There has been several threads on the forum regarding images.
Fuzziness in different stages; media library, preview, production - resolution.....
I have been curious to know a bit more about images and video- as opposed to images
displayed merely on the monitor(net)- and of course on print.
I have been googling to see if I can learn (really!) more.

Well, it's a matter of keeping your head clear to avoid confusion, I think.
There are many discussions and statements to be found on the matter.
To avoid giving a bunch of links, I'll refer some of them:

• The video world is always 72 dpi.

• 3D programs have the ability to render out imagery at higher resolutions

• Actually the video and web world doesn't have a dpi or more accurately ppi (pixels per inch because dots refer to line screens in the offset printing industry)

• Modern displays have a much higher pixel density so the number 72 is basically meaningless. IOW if an image is 720 pxels wide and you're viewing it at 100% it is no longer 10 inches wide on the computer screen, but it will still be 10 inches wide when you send it to a printer. The only time PPI means anything is when you send the image to a device that will print it.

• Now that your thoroughly confused let me throw another wrench into the gearbox. Resolution has nothing to do with PPI or DPI. High resolution images have a lot of information (pixels), low resolution images have a low number of pixels. You can set the PPI of a 100 pixel X 100 pixel jpg to 9999PPI, but it will still only contain 1000 pixels. You can set the "resolution" of a 30,000 X 30,000 pixel image to 1PPI and it will still be high resolution because it contains a bunch of pixels. Nine hundred million to be exact.

• PPI has absolutely zero effect when it comes to having specific pixel dimensions. It ONLY relates to the size of the image when printed.

• Keep this in mind: DPI is a measurement for a device, not an image. Scanners scan at the DPI (PPI) you select. Printers print at the DPI you select. Images on your computer, by themselves, do not have "DPI." DPI does not make sense for digital photos once they are in the computer. Yes, the image still has the same pixels, but where is the inch? There is no "inch" of digital data

• The only correct way to refer to the size of a photo in terms of "dots" is by describing the pixel dimensions, such as 640x480, 1024x768, etc. And here is the key: Because "DPI" makes no sense for photos on disk......there is no difference between a 1024x768 image "at 72 dpi" versus a 1024x768 image "at 300 dpi."

• If somebody tells you that a computer monitor is set to 72 DPI, tell them you're waiting for them in the 21st Century!

• One of the confusing concepts with using still images for video is understanding the DPI just doesn’t matter. It is the total pixels across by the total pixels down that is important

• It is wrong to say that DPI doesn’t matter. However, my point, which I will clarify later in this issue, is that regardless of the DPI you set for the file, video looks at the total number of pixels in the image, rather than the DPI number, to determine image size and shape. As you know, further muddying the waters is that computers assume that pixels are square, while video treats them as a never-ending variety of rectangles.

• Set the resolution to 72 pixels per inch (ppi) in the "Document size" section if the photo image will be used for video. Enter 300 ppi into the "Resolution" box if it will be used as a still image. Click "OK" once the resolution has been set.


• Video doesn't have a "DPI"... the DPI is based on what you're viewing it on. If you were looking at a 3" wide screen, then you could say that HD video is 640dpi. But if you were watching it on a six-foot-wide screen, then you could say that the exact same HD video was 27dpi.
The # of dots is fixed at 1920. So just change your output resolution to whatever you want it to be.


• One misperception we hear time and time again is about resolution. For the record, video graphics are not 72 dpi. First off, dpi stands for dots per inch (as in printing)
When dealing with video graphics, resolution doesn't matter. The same HD video file can play back on a laptop, a television, or on a digital projector, and the total number of pixels won't change. To see this clearly, stand really close to a big-screen HD TV; the picture looks soft. Now find a smaller display with an HD signal; the picture looks clearer. This is because HD is HD; the bigger the screen the larger each pixel is displayed, but again resolution doesn't change.

And - this last input is from Richard Harrington, whom I have decided to put my trust in regarding this matter. I have been in the habit of setting ppi higher.
Anyone else have input?





Just something.
https://www.petitpoisvideo.com