>
> Mr. Sachs was so adamant on this point that I don't think he'd agree
> with your exceptions. But you have the power to prove him wrong. Can
> you demonstrate your point using Picture Window Pro... his own product?
>
Absolutely!
If I need to upsize an image (which is a normal requirement with 5MP E-1 and
A1 files), and the image contains straight lines in it, you absolutely will
get the saw-tooth pattern high-contrast edges within the image.
To break those edges up, you need to use multiple steps. But if you do the
10% resizing, things just look mushy and nasty. The resulting image will
lack the definition a single-step resizing has. So, to reduce the pattern,
here is my recommendation.
1. Resize by some odd percentage like 113%.
2. Resize by another odd percentage like 134%
3. Resize by another oddball like 121%
I used Fibonacci numbers in this example which yielded an almost doubling in
size in three steps. By doing this, the saw-tooth artifacts are nearly
eliminated or at least reduced enough to be a non-issue most of the time.
I've also experimented with image rotation (full image--no cropping) during
the steps. For example:
1. Rotate image 13 degrees CCW (anti-clockwise)
2. Resize by 113%
3. Rotate image 34 degrees CCW
4. Resize by 134%
5. Rotate image 21 degrees CCW
6. Resize by 121%
7. Rotate image 68 degrees CW
8. Trim off the white edge to your original image area.
This has given simply outstanding results. Horribly time-consuming in
Photoshop, but much faster in PWP 5.0.
Resizing is pretty much a lost art now because of higher pixel-count
sensors. Only us dinosaurs with E-1s have to go through these things.
AG
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|