Google| Subject | Re: Lenses and sharpening |
| From | Floyd L. Davidson |
| Date | 09/20/2014 06:16 (09/19/2014 20:16) |
| Message-ID | <87fvfnrkoh.fld@barrow.com> |
| Client | |
| Newsgroups | rec.photo.digital |
| Follows | nospam |
| Followups | nospam (27m) |
nospam <nospam@nospam.invalid>wrote:
nospamThat is not what was being talked about. The suggestion was that an image file is "opened" at some set PPI. It isn't.
In article <87oaubrsi2.fld@barrow.com>, Floyd L. Davidson <floyd@apaflo.com>wrote:Floyd L. Davidsonnospam
When loaded into an editor the image data *will* be exactly the same regardless of what the PPI tag is set to.
The data is not changed in the editor, but it is changed in the device driver for either a printer or a monitor. The PPI used is not that of the Exif tag, it is the PPI that the device works at.
the tag doesn't change the pixels but some software looks at the tag. very simple concept.
But the editor is not where that is adjusted for. It is exactly as I stated, a function of the device driver.nospamIn article <87vbojttf4.fld@barrow.com>, Floyd L. Davidson <floyd@apaflo.com>wrote:Floyd L. DavidsonFloyd L. Davidson
Until you print... or display an image on a monitor screen. Same thing, and a different value for DPI/PPI.Each and every monitor operates at a given PPI. So does each and every printer.nospam
correct, however display ppi is no longer relevant since modern operating systems no longer map it 1:1.
I'm not sure what nonsense you mean by that.
it means what it says, pixels in an image are no longer mapped 1:1 to pixels in a display because otherwise everything would be very tiny on a hi dpi display.
That is a really idiotic statement. Not just wrong, just plane dumb.Floyd L. Davidsonnospam
The monitor uses a specific PPI. The data sent to it *is* displayed at the PPI. If it isn't mapped at 1:1, you get a really odd looking screen!
completely wrong on modern graphics systems.
To respond to a statement about the printer... which isn't telling us anything at all.nospamFloyd L. DavidsonFloyd L. Davidsonnospam
The tag in the image file,
1) has no effect at all on the monitor, and
correct.Floyd L. Davidsonnospam
2) has no effect at all on the printer, and
depends on software used to print.
Incorrect. The printer can only print at 1 set PPI value.
i'm talking about the software, not the printer.
At least this time you are responding to the comment rather than to something only in your head.nospamFloyd L. DavidsonFloyd L. Davidsonnospam
3) has no effect at all on the editor, and
depends on software used to edit.
No, the data is not changed as it is loaded. You can edit it, and you can resample it. But that is not caused by the PPI tag.
again, i'm talking about the software, which in some cases will look at the tag and scale it. not all will do that but some does.
An editor can scale an image depending on the PPI tag, of course. Nobody has said it can't. The point is that it won't do it automatically just because you opened the image file. It has nothing to do with editing the image or with viewing the image. It is only done when the user manually tells the program to rescale the image to match the PPI tag.
You did above. It's right there, quoted for you.nospamFloyd L. DavidsonFloyd L. Davidsonnospam
4) has no effect at all on the image.
correct.
So why claim that it does?
i didn't claim it did.
So?Floyd L. Davidsonnospam
Or are you claiming the monitor or the printer will change to match the data??? Absurb.
absurb??
that's like the 3rd or 4th time you've confused b with d.
Only in your mind.nospamFloyd L. DavidsonnospamFloyd L. DavidsonFloyd L. Davidsonnospam
Because chaning the PPI tage in the image file does nothing.
it does when printing, which is what i said.
It doesn't do a thing.
it does.
It can't.
it does.
Don't make up stories.nospamFloyd L. DavidsonFloyd L. Davidsonnospam
Set the Exif tag to 72, 360, 720, or 7200 and then tell the print driver to make an 8x10 print. It will, but it will run at it's own PPI rate, not the one set in the Exif tag.
setting the image ppi to 7200 results in a print that's 1/10th as big as if it was 72. or to put it another way, printing at 1/10th the size sets the ppi 100x higher than it was before.
It does not such thing. Try it and find out.
i have, on many occasions.
when you are able to run the software other people run and have done so, get back to us.I have done so, I don't do so. There is no need.
Virtually all editors use the PPI tag in the same way, though granted the software you use tends to make an attempt at confusing people, and has succeeded in your case.
Seems to be what you are doing.nospamonce again, you aren't using the software other people are using, yet you tell them how it works. that's really fucked up.Floyd L. Davidson
You don't even know what the software you are using is doing.
yes i do, and *far* better than you do, who has never used it at all.
you're talking out your butt.
Whatever, this is just another silly sidetracked thread where you inject as much confusion and stupidity as possible. Unless you can convince me you want a reasonable discussion, I'll not bother with more on this.
-- Floyd L. Davidson http://www.apaflo.com/ Ukpeagvik (Barrow, Alaska) floyd@apaflo.com
09/13/2014-
