I have had this issue for a long time. If I try to add a still image like a PNG to a video, not only will the image itself lose focus, but the video somehow becomes compromised and blurrier. This was a serious issue in my video where I had captured frames, made them grayscale and added captions, because they are immediately compared to adjoining video, so the video gets suddenly blurry and then goes back to sharpness when motion resumes.
But even then the video itself isn't as clear when pictures are on the timeline. I have also had abundant issues with audio pops when using images. Here is an example of a title I made in Gimp along with a lossless copy of it in a video. At first glance, it's the same. But check the contrast of the text, and the detail on the texture of the green thing. Look around the rim of the green eye and the base of the tentacles.
Oh, just so you know, the image is the same size as the video, custom made for it. That is 512x384.
Is there anything I can do about this besides trying to sharpen everything, since I know it won't render right? It looks sharp in the editor.
I have even tried converting these PNGs to little video clips. Same thing, it lowers the quality of the image.
Help!