Sigil itself never touches images or converts images. It just takes what is given. Sigil does allow you to set an external Open With editor for images and launch it. So if you have access to an image editing program such as Gimp or Photoshop or ... you can set it as the editor to use with images and open them one by one for editing in that program by right clicking.
But it mightbe better to go back to the original document and see if jpg images are available for you to use.
Last edited by KevinH; 02-24-2021 at 04:18 PM.
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