll geometry |
roll an image vertically or horizontally |
| -rotate degrees |
apply Paeth rotation to the image |
| -sample geometry |
scale image with pixel sampling |
| -sampling-factor geometry |
horizontal and vertical sampling factor |
| -scene value |
image scene number |
| -seed value |
seed a new sequence of pseudo-random numbers |
| -segment values |
segment an image |
| -set attribute value |
set an image attribute |
| -sharpen geometry |
sharpen the image |
| -size geometry |
width and height of image |
| -strip |
strip image of all profiles and comments |
| -transparent-color color |
transparent color |
| -black-threshold value |
force all pixels below the threshold into black |
| -trim |
trim image edges |
| -update seconds |
detect when image file is modified and redisplay |
| -verbose |
print detailed information about the image |
| -version |
print version information |
| -virtual-pixel method |
access method for pixels outside the boundaries of the image |
| -visual |
display image using this visual type |
| -window id |
display image to background of this window |
| -window-group id |
exit program when this window id is destroyed |
| -write filename |
write images to this file |