The image in the gallery will be the preview image used for ArtRage's gallery. It should not be out of focus, can you tell me what version of the app you are using (Help > Settings) and on what device?

Can you tell me what image type (PNG or JPG) the out of focus images are? Is there any pattern that you can spot? (Do the out of focus ones appear after saving a new painting, after exporting, after viewing the image in the ArtRage gallery?)