Confused about Pixel Count (simple question)

Question

Hi All,I am somewhat new to photo and video and have a question that may be easy for someone to answer.I typically work with videos shot with my iPhone , which I know the pixel count is 1920 by 1080, however, I recently made a video from a photo sequence entirely. The photos are 3024x4032 (standard iphone photo size), so when i first rendered the project out it was really blurry and quite massive, however, I resized the sequence to be 1440 by 1080 which is the same ratio but much less pixels. I then had to scale the images down by to about 50 percent and that seemed to work.I am really looking for some clarification as to why an image has so many more pixels than a video and also when making the sequence 1440 by 1080 is the overall quality going down now because it is so much less than the original photos which are 3024 by 4032?I appreciate help!Matt

Warren Heaton10841144 · Accepted Answer

What exactly are some established frame sizes and what is the standard bit rate for HD?

Matthew:

I initially suspected it was a bit rate issue (or some other settings issue), but I tried re-creating what you're doing with some photos I took of plants over the weekend and came across something that might be causing your loss of picture quality when you export at 100% rather than 50%.

Go to your Sequence and double-check what the Video Previews setting is for Width and Height. If it's 1440x1920, then that is the likely cause.

Here's what I did:

Take photos at 3024x4032.
Import photos in to Premiere Pro.
Select all of the photos in the Project panel and drag and drop them onto the New Item icon to create a Sequence at settings as close to the still images as possible.
Chose Sequence > Sequence Settings to check the Custom settings.
Under Sequence > Sequence Settings > Video Previews clicked "Reset" to change 1440x1920 to 3024x4032.
Add fade in at head, fade out at tail and transitions along with a push in on each image.
Chose File > Export > Media..., setting the Format to H264 and the Preset to Match Source - High Bit rate.

The rendered movie looks great as an H264 mp4 with a target bit rate of 10mbps and maximum of 12mbps at 3024x4032.

It seems with this workflow Premiere Pro automatically sets the Video Preview to half the width and half the height which would cause previews to render faster, but it commits you to either changing it later or being sure not to use the rendered Video Previews on export.

-Warren

Warren Heaton10841144 · Answer

One technical consideration, you're effectively turning your still images that have a still image aspect ratio into video. Rather than maintain the still image aspect ratio, I'd go with an established video aspect ratio at an established frame size. For example, at 1440x1080, you're using an established aspect ratio but not an established frame size (1440x1080 is actually the non-full raster size for HDV video that's presented at 16x9).

So, I'd go with 1920 x 1080 (16x9) or 1080 x 1080 (1x1). Of course, this means repositioning each still image to best fit the chosen aspect ratio or at least scaling to fit the width while cropping the top and bottom. Your stiles are close enough to 3840 x 2160 that you could opt for that instead of 1920 x 1080.

Sign up

To post, reply, or follow discussions, please sign in with your Adobe ID.

Sign in to Adobe Community

To post, reply, or follow discussions, please sign in with your Adobe ID.

Scanning file for viruses.

This file cannot be downloaded