On Nov 3, 2017, at 10:34 AM, Curtis Nichols <AE-List@media-motion.tv> wrote:

PPI: pixels per inch.  

An inch of what?  An inch on a 60" screen? An inch on an iPad? An inch on a 40' projection screen?  For HD, all of those are 1920 pixels across. If you put a ruler to them you'll get a different ppi in each screen. That'd be a silly thing to do, but it illustrates the point. 

Video is measured in pixels, not inches. 

And BTW, ignore the "video is 72 dpi" claim. Again, an inch of what?

On Fri, Nov 3, 2017 at 10:18 AM Rick Gerard <AE-List@media-motion.tv> wrote:

No - you can’t blow up a 300 ppi image 4 times without loosing quality in video or the web. 

The samples I showed you are exactly the same number of pixels. The PPI only effects the size of the printed image on paper. They will both look exactly the same on the web, embedded in an email, or in a video. 

PPI is completely irrelevant unless you are printing. That is what controls the size of the printed image. 

If you are scanning a document then increasing the PPI will give you more pixels per inch of document, but if the image originally is 100 pixels by 100 pixels then the resolution is 10,000 pixels. PPI has nothing at all to do with resolution in a digital image. 

PPI has everything to do with resolution when you are talking about scanning or the size of an image sensor. When you are talking about a digital display you don’t use PPI, you use dot pitch - how many dots are there per inch.

I hope this helps. When working with images in Photoshop or even creating vector artwork in Illustrator you should only be looking at the number of pixels. The only time you need to pay attention to PPI is when you intend to print that image on paper.

Hope this clears it up for you.

On Nov 3, 2017, at 8:02 AM, Peter Matulavich <AE-List@media-motion.tv> wrote:

Thanks Rick,  it worked and how easy!  While you don't need to worry about PPI in the settings, it's good to know how many PPI were in the original image so you know how much you can blow it up before losing quality, right?  In other words, a 300 ppi image can be blown up a little more than 4 times.  I don't often work with imagery that was originally 300 ppi, so this really opens some doors when I do.

Thanks again.

Pete

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If you goal is to resize the images so they are at least 1920 X 1080 then do that by resampling the image Alt/Option + Ctrl/Cmnd + i, then turn resample on and set the dimensions to pixels and enter 1920 or 1080 in the smallest box. You don’t need to worry about the PPI unless you plan to print the image.

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Curtis Nichols

www.PCSProductions.com
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