composite命令可以非常方便的合并兩張圖片

因此用來進行圖像加水印、批量增加邊框等常用的變換

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最簡單的用法為：

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composite -gravity north src.jpg coverback.jpg des.jpg

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其中src.jpg為前景圖片

coverback.jpg為背景圖片。

des.jpg為疊加后的結果

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-gravity north 指疊加位置為垂直據頂部、水平居中（正北方向）

如果要求在正中間，參數為center

如果要求在右下角，參數為southeast

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composite還提供更靈活的定位，可以使用 -geometry 配置

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具體的composite參數表見下表

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? -affine?matrix	affine transform matrix
-alpha	on, activate, off, deactivate, set, opaque, copy", transparent, extract, background, or shape 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 each 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-parentheses	settings remain in effect until parenthesis boundary.
-rotate?degrees	apply Paeth rotation to the image
-sampling-factorgeometry	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
-stereo?geometry	combine two image to create a stereo anaglyph
-strip	strip image of all profiles and comments
-swap?indexes	swap two images in the image sequence
-synchronize	synchronize image to storage device
-taint	mark the image as modified
-thumbnail?geometry	create a thumbnail of the image
-tile	repeat composite operation across and down image
-transform	affine transform image
-transparent-colorcolor	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
-watermarkgeometry	percent brightness and saturation of a watermark
-white-point?point	chromaticity white point
-white-thresholdvalue	force all pixels above the threshold into white
-write?filename	write images to this file

本文轉自博客園知識天地的博客，原文鏈接：用imageMagick的composite合并圖片，如需轉載請自行聯系原博主。

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