Autotek autocad raster design 2010 Benutzerhandbuch
remaining pixels to use all of the colors in between. This is also known as a
non-linear contrast stretch.
non-linear contrast stretch.
You can equalize a grayscale image or a color image. When you equalize a
color image, you have the option of selecting which color channel you want
to equalize. For example, if you have an image that is composed of mostly
red shades, then you can select the red channel and equalize only that channel,
spreading out the red values so there is greater contrast.
color image, you have the option of selecting which color channel you want
to equalize. For example, if you have an image that is composed of mostly
red shades, then you can select the red channel and equalize only that channel,
spreading out the red values so there is greater contrast.
Equalize Tab Options
Index
Displays the intensity of each shade on the histogram (0 to 255). For a
grayscale image, all channels have the same values. If you select the Red,
Green, or Blue channel when you are equalizing a color image, the index
number is the intensity of that color within a pixel.
grayscale image, all channels have the same values. If you select the Red,
Green, or Blue channel when you are equalizing a color image, the index
number is the intensity of that color within a pixel.
Freq
Displays the number of pixels within an image of a selected Index value.
Apply Changes To
■
Entire Image. Applies the changes to the selected image.
■
Sub-Region. Applies the changes to the sub-region only.
Sub-Region Options
(page 391)
■
Retain Current Palette. Applies your changes to the sub-region by
mapping to the closest colors from the current palette. This option
maintains the current palette and does not affect pixels outside the
selected region.
mapping to the closest colors from the current palette. This option
maintains the current palette and does not affect pixels outside the
selected region.
■
Rebuild Palette With All Colors. Creates a new palette to best
accommodate all colors in the entire image. Because this image changes
the palette, pixels inside and outside the sub-region may be affected by
this option.
accommodate all colors in the entire image. Because this image changes
the palette, pixels inside and outside the sub-region may be affected by
this option.
■
Rebuild Palette With New Colors. Also creates a new palette, but this
option guarantees that colors in the sub-region are included in the palette
by giving preference to those pixels over pixels outside the sub-region.
Because this image changes the palette, pixels outside the sub-region
may be affected by this option.
option guarantees that colors in the sub-region are included in the palette
by giving preference to those pixels over pixels outside the sub-region.
Because this image changes the palette, pixels outside the sub-region
may be affected by this option.
Equalize Tab (Histogram Dialog Box) | 319