And your project is set to an 8K template.  What settings are you using to export the video?  8K, 4K, HD, or some other resolution?  And what is the size and resolution of the device upon which you are viewing the photos?  It is likely that you are changing the resolution of the photos at every step of your workflow and possibly losing some picture quality.  On the other hand, if you are viewing the image too closely on a high resolution screen, you may be seeing imperfections that are hidden on a lower resolution device.

What are the project settings?

Harry, when you respond to a post on this forum via email, no photo can be attached.  Please make your post on the forum website where you can attach the photos.

And when you say the photos are grainy, where in the workflow are you seeing this?  Have you rendered the file on the Premiere timeline?  And are you still seeing the graininess after you export the video to a file?

Hello,

Can you please share the process of video creation? Which application are you using?

Also, what are the dimensions of the two images and the video?

Regards,

Medha