HDTV resolution question

Hi gang,
My HDTV can display 1080i and 720p. Technically speaking, should one be better than the other? I plan to do some head-to-head comparisons with various video and picture sources, but I was wondering if there was a well-established "preferred" mode.
Cheers!

Hey, Phil...
1080i has more lines for higher resolution and is interlaced... 720 less and progressive scan. Most don't have a choice. They usually have one or the other. If it were me, I would choose 1080i because there is more picture information. Then again, it also depends on the source format and the compression. If the data isn't there for 1080i then you will probably default over to 720.
Dual 2Gb G5, 15" G4 Powerbook Aluminum, Quad XEON Mac Pro, AppleTV, video iPod... geek. Mac OS X (10.4.9)
Dual 2Gb G5, 15" Powerbook, video iPod Mac OS X (10.4.4) RADIO STREAM: http://www.inceptdate.com:8000/listen.pls

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Your replacement came out of a warehouse not off the assembly line.
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Is an image at W 48.667 x H 32.444 inches at 72 res the same as an image that I could convert in photoshop to 300 res and then the with "Resample Image" clicked off would be W 11.68 x H 7.78 at 300 res for printing purposes? I'm asking this questions because after exporting 200 images from Lightroom 1.4, putting them into an wedding album I realized the images were not at 300 res but the first size listed above. I'm trying not to have to rebatch and have to put them back into the album. I sent the question to NAPP and got this back"
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Bob's question is a common one. And one of the first that most of us struggled to understand. Let's see if I can shed some light to help clarify the matter.
o The image starts out with a given number of pixels from the camera, scanner, or whatever was its source. The resolution only matters when it comes time to print the image.
72 dpi was once a common resolution for displaying on a computer monitor. Today 90 dpi is more common monitor resolution.
o Let's assume that the image is 3504 x 2336 pixels (which I got from his size @ 72 dpi).
o In "image size", if you do _not_ have 'resample image' checked, all you are doing is _rescaling the image. The image resolution is whatever you enter ...
For example, if you enter 360 dpi -- the native printing resolution of many Epson printers -- you get a print size of 9.733 x 6.489 inches
o Let's say you want to print this image at 360 dpi in portrait on 13 x 19 inch paper with a one inch border on the sides. That would make the short dimension of the image 11 inches and the long would work out to 16.5.
To do that you need to _resample_ the image to change the size. More pixels will be made. The resolution stays at 360 dpi. So check the 'resample image' box.
After resampling to get the print size and resolution you want, the pixel dimension goes to 5960 x 3960 (from 3504 x 2336). Those new pixels came at a price, but that is a matter for another thread and a lot of personal bias.
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P.S. The answer to your question, Bob, is yes. With resample off in PhotoShop, your original images should have gone to 11.68 x 7.787 inches @300 dpi.
In looking at the rest of your original post, it seems that the export didn't work the way that you wanted. Do I read right that the images turned out to be 11.68 x 7.787 @ 72 dpi? Can't help with that as I don't do Lightroom.

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Message was edited by: wastedyuthe

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HDTV resolution question

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