1 Correct answer
Hi @dianes98627266 go to Photoshop/File Handling and check "Enable Legacy Save As". That will address your save as issue.
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Hi @dianes98627266 double check your files - if you are using Save for Web, they convert to 72 ppi, but the pixel dimensions are the same (your w&h are almost tripled). If you go back to Image Size and convert it will be the same.
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I save projects as PSD and then quick export as JPG. Recently I noticed that my files are automatically reduced from 300pdi to 72dpi
By @dianes98627266
Just to explain what is really happening here: Export doesn't actually change to 72 ppi. What it does is to strip out the ppi metadata altogether. An exported file does not have a ppi at all; not 72, not 300, not anything. A ppi number is not relevant for screen/web/mobile, so it's removed.
The 72 figure appears when the file is reopened into Photoshop, because it needs some ppi number for other reasons. So PS assigns 72 as a default number. In Microsoft applications the default is 96, so there the file will open as 96 ppi.
Ppi is just an instruction for pixel density on paper. It is not a part of the image data. The file is just pixels, and as long as the pixels don't change, the file doesn't change.
How will I ever know the true size in inches before ordering prints online? Or if I want to change the JPG size?
By @dianes98627266
To add to D Fosse’s correct explanation, in the example of ordering prints, suppose you have an image that is 3000 x 4500 pixels, and you want to order an 8 x 10 inch print at 300 ppi, but the image ppi either isn't in the metadata or isn’t shown. Are you stuck? No, you already have the information you need. You know the image is 4500 pixels long, divide that by the 10 inches you want, and you get 450 pixels per inch. So, there are more than enough pixels in the image.
In reality you don’t even have to do the math, because in Photoshop the Image > Image Size command is also a resolution calculator. Open that 3000 x 4500 image in Photoshop, choose Image > Image Size, make sure Resample is disabled, and enter 10 inches. The Resolution value will change to 450 ppi, as if you had done the math yourself.
And as Kevin’s screen shots show, we should never look at the ppi value alone, but always consider which physical size that ppi value is for. Too many people freak out when ppi says 72 or 96 when the pixel dimensions haven’t changed, meaning all the original pixels are still there. So whether it has enough ppi is only a matter of how large you print it. A 3000 x 4500 pixel image that is 450 ppi at 10 inches wide, is also 900 ppi at 5 inches wide, and 225 ppi at 20 inches wide. So if an image says 72 ppi at 50 inches wide, that is not a problem if you want to print it at only 10 inches wide, because the same number of pixels becomes 360 ppi.
(This works differently if Resample is enabled, but that’s another discussion.)
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