Cless said:
The images are not blurredthey are bilinearly interpolated to make up for the fact that you're not viewing the pixels at a 1:1 ratio with the zoom (i.e. non-standard zoom on an image). It's a kind of filtering to make the images look better when you've zoomed to something weird like 142%, and it's just a display issue. I think it makes them look fantastic. Without it, images get jagged edges, whether you see them or not. I certainly do. They're not immediately visible, but look at the edge of two clearly defined objects, like a box, or a piano against a wall, anything with a good straight edge. By interpolating at non-standard zooms you get a nice sub-pixel blending that creates the illusion of a constant line better than without it. This is even more apparent in motionif the slideshow images were shown without interpolation as they zoomed and panned, they'd look HORRIBLE. The same technique is used on the Apple screensavers. Obviously you're simply not used to this.
Cless,
Your attitude is not good. "Obviously, you're simply not used to this."
I am a professional designer/photographer and a seasoned Photoshop user. I use Photoshop for my real work, and iPhoto for the rest of my everyday snapshots.
Standard interpolation techniques (e.g., bilinear interpolation) are *not* causing this issue. Indeed, it's the Quartz graphics rendering engine's filtering mechanism (which works ON TOP of iPhoto's bilinear algorithm) that is doing this. I and others have been pinging Apple about this since 4.0.0, and people whith high resolution cameras (3MP and higher) using lower resolution screens (1024x768 and smaller) who take lots of *vertical* photos will notice this the most.
Given the set of circumstances above, the more that iPhoto (and Preview) have to down-interpolate your image (as is the case with vertical photos), the more you'll notice this effect.
It's a HORRIBLE blur - completely independent of bilinear interpolation - that wasn't present in version 3.x and earlier, and has no business in version 4.
If you want to see what your photos *could* look like (that is, merely bilinearly interpolated), your best bet is to use the zoom slider - zoom in a bit and zoom back out, keeping your mouse button pressed - and you'll see things the way they were in earlier versions of iPhoto: sharp and still smooth, the same way Photoshop would present them. Of course, things look pretty good in slideshow mode as well...but I don't like browsing photos using slideshow...I like iPhoto's built-in reviewing mode.
(If you use brightness/contrast as others have suggested, iPhoto considers this a modification, and you'll now wind up with *two* copies of the photo on your machine, unnecessarily).
Anyway, this isn't something that ought to be dismissed, and I wish your attitude towards people who experience this very *real* issue would take a turn for the better. You may think you know better, but you either a) don't really care about the issue or b) haven't really seen it first-hand at its worst. I can't tell which is reality, and I'm not going to tell you that it's one or the other, but it definitely is one or the other. If it's a), then you should just stop posting about all of this. If it's b) then I don't know what to tell you. It probably shouldn't be a concern for you then...but that doesn't mean that it's not a valid concern of others.
Thanks for listening.
Drew