| 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 method |
apply 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) |
| -pointsize value |
font point size |
| -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 |