Currently I am working on a monitoring project.It captures the activity of user by taking screenshots and saving it in a folder. Later on I am applying image processing to identify the activity of user. After extracting meaningful information, i can use a query on the images. The problem currently is I am not getting any proper algorithm which can compress the image and save my disk usage. I tried to zip the folder as well, but folders having image files cannot be compressed that much that is what i found. Any sort of advice or help will be appreciated.