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Photoshop Question
Old 05-02-2007, 09:26 AM   #1 (permalink)
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All,

I recently upgraded my version of Photoshop from 5 to 8 and so far I like it but I haven't used it a lot so far and like most things there is a learning curve with the new product.

I have always been told and believed that the majority of digital cameras take their images at 72 dpi and yet last night when I was working with and displaying some of my images in the new Photoshop I noticed some of my dimensions were off and when I went to do an Image - ReSize I noticed that Photoshop is telling me that my images are at 180 dpi and I am confused.

I went into my photo archives and pulled up a couple of photos I had taken a few years ago with a Nikon D100 whihc I was pretty sure were 72 DPI images and they are now being reported by Photoshop 8 as 180 DPI images so what gives here?

Does the newer Photoshop's report a DPI of 180 by default or did I inadvertantly change a setting? Photoshop 8 has a few new ways of doing the same stuff I have always done and I am still getting used to it.

How can I reset my DPI to 72? I liked it that way and I want to get back to it. Thanks for the help.
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Re: Photoshop Question
Old 05-02-2007, 12:06 PM   #2 (permalink)
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There have been many threads on this subject. You can just search for the phrase "dots per inch" and find many of them. But here is a link to a post by RG that goes into some detail:

http://www.glamour1.com/forums/tech-...nch#post237468

The bottom line is that the camera takes a photo using its built in resolution or a resolution that you set it to. For example, a camera may take the photo at 3000x2000 pixels. What is the DPI. Well there isn't any! At that point we don't know what the final use of the photo will be so you can't specify DPI meaningfully. So the camera maker just sticks into the "m e t a" data of the photo some arbitrary value like 240 dpi, or 216 dpi, or whatever. Then your Photo editing program may arbitrarily set it to some other value. But you can change the value whenever you want. The photo doesn't change at all when you change the dpi setting.
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Re: Photoshop Question
Old 05-02-2007, 12:21 PM   #3 (permalink)
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Here's some screen shots to illustrate the dpi question:





Notice DPI change. Notice Pixels are the same. Only Inches info changed.

Cheers,
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Re: Photoshop Question
Old 05-02-2007, 02:22 PM   #4 (permalink)
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When you make a crop (using the crop tool in Photoshop) set your proportions, like 5x7 or 8x10 and then delete the dpi shown at the top of the page. By leaving it blank you will be working with the native resolution and you can then set the image size/change after you have done whatever it is you want to do with your image.

Jon
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Re: Photoshop Question
Old 05-02-2007, 03:37 PM   #5 (permalink)
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Ahem! Gentlemen -

DPI (Dots Per Inch) = Printer
PPI (Pixels Per Inch) = Monitor

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Last edited by DocSmith; 05-02-2007 at 03:38 PM.. Reason: Omitted left parenthesis
 
Re: Photoshop Question
Old 05-02-2007, 08:52 PM   #6 (permalink)
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All this is well and good but can someone please tell me how I can set the DPI value in Image - ReSize back to 72? If I can't figure it out my only other option is to delete Photoshop 8 from my computer and go back to Photoshop 5 which I actually prefer. Thanks again.
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Re: Photoshop Question
Old 05-02-2007, 10:13 PM   #7 (permalink)
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Quote:
Originally Posted by PhotoDave1 View Post
All this is well and good but can someone please tell me how I can set the DPI value in Image - ReSize back to 72? If I can't figure it out my only other option is to delete Photoshop 8 from my computer and go back to Photoshop 5 which I actually prefer. Thanks again.
Well that's too bad as you'll miss out on literally hundreds of features that have been added since Photoshop 5 that are particularly important to Digital photographers.

Keep in mind that the 72 doesn't affect what you do in anyway. Nothing has changed. The image you load into Photoshop is the same image. You can just ignore the 72 for all practical purposes for most of your workflow. Virtually all Digital SLRs of the last few years from Nikon and Canon and other major manufacturers are indicating a value greater than 72. So if Photoshop 5 reports it as 72, then there is some problem with Photoshop 5.

However, all that being said, you could probably hire someone to write you a script that would automatically change the value to 72 and then you attach that script to the On Load event of Photoshop 8.

Cheers,
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Old 05-02-2007, 10:18 PM
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Re: Photoshop Question
Old 05-02-2007, 10:51 PM   #8 (permalink)
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Quote:
Originally Posted by PhotoDave1 View Post
All this is well and good but can someone please tell me how I can set the DPI value in Image - ReSize back to 72? If I can't figure it out my only other option is to delete Photoshop 8 from my computer and go back to Photoshop 5 which I actually prefer. Thanks again.
Older versions of Photoshop for Windows opened some image file types at 72ppi by default, regardless of the actual image resolution. This was more of a bug than anything else. If PS couldn't detect the resolution of the file, it defaulted to 72ppi. PS5, PS6 and PS7 did away with most of these bugs.

There's no reason to convert them. The files haven't changed. Photoshop isn't choosing a new resolution, it's opening them at the actual saved resolution.
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Re: Photoshop Question
Old 05-03-2007, 01:46 AM   #9 (permalink)
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Quote:
Originally Posted by R_Fredrick_Smith View Post
However, all that being said, you could probably hire someone to write you a script that would automatically change the value to 72 and then you attach that script to the On Load event of Photoshop 8.
This is really all a matter of 'what one gets used to'...he's used to seeing 72dpi in the image size and so your suggestion is a good one. Of course all he has to do otherwise is go into the image size and change that value himself. But a script would make this seamless without his intervention.

I want to throw another wrench into the works...dot pitch.

I come from a CAD background and before LCD monitors came into existence one would want to get the smallest dot pitch possible on your CRT so that your lines would be smooth and not choppy.

I wonder if (1) CRTs are still the best way to go for photo editing and (2) if dot pitch is still a concern? I would think that the answer in both cases is still "yes". LCD monitors, as far as I know, do not have variations in dot pitches (unless there's been developments in smaller diodes packed closer together?) and are actually spaced further apart than CRT 'pixels'.

Comments on this?

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Re: Photoshop Question
Old 05-03-2007, 02:00 AM   #10 (permalink)
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Quote:
Originally Posted by R_Fredrick_Smith View Post
Here's some screen shots to illustrate the dpi question:

...images removed for space consideration...

Notice DPI change. Notice Pixels are the same. Only Inches info changed.
Hmmm, interesting thing...there's degradation in the first image compared to the second one.

I'm running with Explorer 7 and in the lower right corner of the window you should see a magnifying glass probably showing '100%'. If you click on the small black triangle to the right of the percentage you should get a pull down screen with various percentages. Change it to 400% and everything on your screen with increase in size. With the screen now set to 400% scroll up to your 2 images and do a scrolling back and forth between the 2. Although the 2 images may have the same pixel dimensions you will note that the 72dpi image is smoother than the one set at 300dpi. I can only take that to mean that there is a loss in quality. So there is some relevance to sizing your image to 72dpi when presenting on the monitor.

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