As mentioned in our previous
photo software newsletters and especially the March
2005 newsletter on image resolution, images
are most commonly referred to as either high resolution or
High resolution images are those intended to be printed and
usually have 300 dots per inch (DPI) or more. Low
resolution refers to images created primarily for
screen display and usually have 100 DPI or less.
||Imagener will give different results depending on the
resolution of the beginning image. Many of our customers
use the Kneson Unlimited Resample Method for all images,
but this can be shortsighted.
The Kneson Unlimited Resample Method is extremely powerful.
It puts images through three major processes:
- Converts the image from raster to vector format
- Performs a sophisticated and intense stretching operation
on the vectorized result
- Conversion back to raster format
This intense operation is somewhat overwhelming for many
smaller and/or lower quality images. Think of it as cutting
down a single blade of grass with a chainsaw - the Kneson
Unlimited Resample Method is simply too powerful. You
may be able to obtain better results using one of the other
methods. Further, think of multiple ways to drive home
from work. On any given day (for each specific image) there
is a better way to get there (other Resample Methods will
All Resample Methods are
sophisticated in the operation they perform, and all represent
programmatic superiority to the methods for enlargement
in expensive photo software packages like Photoshop® or
Paint Shop Pro®. Notice in the partial screenshot above
that there are three other Resample Methods, Normal, Bilinear
and Bicubic. These three methods are the only methods used
in expensive commercial photo software packages.
Also, do not think of the Kneson Progressive++ method
as "the next best" in the list. All Resample
Methods are algorithmically different and manipulate images
own unique ways. You will achieve the best results by comparing
multiple results for each image.