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Below is a list of the Color menu items. Click on the
different items for a detailed description.
Brightness
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Clicking this or pressing (Shift+B) will add the percentage
adjustment to the red, green and blue components of each
pixel. A lower percentage makes the image darker and a
higher percentage makes the image brighter. Before
Image
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Clicking this or pressing (Shift+Ins) will expand or decrease
the brightness range by the percentage specified. Before
Image
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Clicking this automatically expands or decreases the brightness range
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Clicking this adjusts the intensity of colors in the bitmap by
changing the gamma constant that is used to map the intensity
values. Intensity values ideally follow a logarithmic
progression, because the eye perceives changes in intensity as being
equal when the ratio of change is equal. For example, we would see a
change from 0.1 to 0.2 as being equal to a change from 0.2 to
0.4. Gamma is a standard constant that is used to
calculate the progression. For most CRTs the gamma constant is in the
range of 2.2 to 2.5.
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Clicking this increases or decreases the intensity of the image using
the gamma by raising or lowering the brightness
midpoint. Gamma values greater than 1.0 produce a brighter
image. Gamma values less than 1.0 produce a darker image.
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Clicking this changes the hue of colors in the bitmap by rotating the
color wheel. This method can rotate the color wheel in
either direction. A 180-degree rotation in either direction changes
each color to its complement. Positive rotation takes red toward
green, green toward blue, and blue toward red. Negative rotation has
the opposite effect.
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Clicking this will display a window where you can increase or
decrease the saturation of colors in the selected
image. Positive values increase and negative values
decrease the saturation of colors. The saturation level is
increased or decreased by a percentage of its present saturation
level. The saturation was increased in the image below.
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Clicking this or pressing (Shift+Pause) will increase the contrast in an bitmap by centering, maximizing, and proportioning the range of intensity values. Unlike the Contrast method, this method always retains the original number of different intensity values. (Ordinary contrast adjustments can lose values at the high and low ends of the scale.) |
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Clicking this filters the image to detect colors in a given intensity
range Intensity levels range from 0 to 255 for each color
plane (red, green, and blue) This feature processes each
plane separately. If a value falls within the range, it is
raised to 255, and if it falls outside the range, it is lowered to 0.
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Clicking this or pressing (Shift+Y) will change a color image
to a grayscale image. Each color will be changed to a
matching shade of gray. Below shows a 256 color image and
the same image converted to grayscale.
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Clicking this or pressing (Shift+Tab) will convert the hues
and saturation of the currently displayed image to make it look like
an old photograph (before color film).
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Clicking this inverts the colors in the bitmap, making it like a
photographic negative.
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Clicking this converts a 1-, 4-, 8-, 16-, 24-, or 32-bit bitmap to a
ha;f-toned bitmap. A half-toned bitmap is a 1-bit bitmap that has
been dithered for black and white printing or display. If
the bitmap is originally 1-bit but is not black and white, this
method changes it to black and white.
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Clicking this or pressing (Shift+Home) will change the color resolution of you image according to the settings you choose. MORE |
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Clicking this or pressing (Shift+PgUp) will increase or
decrease the contrast of the image in a bitmap, using a histogram to
determine the median brightness. This method finds the
median brightness of the image; then brightens the pixels with values
above the median and darkens the pixels with values below the median.
This is more sophisticated (but slower) than the Contrast method,
which uses the middle possible value (128) rather than finding the
actual median.
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Clicking this or pressing (Shift+PgDn) will linearize the number of pixels per gray level in the bitmap. This can be used to bring out the detail in dark areas of an image. |
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Clicking this or pressing (Ctrl+F) will fill the bitmap with
the specified color. If you just want to fill a certain
part be sure to select it before applying Fill. Before
Image
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Clicking this or pressing (Ctrl+I) will shift the red, green, and/or blue channels up, down, left or right. Shifting the channels can produce different effects depending on the images, the colors chosen, and the amount of shift. Below is a before and after image that will give you a better idea of what this option will do.
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Clicking this filter enhances the edge/line relationship of images.
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Clicking this or pressing (Alt+Clear) will display a window in which you can choose a different color palette to apply to an image. There is also a palette viewer/editor included. MORE |
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Clicking this or pressing (Alt+Ins) will prompt you to choose the color in the image you want to replace and select the color you want it replaced with; it will then replace every instance of that color in the entire image with the new one. |
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Clicking this or pressing (Ctrl+P) will replace the current image with an image created from images contained in the specified directory. MORE |
