jpegtran:tldr:a7847
The command "jpegtran -crop ${W}x${H} -outfile ${path-to-output-jpg} ${path-to-image-jpg}" is used to crop a JPEG image using the tool "jpegtran". Here's a breakdown of the command:
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"jpegtran": This is the name of the tool that will be used to perform the JPEG image cropping.
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"-crop ${W}x${H}": This option is used to specify the size of the crop area. The "${W}" and "${H}" are variables that represent the width and height of the desired cropped area, respectively. You need to replace these variables with the actual values you want for width and height. For example, if you want to crop the image to 500 pixels width and 300 pixels height, you would replace "${W}" with "500" and "${H}" with "300".
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"-outfile ${path-to-output-jpg}": This option is used to specify the output file path and name for the cropped image. The "${path-to-output-jpg}" is a variable that represents the desired path and filename for the cropped image. You need to replace this variable with the actual path and filename where you want to save the cropped image. For example, if you want to save the cropped image as "output.jpg" in the current directory, you would replace "${path-to-output-jpg}" with "output.jpg".
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"${path-to-image-jpg}": This is the path and filename of the input JPEG image that you want to crop. You need to replace "${path-to-image-jpg}" with the actual path and filename of the image you want to crop, including the ".jpg" extension.
To summarize, this command allows you to crop a JPEG image by specifying the crop size, output file path, and the input image file path. You need to replace the variables (${W}, ${H}, ${path-to-output-jpg}, ${path-to-image-jpg}) with the actual values and paths according to your requirements.