1. Preparing the image, improving the tonal range, texture, and sharpness. |
Improving the image improves your ability to define the various
objects in the image. It is at this stage of the development that
you become familiar with boarder, depth, and placement of the key
objects. Here you can also fix motion blur, graininess, and poor
boarder definition, so that the final result looks real.
The tonal range is the degree of contrast found in an image.
The greater the tonal range, the greater the difference between
the brightness pixel and the darkness pixel. The maximal tonal
range for each color (red, green, and blue) in a 24 bit per pixel,
is 256. This really does not seem like much, but a goodly number
of images that I seen require an increase in the tonal range.
Depending on your program of choice, the tonal range histogram is
usually found under the IMAGE menu. For example, PhotoShop has the
tonal control under Image-Adjust-Levels. Here
is an example of improvement of tonal-range:
Note: you must have a reasonably sized image to improve the
tonal range, and if it does not improve the image, do not do it.
To improve texture, you must try to remove graininess and
artifacts in the image while maintaining the boarder integrity.
This can be accomplished in a number of ways. The way that I
prefer to remove graininess involves masking. blurring, and
touching up.
When you start to mask, it is at this point that you begin to
define the boarders. I find that masking for improving texture, is
best done by selecting small but complete sections of each object
(complete leg, complete arm, etc.) Using the Benizer tool
(no anti-aliasing,) you can create a crisp mask so that the
blurring will not bleed over. Once the mask has been defined, you
can start the blurring process.
All halfway decent image editing programs offer a number of
blurring tools. The choices range from simple, motion, Gaussian,
to an advanced selective type. I prefer the Gaussian blur, because
is seams to have the most natural effect. The blurring can be used
in conjunction with the masking to smooth flesh, walls, and sky,
without effecting adjacent objects.
After the blurring, you may wish to touch up the object with
the air-brush, the smear tool, the clone-brush, and the burn/dodge
tool. I find that the air-brush and the smear tool are useful for
the center of the object where the color does not change much. The
burn/dodge is good for expressing depth within and around the
edges of the object. Also, you can invert the mask and apply the
clone-brush around the boarder of the object in order to crisp the
edges.
Here is an example
of improving texture.
The final step in preparing the image, is to apply the
sharpness filter. Here, I like to use the unsharpen mask, which
allows the application of sharpness to be apply to only the edges.
This enhances the edge while preventing the graininess from
reappearing.
Here is an example
of image sharpening.
The before and after images of step1. Here.
|
|
|