Each lesson in our directory is accompanied by an image.

ProgHist can make this selection, or an author/editor can make a suggestion.

Step 1. Source an image

The image must be:

• copyright-free
• non-offensive
• an illustration (not a photograph)
• at least 200 pixels width and height

Image collections of the British Library, Internet Archive Book Images, Library of Congress Maps as well as their Photos/Prints/Drawings, or the Virtual Manuscript Library of Switzerland are useful places to search.

Step 2. Save two versions

• Save the image as a .png
• Duplicate the .png — (we need two versions)

Step 3. Version 1: original

• Name the original image so that it shares its name with the lesson file, adding the word “original”: lesson-file-name-here-original.png

Step 4. Version 2: gallery

Prepare the duplicate image for our gallery:

• Crop to a square (taking care not to remove any key features)
• Re-size to 200x200 pixels
• Convert to greyscale, adjust the contrast or tonal values if necessary
• Name the gallery image so that it shares exactly the same name as the lesson file: lesson-file-name-here.png

Step 5. Upload

• Upload Version 2 to the directory /gallery
• Upload Version 1 to the sub-directory /gallery/originals