imagemagick

• ImageMagick/ImageMagick
• https://www.imagemagick.org/
• https://www.imagemagick.org/script/formats.php
  • PNG, JPEG, GIF, HEIC, TIFF, DPX, EXR, WebP, Postscript, PDF, and SVG
• resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.

tip

• 新版本 convert, magick convert 命令被弃用，使用 magick 替代

# 添加 svg 和 opencl 支持
brew reinstall imagemagick

# 处理 SVG 也可以考虑 inkscape
# 但在 macos 下 xserver 显示的不太好
# brew cask info inkscape
#
magick hd.jpg -resize 1920x1080 hd_1080p.png
magick hd.jpg -resize 2048x1080 hd_2k.png
magick hd.jpg -resize 2048x hd_w2048.png

magick hd.jpg -resize 1080x hd_w1080.png

magick hd.jpg -fuzz 5% -trim +repage -alpha set -bordercolor none -border 48x48 -resize 1080x hd_w1080.png

# 照片保持原本的方向
magick hd.jpg -auto-orient -resize 1080x hd_w1080.png
# 正方形
magic input.jpg -auto-orient -gravity center --corp 1:1 output.png

• 裁剪
  • 显著性 Saliency
  • 熵 Entropy

参数顺序

资源 -> 输入选项 -> 输入文件 -> 输出选项 -> 输出文件

command	for
mogrify	批量转换, 原地修改
convert	转换格式

• https://www.imagemagick.org/script/mogrify.php

Convert

• http://www.imagemagick.org/script/convert.php

# -append 自上至下合并
# +append 自左至右合并
convert a.png b.png -append full.png

convert -resize ${resize}x${resize} -unsharp 1x4

mogrify -resize 16x12 -quality 100 -path ../new-thumbs *.jpg

# 合并 PDF
convert -density 150 *.pdf output.pdf
convert -density 600 file1.pdf file2.pdf -resize 50% new.pdf

# ghostscript
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=temp.pdf pdf1.pdf pdf2.pdf
# PDF Toolkit
pdftk pdf1.pdf pdf2.pdf cat output temp.pdf

magick mogrify -monitor -format jpg *.HEIC

Options

• -limit type value
  • width, height, area, memory, map, disk, file, thread, throttle, time
  • 默认 768 files, 3GB of image area, 1.5GiB memory, 3GiB memory map, and 18.45EB of disk
  • 当前限制 identify -list resource
  • memory - 限制内存上限
  • map - 限制内存映射上限
  • disk - 限制磁盘使用上限
  • area - 限制图像区域上限 - 超过这个限制的图像将被直接放到磁盘，避免一张图片就占用过多内存
  • thread - 限制线程数
• https://imagemagick.org/script/command-line-options.php

FAQ

The convert command is deprecated in IMv7, use "magick" instead of "convert" or "magick convert"

• convert, magick convert -> magick
• IM7

---

• convert, mogrify, identify, composite -> magick

Nonstandard tile width 2556, convert file.

• TIFF 的 tile width 和 tile length 不是 16 的倍数

Unknown field with tag ... encountered

Unknown field with tag 512 (0x200) encountered.
Unknown field with tag 513 (0x201) encountered.
Unknown field with tag 514 (0x202) encountered.
Unknown field with tag 515 (0x203) encountered.

• TIFFReadDirectory

tag	for
512	JPEGProc
513	JPEGInterchangeFormat
514	JPEGInterchangeFormatLength
515	JPEGRestartInterval

• JPEG-in-TIFF
• Accusoft ImageGear.NET
• https://help.accusoft.com/ImageGear-Net/v22.1/Windows/HTML/topic367.html

identify -verbose file.tif
exiftool file.tif