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1. Re: What purpose does the PPI value serve when exporting for the screen?
Lee Jay-ZyZk56 Oct 17, 2010 6:58 AM (in response to DVDmike)Nothing.
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2. Re: What purpose does the PPI value serve when exporting for the screen?
Pete Marshall Oct 17, 2010 7:18 AM (in response to DVDmike)and to the second part of your question, the sharpening depends on the resizing algorithms. The ppi would only matter if resizing by inches, (as you may be doing in the print module) where the ppi will effect the actual sizing of the image in pixels. Otherwise it has absolutely no effect on the image.
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3. Re: What purpose does the PPI value serve when exporting for the screen?
mikeobe Oct 18, 2010 12:25 PM (in response to Lee Jay-ZyZk56)I was under the impression that the Web, Email export command reduced the PPI so that it wouldn't take so long to load?
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4. Re: What purpose does the PPI value serve when exporting for the screen?
DVDmike Oct 18, 2010 12:39 PM (in response to mikeobe)When exporting for web, typically you would select how many pixels to shrink the image to. When you resize like this, it removes pixels, makes the file smaller and faster to load. It does not, by itself change the PPI, which is apparently only used for printing. According to earlier posts here, PPI is meaningless for an image destined to be displayed on screen.
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5. Re: What purpose does the PPI value serve when exporting for the screen?
hsbn Oct 18, 2010 12:40 PM (in response to mikeobe)Nope, it reduced Quality not PPI. PPI has nothing to do with file size. You can try this by export the photo at 3000PPI and 20PPI, as long as everything else is the same, the file size will be the same.
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6. Re: What purpose does the PPI value serve when exporting for the screen?
mikeobe Oct 18, 2010 1:02 PM (in response to hsbn)Hmm, so the file is just as large as the original RAW? Reduce Quality does What to the file?
Sorry, kinda sloow here!
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7. Re: What purpose does the PPI value serve when exporting for the screen?
JimHess-DIrcbP Oct 18, 2010 1:20 PM (in response to mikeobe)Using a 6 MP image as an example, it is roughly 2000 x 3000 pixels. It doesn't matter whether the PPI is set at 300, 72, 500, or what ever. The image is still the same size. The only way to make the image smaller for the Web is to reduce the number of pixels. I typically reduce them to approximately 800 x 1000 pixels. In doing that, the image is physically made smaller. Information is discarded, and consequently the quality of the image will be lower. Details can be lost. For normal viewing, the loss of detail will generally be unnoticeable, although it will be difficult to evaluate the true quality of the original image because so much of the data has been discarded.
About the only value the PPI setting has is to give you an indication of how large (in inches) the image will be at any given setting.
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8. Re: What purpose does the PPI value serve when exporting for the screen?
mikeobe Oct 18, 2010 3:40 PM (in response to JimHess-DIrcbP)Understand, that's what I thot, had to lose some of the data, pixels to get it smaller
in order to send! I probably wasn't too clear, I'm good at that!:) Just an amatuer here and trying to understanding this Photoshop thing, Most likely a Stupid Queston, I'm good at that as well!:)
Thanks,
Mike


