Option |
Description |
-affine matrix |
affine transform matrix |
-alpha |
activate, deactivate, reset, or set the alpha channel |
-authenticate value |
decrypt image with this password |
-blend geometry |
blend images |
-blue-primary point |
chromaticity blue primary point |
-border geometry |
surround image with a border of color |
-bordercolor color |
border color |
-channel type |
apply option to select image channels |
-colors value |
preferred number of colors in the image |
-colorspace type |
set image colorspace |
-comment string |
annotate image with comment |
-compose operator |
set image composite operator |
-compress type |
image compression type |
-debug events |
display copious debugging information |
-decipher filename |
convert cipher pixels to plain |
-define format:option |
define one or more image format options |
-density geometry |
horizontal and vertical density of the image |
-depth value |
image depth |
-displace geometry |
shift image pixels defined by a displacement map |
-dissolve value |
dissolve the two images a given percent |
-dither |
apply Floyd/Steinberg error diffusion to image |
-encipher filename |
convert plain pixels to cipher pixels |
-encoding type |
text encoding type |
-endian type |
endianness (MSB or LSB) of the image |
-extract geometry |
extract area from image |
-filter type |
use this filter when resizing an image |
-font name |
render text with this font |
-geometry geometry |
preferred size or location of the image |
-gravity type |
horizontal and vertical text placement |
-green-primary point |
chromaticity green primary point |
-help |
print program options |
-identify |
identify the format and characteristics of the image |
-interlace type |
type of image interlacing scheme |
-interpolate method |
pixel color interpolation method |
-label string |
assign a label to an image |
-level value |
adjust the level of image contrast |
-limit type value |
pixel cache resource limit |
-log format |
format of debugging information |
-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 |
-quality value |
JPEG/MIFF/PNG compression level |
-quantize colorspace |
reduce image colors in this colorspace |
-quiet |
suppress all warning messages |
-red-primary point |
chromaticity red primary point |
-regard-warnings |
pay attention to warning messages. |
-respect-parenthesis |
settings remain in effect until parenthesis boundary. |
-rotate degrees |
apply Paeth rotation to the image |
-sampling-factor geometry |
horizontal and vertical sampling factor |
-scene value |
image scene number |
-seed value |
seed a new sequence of pseudo-random numbers |
-set attribute value |
set an image attribute |
-sharpen geometry |
sharpen the image |
-shave geometry |
shave pixels from the image edges |
-size geometry |
width and height of image |
-stegano offset |
hide watermark within an image |
-strip |
strip image of all profiles and comments |
-swap indexes |
swap two images in the image sequence |
-thumbnail geometry |
create a thumbnail of the image |
-tile |
repeat composite operation across and down image |
-transform |
affine transform image |
-transparent-color color |
transparent color |
-treedepth value |
color tree depth |
-type type |
image type |
-units type |
the units of image resolution |
-unsharp geometry |
sharpen the image |
-verbose |
print detailed information about the image |
-version |
print version information |
-virtual-pixel method |
access method for pixels outside the boundaries of the image |
-watermark geometry |
percent brightness and saturation of a watermark |
-white-point point |
chromaticity white point |
-white-threshold value |
force all pixels above the threshold into white |
-write filename |
write images to this file |