Pixels vs DPI - the slideshows question
I understand why dpi is important when printing pictures, but I am told this is a non factor when creating a slideshows. I am told for a slideshows only the ratio aspect matters and total pixels: 1024x768 and a 4:3 ratio...why does dpi not matter ? Isn't this the same thing where a certain amount of pixels are available for display
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ASKER
Heres what the slideshow company said..does the 4:3 ratio still not make sense based on the below...
We recommend that you pre-crop your images to a 4:3 or 3:4 (landscape or portrait) ratio. If you get the images to be exactly 1024x768 pixels, that's probably your best bet, since all images get re-sized as such when re-rendered at DVD-Quality. Anything less in resolution won't look as good and might get cropped.
If you're wondering what DPI you should use, keep in mind that DPI is only for print, so 1024x768 pixels is enough information. (For instance, a 1024x768 image at 300 dpi prints at roughly 3.5x2.5 inches, and at 100dpi prints at roughly 10x7.5 inches, but the screen ignores all that and just cares about the pixel resolution, the 1024x768 number.)
We recommend that you pre-crop your images to a 4:3 or 3:4 (landscape or portrait) ratio. If you get the images to be exactly 1024x768 pixels, that's probably your best bet, since all images get re-sized as such when re-rendered at DVD-Quality. Anything less in resolution won't look as good and might get cropped.
If you're wondering what DPI you should use, keep in mind that DPI is only for print, so 1024x768 pixels is enough information. (For instance, a 1024x768 image at 300 dpi prints at roughly 3.5x2.5 inches, and at 100dpi prints at roughly 10x7.5 inches, but the screen ignores all that and just cares about the pixel resolution, the 1024x768 number.)
What they are saying is, all images received will be re-sized to a 4:3 aspect ratio. If you submit an image that is some other ratio, it will get cropped . The only way to keep the entire image intact without cropping is by adding black bars to the sides or top and bottom to get it back to 4:3. They are not going to do that. If these images are only going to be viewed on a computer monitor, resample and pre-crop them to 1024 x 728 (or 728 x 1024) and 96 dpi. If you have images that you cannot crop without ruining them, add the black bars yourself so that the image you submit is 1024 x 768 including the bars. In this case it's not a matter of whether 4:3 makes sense, 4:3 is all the slideshow company can deal with.
ASKER
Makes a lot of sense...thanks for the tutorial
dpi from scanner to computer
dbi from computer to printer
so it's about how is the quality you want to make on this picture