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I would like to inform you that the color of the uploaded file is not being modified or compressed when uploaded to jotform. The image should be seen as is. Please note that how an image is seen on the page will still depend on the browser and monitor that is being used, and also the color profile of the image. If you use editing programs such as GIMP or Photoshop, you can check out this guide on how to resolve this issue: My Photos Look Different on the Internet! How Can I Fix Them?
Below is a screenshot of how the image is displayed in my Google Chrome browser as compared to the images from your screenshot:
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