Does iPhoto alter images when importing from camera ?(+ tip for slideshow)

Question

I came across the following article:
http://www.andrewburke.orconhosting.net.nz/mac/builtin.htm#photo
The claim here is that during import iPhoto alters images in some way. The iPhoto experts, Terence OldToad, LarryHN and others, could you please comment, what's your opinions on this ?
Resize Images for iPhoto Slideshows
If you are running a slideshow in either Preview or iPhoto, you want the image being shown to be exactly sized to your screen. Images from almost all modern cameras are much larger in pixel dimensions than your Mac's display, so they will be interpolated down to fit. When they are resized on the fly through interpolation they never look as crisp or pristine.
When I import images from my Nikon to the Mac, I keep them outside of iPhoto and at their original size, as an archive from which I might eventually produce some prints. From there I choose the best examples that I want to display onscreen and copy those out of the archive for processing. Each one of those favorites that I've chosen is then tweaked in an image editor (I use Gimp Shop) and the final step before sharpening is to resize it down to match the dimensions of my display.
My iMac is 1440 by 900, so if an image is narrower than that ratio I scale it so the height is exactly 900; if it's wider I scale it so the width is exactly 1440. After these tweaked and resized images are finished I import only those into iPhoto. Then when I run a slideshow they are displayed exactly at their original size (not stretched or shrunk to fit the screen) and the difference is stunning.

Answer 1

What he says is +"you want the image being shown to be exactly sized to your screen. Images from almost all modern cameras are much larger in pixel dimensions than your Mac's display, so they will be interpolated down to fit. When they are resized on the fly through interpolation they never look as crisp or pristine."+
The title of the piece is +"Resize Images for iPhoto Slideshows".+ He is talking about you resizing photos before you import so they will match the screen size during the display of a slide show on the screen - not iPhoto changing anything during the import of the photo but during the display of it - This is a bit like the cropping during printing questions - if you want to control exactly have is being shown (or printed) rather than use a generalized scheme to make photos fit a non native size then you much do the changes yourself
I'm sure that he is correct but since I use iPhoto as a photo library manager which lets me show quick and easy slideshows, I have no problem - *my original, unaltered photos are there in iPhoto* and available for use as I see fit - the degree of modification that takes place in the display of a slideshow has never even been noticeable to me - but then I do not see iPhoto as a single purpose slide show viewer - in fact that is a very minor feature for me
LN
Message was edited by: LarryHN