Cropping a JPG image

image manipulation

This is a question about image file cropping.

I recently posted a public notice to an Indian newspaper called the Free Press Journal. This is available online as The Free Press Epaper.

Now, one can download a notice that was posted in the paper as a JPG file. However, this JPG can, and in my case, does, include multiple notices. These notices are mostly long thin rectangles running vertically, filling up the image.

I'm wondering if anyone can suggest a simple approach to "slice" the segment containing the desired notice out of the image file. I could also convert to another format if it would make this slicing process easier. A method to make the image larger if necessary would also be a plus.

Best Answer

I guess if you've never used gimp it could take you five or ten minutes to get comfortable using the "crop" tool:

GIMP

Or it might not take that long. Gimp should be available on any linux distro. There's some documentation here. You can load a .jpg, but if you want to save it that way you have to choose "Export As" from the file menu.

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Resizing and cropping images to an aspect ratio of 6×4 with width of 1024 pixels

You want all your photos to be 6x4 with a width of 1024, right? That means they should be 683 pixels high.

If that is correct, what you're looking for is ...

convert <input_image> -resize 1024x683^ -gravity center -extent 1024x683 <output_image>

... where you would replace with the filename of the image you want to resize, and with the new filename.

This will crop the edges to fit the aspect and resize them to 1024x683. It will make small images larger, as well as making large images smaller to fit your size.

When you want to resize all images in a directory, you'll need to write a quick bash script, which would look like ...

#!/bin/bash

for f in *.[jJ][pP][gG]
do
    echo $f
    convert $f  -resize 1024x683^  -gravity center  -extent 1024x683  print_$f
done

You then just make the script executable. (Say you saved the script as rename.sh, you run chmod u+x rename.sh.) Then you run the script ./rename.sh which will resize all the images in the same directory.

Convert webp to jpg error: “no decode delegate for this image format” and “missing an image filename”

Google already provided the tool to decode webp images in the libwebp package, your uploaded file works on Arch.

dwebp file.webp -o abc.png

For the encoding tool, check the cwebp command.

In Ubuntu you can install the tools with:

sudo apt install webp

On RHEL/CentOS:

 yum install libwebp libwebp-tools

And you might consider using this online tool.

Best Answer

Related Solutions

Resizing and cropping images to an aspect ratio of 6×4 with width of 1024 pixels

Convert webp to jpg error: “no decode delegate for this image format” and “missing an image filename”

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