The tools we’ll be using are =GIMP= and =mogrify= (from the ImageMagick suite),
so make sure that you have them installed.
We’ll use GIMP to graphically select the area to be cropped
and the mogrify tool to automate the cropping, saving us a lot of work. Let’s start with the selecting:
Getting the right cropping values using GIMP

In 5 steps:
Where to find the cropping values
1. Open up GIMP.
2. Open one of the images in GIMP.
3. Using the Rectangle Select Tool (hotkey “R”), select the area you want to be cropped.
4. Note the X, Y, Width and Height values GIMP gives you
(have a look at the picture, you can find them in the GIMP main window).
5. Close GIMP (or leave it open if you plan to use it again soon).

We now have the values we need to tell the mogrify utility what to crop.
Let’s go on and write a line that’ll execute mogrify in such a way that it’ll crop all our images!
Cropping the images

Now we’ll start working in the terminal.
Open up your favourite one and change directory to the directory
where the images are located.
Note that I strongly recommend having only the images that are to be cropped in the directory, nothing more.
It saves you a lot of trouble. Well then, let’s start with the mogrify command.
The syntax for cropping is as follows:

>> mogrify -crop {Width}x{Height}+{X}+{Y} image.png

Now don’t be scared, the {Width}, {Height} and so on simply are the places where you should put the values you got from GIMP! Note that I use a png file as an example, while mogrify is able to handle over 100 image file types. You don’t have to use png files with it. Anyway, if I’d fill in the values from the screenshot, the mogrify command would look like this:

>> mogrify -crop 643×393+7+83 image.png

The logic behind this system is the following:
crop an area of 643 by 393 pixels, starting at 7 pixels from the left and 83 pixels from the top of the image. Got it?
Ok then.
The above command would overwrite image.png with a cropped version.
But this still manipulates just a single image.
The easiest way to make mogrify modify all images is just this:

>> mogrify -crop 643×393+7+83 *.png

The asterisk makes bash fill in all png files in the current directory, and mogrify will handle them all happily. After a (hopefully short) wait, all the images will have been cropped. If you want to crop images of an other format, just change “*.png” to, for example, “*.jpg” or “*.gif”.

You might want to give the cropped images other names, so that the original images will not be overwritten and it will be clear which images have been cropped and which haven’t. This is more complex, but hey, we’re working on Linux! Everything is possible if you take the time to write it.
Renaming the cropped images

In order to give the cropped images other names, we’ll use a bash loop. This time, we’ll use the convert utility. It is from the same family as mogrify, but it makes it easier for us to output to an other filename. I won’t explain the whole loop, as most of it is bash knowledge, but I will tell you which things you can/should alter to get the right results. There are loops for two cases, just pick the one of which you like the file naming the most.

Case 1: You want the output files to be named like this: originalfile.png => cropped_originalfile.png (again, you can insert any of the over 100 supported image formats here, I just like png). The loop should be like this:

$ for file in *.png; do convert -crop {Width}x{Height}+{X}+{Y} $file cropped_$file; done

You should replace “png” with the extension you want (think of jpg, gif, png (of course) and so on), and the “{Width}”, “{Height}” etc with the values you got from GIMP. You may also replace “cropped_” with any prefix you like.
    Case 2: You want the output files to be named like this: originalfile.png => originalfile_cropped.png (or originalfile.jpg => originalfile_cropped.jpg, you name it). In that case, you should use the following loop:

$ for file in *.png; do convert -crop {Width}x{Height}+{X}+{Y} $file ${file%.png}_cropped.png; done

Again, replace “png” with the extension you want (watch it, there are 3 instances of it) and the “{Width}”, “{Height}” etc with the values you got from GIMP. You can also replace “_cropped” with any suffix you like.

Note that you can, in this case, easily modify the output format: if you want to output the cropped images in jpg format, you can just replace the third instance of “png” with “jpg”, no matter what format your input files are. The convert utility will detect it and change the image format automatically.

Cropping multiple images the same way的更多相关文章

  1. Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define ...

    Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define ... 这个错误是因为有两个相 ...

  2. POJ 2356. Find a multiple 抽屉原理 / 鸽巢原理

    Find a multiple Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7192   Accepted: 3138   ...

