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PrintDriver is a large format digital print dude. His advice/opinions may not apply to the 4color/offset/web world of printing

Hi Flossy, I'm Bob and I am new to this forum so I just now read your post:
"Whenever I open a TIFF file in Photoshop CS it tells me "Pixel aspect ratio correction is for preview purposes only. Turn it off for maximum image quality." If I continue it opens the file, but the image is elongated badly. Whenever I consult the Help files it doesn't offer any practical advice. Does anyoe have any ideas how I can turn it off? These images open fine in other software packages."
What you have run into is the Square Pixel Dispaly vs the Rectangular Pixel Display.
Here's how it works:
Pixel aspect ratio specifies the ratio of width to height of one pixel in an image. Frame aspect ratio describes the ratio of width to height in the frame dimensions of an image. For example, D1 NTSC has a pixel aspect ratio of 0.9 (or 0.9 width by 1.0 height). It also has a frame aspect ratio of 4:3 (or 4.0 width by 3.0 height).
Some video formats output the same frame aspect ratio but use a different pixel aspect ratio. (SEE FIGURE 1 attachment)For example, some NTSC digitizers produce a 4:3 frame aspect ratio, with square pixels (1.0 pixel aspect ratio), and a resolution of 640 x 480. D1 NTSC produces the same 4:3 frame aspect ratio but uses rectangular pixels (0.9 pixel aspect ratio) and a resolution of 720 x 486. D1 pixels, which are always rectangular, are vertically oriented in systems producing NTSC video and horizontally oriented in systems producing PAL video.
If you display rectangular pixels on a square-pixel monitor without alteration, images and appear distorted; for example, circles distort into ovals. However, when displayed on a broadcast monitor, the images are correct. (See attached image.)

That's a really nice pile of information but it doesn't tell how to fix the prob.
Photoshop CS is somehow opening files at the wrong aspect ratio. Why, is a mystery - unless the source of the image is also using CS and has for some unknow reason selected something other than Square on the New File dialog box under the Advanced section. Hard to make that kind of mistake.

PrintDriver is a large format digital print dude. His advice/opinions may not apply to the 4color/offset/web world of printing

OK, navigate to c:\Documents and Settings\your name\Application Data\Adobe\Photoshop\8.0\Adobe Photoshop CS Settings
and delete Adobe Photoshop CS Prefs.psp. This will cause CS to re-create the prefs and you can then choose NOT to
'Pixel aspect ratio correction is for preview purposes only. Turn it off for maximum image quality.' turn it off and you should be able to see the graphic in it's correct aspect ratio. If this doesn't work, contact Adobe support or search their kowledge base for a solution.
Also you cold always re-scale the horizontal size to approximate the correct aspect.
Good luck.

It might be easier toturn it off in the view menu.

To fix the problem.

I was experiencing a similar problem.

Permanent fix.

I fixed the problem by selecting the following command from the menu.

Image>Pixel Aspect Ratio>Square

After putting a check next to "Square" save the file.

You will no longer get a "Pixel Aspect Ratio Correction"

This is a permanent fix.

Temporary fix.

You can get Photoshop to display the image correctly by turning off "Pixel Aspect Ratio Correction"

View>Pixel Aspect Ratio Correction

This will uncheck "Pixel Aspect Ratio Correction" but it only changes the way the image is displayed. Saving the file and reopening it you will once again get a "Pixel Aspect Ratio Correction"

Even if you make a change to the image you will get a "Pixel Aspect Ratio Correction" until you change the "Pixel Aspect Ratio".

Hallelujah thread resurrection!

I believe! Thanks, PS_user.

first post here....and i have to use it to say...LOL thats a classic!!!! hahaha zup dawg....haha

Hm I feel a little bit stupid, but I just couldn`t find the "pixel aspect ratio" on images I can only turn it off in the view. Is it somewhere else in CS4????

Thanks!

They've moved the Pixel Aspect Ratio command to the View menu. (I guess that makes more sense, if you think about it). But don't feel stupid. It's the same thing that used to be under the Image menu.

I had the same problem with the Pixel Aspect Ratio when I brought my graphic into Final Cut Pro.... it was because the PAR was NOT set to Square Pixels.

As it turned out, because Photoshop was auto-correcting the the Pixel Aspect Ratio of my session, I had no idea that my graphics would be stretched out.

For future reference, start every Photoshop session where you will be importing .PSD files into Final Cut with the correct session aspect ratio and the square pixels for the pixel aspect ratio.

It has risen.