One of the most important parts of creating a cinemagraph is selecting your still image. In Cinemagraph Pro you can either select a still image from your video in-app or import one. You may want to export your still image to do some fine-tune editing or add text or a logo to your cinemagraph.
When editing your still image using a photo editing tool such as Photoshop, it's important to remember that your edits must still match your source video. Think of a cinemagraph like a still image on top of a video and when you paint a mask on the still image, it'll reveal the video underneath. That said, if the edits you've made to your still image are noticeably different than your video, you'll be able to see where the mask was applied. In the example below, I exported my still image from Cinemagraph Pro, adjusted the brightness, contrast and exposure and imported it back in the app. As you can see, the still image no longer matches the video.
Instead of making adjustments to your still image using a third-party application, try doing this in the Adjustments and/or Presets sections in the app. In Cinemagraph Pro you can select from a library of presets and adjust the color, light, tone curve and vignette of your cinemagraph. Your adjustments will be applied to both the video and still image components of your cinemagraph.
Alternatively you can make adjustments to your source video using a different editing tool before importing it into Cinemagraph Pro. You can proceed to export your still image from Cinemagraph Pro to do some fine-tune touchups at a later time.