Software to easily create Wikivoyage banners

Question

Wikivoyage volunteers need to create banners to place at the top of each article. Thousands of banners like this one:

Here is the process for each locality in the world:

1. Example of locality: New York City
2. Click on the Wikimedia Commons link on the left
3. Filter out all images whose width is less than 2100 pixels
4. Select the greatest remaining picture
5. Select a 2100x300 area within that picture
6. Save it as a new picture
7. Upload that picture to Wikimedia Commons, with the same license as the original, and using the {{Image extracted}} template
8. Set this picture as the banner property of the article's Wikidata item

A webapp that would help with all of that would be wonderful.
At least, are there tools that can help with a few of the steps?

• The only steps where a human is needed are 4 and 5.
• At step 5, it would be great if the 2100x300 shape was enforced when selecting. Or even better, if the tool allowed a larger selection, but enforced the same ratio (banner must be 2100x300 or bigger with the same ratio)
• Extra bonus for the ability to rotate the picture before cropping
• The best is webapps, but I am OK with software for any operating system.

Answer 1

Banners can be cropped online using CropTool without editing them in an external picture editor. Another advantage is that most of the necessary file information (author, description, license) is added automatically.

• Open existing source the file in Commons
• Select CropTool from the Tools panel on the left
• (The first time, you have to authorize the tool)
• Select Aspect ratio: 7:1, press Preview
• Check the preview, select Upload as new file and type the new file name according to the above instructions
• Press Upload
• After successful upload, check the new file and add it to the appropriate category "Category:Wikivoyage banners of "