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For a long time now, the web page for each course has had the facility to display screenshots like so.
However, few if any designers are taking advantage. Here is a step by step guide to taking screenshots and getting them added to the course page.
1. Take a screenshot (I use the PrtScr key).
2. Open Photoshop or whatever graphics program you use and paste the screenshot (in Photoshop, File - New - Image from clipboard).
3. Crop the image to 590 px wide by 442 px high.
3. Auto sharpen the image.
4. Save the image as a 'High' , Quality 60' jpeg which should keep the filesize down below 100k. Please name the files xxx_1.jpg, xxx_2.jpg etc etc.
Zip the files together and upload to LC using this page https://linkscorner.org/upload/other.php .
I hope this helps.