Pixel dimensions and resolution

When designing for an iphone4 we set up the canvas to 640x960 pix, but we discussed if we should define the resolution to 326ppi, as described in the iphone tech spec.
When the pixeldimensions are defined - why does a pixelbased program like Fireworks ask for resolution? I should think that only non-pixel based output wanted definition of dimensions and resolution.
Can you help?
Nina Storm

Yes. Go ahead with the reccomendations for PPI for iphone. Dimensions are merely the height and width of the image. Those are independant of resolution. Fireworks default resolution is 72 PPI. Since PPI doesn't affect the exported file size, it doesn't matter, at least for web pages displayed in a browser, if you use 72 PPI or 500.

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  • Is there any way to batch change resolution, but not pixel dimensions?

    I was changing the resolution of my digital photos from 180 to 300 ppi individually as I edited them, but sometimes I would forget. Since I need the higher resolution for printing, I decided to automate that step by using PSE's "Process Multiple Files" feature. I noted that the Resolution selection was grayed out until I checkmarked "Resize Images." Since I didn't want to change the number of pixels, I left those fields blank.
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    Thanks for your input, and you may be right, but I'm not sure. I'm still trying to figure this out. I know it's the same photo on my monitor, but I keep reading that print resolution (ppi) is different from pixel resolution (i.e. 2000x3000.) This is my situation-- I'm sending the photos to a publisher for printing in a book. The publisher did not specify a size in inches--in fact I think the photos will be different sizes when printed on the page. They told me to send the photos in at 1600x1200 pixels. I've heard that 300 ppi is the standard resolution for publishing, so to get decent quality printing of my photos I thought I should increase the resolution from 180 to 300. But thinking about the different sizes, it seems that the resolution (ppi) will change depending on the size the photo is actually printed. At 300 ppi, a 1600x1200 photo will be printed at size 5.333" X 4". If a photo is printed full bleed on the cover of the book that is 8" x 10.667", then it will be 150 ppi. So, I guess you are right that I don't need to worry about the ppi resolution for the book photos.
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  • Would a photo with 70MB in pixel dimensions but low resolution print clearly?

    Hi there,
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    I really woudl appreciate your help in telling me if my photo will print clearely choosing the belwo document size.
    Many thanks!

    This is the easiest way for you to get an acurate idea of what your image will look like printed...
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