![]() ![]() We can build on the previous example by using the -resize option of the convert command: convert flower_original.jpeg -resize 64圆4 flower_64圆4.jpeg linux convert image format from png to jpg.Another typical operation is image resizing. Related searches: linux resize image photo. If -scale or -percent are specified, the resize parameter ( -resize widthx or -resize perc%) is added to the command.If the -dest parameter is provided, the destination file path is modified by replacing the directory in the source path with the destination directory.If the variable ext is defined (if -ext is given in the command argument), the extension of the destination file is changed from source_file.extension to source_file.$ext.Several tests are done within the for loop to fine-tune the conversion.Once all the parameters are parsed into the variables percent, scale, source_dir, ext, and dest_dir, a for loop iterates through each file in the source directory and the file is converted. When a case is matched, the corresponding statements are executed. The case statement is like a switch statement in the C programming language.With this, every time the shifting happens, we can access the next command argument as $1 rather than using $1, $2, $3, and so on. The shift command shifts the command arguments one position to the left. $# is a special variable that contains the number of arguments.The command line is parsed with a while loop and the case statement and values are assigned to appropriate variables.Now verify the new size which we see that the size of image is reduced to 80% of the original size. Now execute the script to resize image to 80% images] # /tmp/batch_image_resize.sh -source /images/ -percent 80% -dest /new_dir/ I will create a new directory where I will store my resized images images]# mkdir /new_dir Before calling the script below is the size of all my images images]# ls -lSh Now let us execute the batch_image_rezize.sh script to resize image based on percentage. #Description: A script for image management Either four, six, or eight parameters are valid. The script starts by checking the number of command arguments. ![]() Both the -percent and -scale parameters may not appear.-scale: This specifies the scaled width and height. ![]() -percent: This specifies the percentage of scaling.-ext: This specifies the target file format for conversions.If -dest is not specified, the destination directory will be the same as the source directory. -dest: This specifies the destination directory of the converted image files.-source: This specifies the source directory of the images.The batch_image_resize.sh script accepts these arguments: Let us jump to our shell script to resize image in a batch. Shell script to check top Memory & CPU consuming process in Linux Shell script to check successful and failed login attempts in Linux If either WIDTH or HEIGHT is missing, then whatever is missing will be automatically calculated to preserve the image aspect ratio: We can resize an image by specifying the scale percentage or the width and height of the output image. Here we are converting JPG format image to PNG. To convert image format we will use covert tool from ImageMagick. It can read and write over 200 image file formats.īefore we go to our shell script, I will show some examples related to ImageMagick #Imagemagick reduce file size software#ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files. ![]()
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