  3. [LeetCode] Read N Characters Given Read4 II - Call multiple times 用Read4来读取N个字符之二 - 多次调用

    The API: int read4(char *buf) reads 4 characters at a time from a file. The return value is the actu ...

  4. SharePoint "System.Data.SqlClient.SqlException (0x80131904): Parameter '@someColumn' was supplied multiple times.“

    最近在处理SharePoint Office365的相关开发的时候发现了这样一个奇怪的现象: 无法通过API更新Editor field,只要已更新就会throw Exception,由于是Offic ...

  5. 2012Chhengdu K - Yet Another Multiple Problem

    K - Yet Another Multiple Problem Time Limit:20000MS     Memory Limit:65536KB     64bit IO Format:%I6 ...

  6. JAVA实现AES 解密报错Input length must be multiple of 16 when decrypting with padded cipher

    加密代码 /**解密 * @param content 待解密内容 * @param password 解密密钥 * @return */ public static byte[] decrypt(b ...

  7. scala - multiple overloaded alternatives of method bar define default arguments

    同名同位置默认参数不能overload def bar(i:Int,s:String="a"){} def bar(i:String,s:String="b") ...

  8. 基于Picture Library创建的图片文档库中的上传多个文件功能(upload multiple files)报错怎么解决?

    复现过程 首先,我创建了一个基于Picture Library的图片文档库,名字是 Pic Lib 创建完毕后,我点击它的Upload 下拉菜单,点击Upload Picture按钮 在弹出的对话框中 ...

  9. 多文档上传(upload multiple documents)功能不能使用怎么办?

    问题描述: 在SharePoint 2010的文档库里选择documents标签,然后选择upload document下拉菜单,你会发现upload multiple documents那个按钮是灰 ...

随机推荐

  1. 【POJ - 1458】Common Subsequence(动态规划)

    Common Subsequence Descriptions: A subsequence of a given sequence is the given sequence with some e ...

  2. 递推DP UVA 607 Scheduling Lectures

    题目传送门 题意:教授给学生上课,有n个主题,每个主题有ti时间,上课有两个限制:1. 每个主题只能在一节课内讲完,不能分开在多节课:2. 必须按主题顺序讲,不能打乱.一节课L时间,如果提前下课了,按 ...

  3. Windows查杀端口

    Windows环境下当某个端口被占用时,通过netstat命令进行查询pid,然后通过taskkill命令杀进程. 一.查询占用端口号的进程信息 netstat -an|findstr 二.杀掉占用端 ...

  4. 436 Find Right Interval 寻找右区间

    给定一组区间,对于每一个区间 i,检查是否存在一个区间 j,它的起始点大于或等于区间 i 的终点,这可以称为 j 在 i 的“右侧”.对于任何区间,你需要存储的满足条件的区间 j 的最小索引,这意味着 ...

  5. APP统计

    APP统计就是统计用户使用app的各项指标,比如说日活跃量,页面打开次数,新增用户数量,用户年龄分布,用户地区分布,用户性别分布以及用户使用时间段等等.将统计出来的用户信息进行比对分析,可以服务公司的 ...

  6. 有关LD_LIBRARY_PATH与ld.so.conf

    我之前写过一篇关于LD_LIBRARY_PATH与gcc/g++ -L的关系的文章,于是我自己用CPACK制作了一个Debian安装包,然后我在/home/.bashrc里添加了export LD_L ...

  7. SharePoint2013升级SP1后,运行配置向导报错:未注册sharepoint服务

    SharePoint Server 2013 升级SP1后,需要重新运行配置向导,但是运行过程中报错:未注册sharepoint服务. 日志详细错误信息: 已引发类型为 Microsoft.Share ...

  8. java获取公网ip以及物理地址和代理商

    package ipconfig; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStr ...

  9. 学习笔记 第十二章 CSS3+HTML5网页排版

    第12章   CSS3+HTML5网页排版 [学习重点] 正确使用HTML5结构标签 正确使用HTML5语义元素 能够设计符合标准的网页结构 12.1  使用结构标签 在制作网页时,不仅需要使用< ...

  10. Spark学习之Spark SQL(8)

    Spark学习之Spark SQL(8) 1. Spark用来操作结构化和半结构化数据的接口--Spark SQL. 2. Spark SQL的三大功能 2.1 Spark SQL可以从各种结构化数据 ...