How to line-up .cr2 pixels with video pixels

I'm using a 60d. I have some video which I shot on a tripod. Without moving the camera, I also shot some raw stills. The stills are 5184 x 3456. The video is 1920 x1088 (not 1080). I'm trying to get a pixel for pixel line up between the stills and the video. Can anyone tell me how to go about this? There is a strip along the top and bottom of the still which is being discarded, but I haven't been able to determine exactly how the still is converted into video.

TIA,
Keith.

You need to match the crop ratio of the two. Very simple to do in photoshop (or any photo editor for that matter). Open the still shot, pull out the crop tool. Input 1920 for the length, then 1088 for the width/height, and crop how you like. The two should match up perfectly now.

Thanks, Ben. Unfortunately, it's not that simple. That would work if the camera were taking a direct crop from the centre of the image, based on the 16:9 ratio. But it's not doing that. It's performing some combination of cropping and resizing. I'm trying to find out exactly what it does to that 5184 x 3456 image to end up with 1920 x 1088.

keith555 wrote in post #14249182
Thanks, Ben. Unfortunately, it's not that simple. That would work if the camera were taking a direct crop from the centre of the image, based on the 16:9 ratio. But it's not doing that. It's performing some combination of cropping and resizing. I'm trying to find out exactly what it does to that 5184 x 3456 image to end up with 1920 x 1088.

Ah, I was thinking if you use the crop tool in photoshop and type in the pixel length of 1920 and the width of 1088 and draw the crop box across the screen then position it to match the frame of the video clip photoshop would both crop it and resize it to the 1920x1088 size, BUT that wouldnt be a precise overlay on pixel for pixel map of the video clip (or at least it would be a pain to try and get it to line up).

Huh, well it there any reason you cant just use a single frame from the video as the image? I believe thats how that kind of stuff is normally done when stills of something recorded are needed within video.

No, there's no real reason I can't use a single frame from the video, and that is what I've been doing in my recent projects. I have a couple of projects where I only have the still, not the video, and I'm trying to work with them, hence this thread. I can't go back and grab just any frame - the frame/still needs to be exposed differently from the rest of the footage, and in those earlier projects I created a still exposed how I needed it, but no video.

Also, it would be nice to be able to work with raw stills, just because they are more flexible. If I could just find out what sequence of changes is need to go from the raw to the video, I could make a Photoshop Action and be done with it.

I believe there is interpolation going on, so a crop/resize will not work.

the details from a RAW to a video frame will be extremely different and not overlay easily.

What software are you using? In Premiere, you would import the still, put it on the timeline in a new layer, then set the size.