Re: IMPROVING DIGITAL IMAGES
- Gary proposed some interesting enhancement technique at:
The separation into the various channels is useful. Here is my take:
Bottom left is the Green channel, bottom right the Magenta channel.
Top right is a contrast enhanced image, which shows clearly the strong jpeg artifacts.
Wieland Willker, Bremen, Germany
- "Wieland Willker" <willker@...> wrote:
> Gary proposed some interesting enhancement technique at:strong jpeg artifacts.
> The separation into the various channels is useful. Here is my take:
> Bottom left is the Green channel, bottom right the Magenta channel.
> Top right is a contrast enhanced image, which shows clearly the
Wieland, you re-used the posted jpg samples, and thus the images you
worked with would contain excessive jpg artifacts. What one needs to
do is begin with an original TIFF or BMP format, then manipulate. You
probably already know this. JPG should be avoided except as a final
save for internet purposes - especailly non-grayscale separations.
Also, the RGB splits are the least useful. HSB and others (especially
YIQ) when actually split into their GRAYSCALE registered components
(used for 4 color printing) offer more data, including impressions
upon the actual parchment - which is why many rulings "magically"
appear in some grayscale splits as these lines are pressed into the
In my opinion, Photozoom Pro at:
for $129.00 is one of the best interpolators, especially its s-spline
Qimage is a powerful product with many features, as well as great
interpolation with its Pyramid-10 interpolator. It is only $50.00:
The free Image Analyzer (with the Fractal plugin) is also good,
especially when post operations (unsharp mask, and anti-aliasing) are
applied. It is found on a link on the page you named above
(zooming_in.html). ---PS the link has been fixed!---
The links are now fixed. Recall that fractal interploation adds an
infinity of pixels (with Genuine Fractals for example...) you can zoom
in forever, and NEVER see pixelations! Via the fractal algorithm more
pixels are created. New DATA is not added, just enchanced parameters.
Genuine Fractals is also a good interploation program, it can be found at:
It costs $159.00 and uses Photoshop CS and only runs on Windows 2000,
and XP. Hard to find earlier versions 2 and 2.5 run on Windows 98 SE.
Photozoom Pro does one of the best jobs, and has numerous tweaks. I
again recommend it. It runs on all 32 bit versions of Windows.
Here is another useful site which shows some tests:
Mr. Gary S. Dykes