On Sunday 12 January 2003 5:01 pm, The Purple Tiger wrote:
On Sunday 12 January 2003 11:10 am, Constant Brouerius van Nidek wrote:
In Gimp and on my Xawtv I find a possibility to play with the hue. I have not found any change in the pictures after changing the hue. Could somebody explain in plain english ;-) what hue is and what to expect?
Hokay, I don't know what you do and do not know, and I also know that I tend to mess up a lot when I try to explain things, so here goes:
If you imagine a colourwheel [A circle that goes Red -> Green -> Blue -> Red around the "outside" of the circle, and goes to White in the center] then it is like picking a point on the colourwheel and then rotating the wheel whilst keeping the point in the same place - the colour underneath the pointer changes. Americans are used to having to adjust hue because their TV system is based on NTSC which doesn't describe hue specifically, but relationally iirc
Probably left you more confused ;o) Maybe someone else's reply will clarify more for you :o)
This is from my photoshop book:
"Think of hues as the colors you can see on a color wheel. In technical terms
hue is based on the wavelength of light reflected from an object, or
transmitted throught it. Saturation is the amount of gray in a color. The
higher the saturation, the lower the gray content -- and the more intense the
color. Brightness is a measure of the intensity of light in a color.
If you go into Control center > look & feel > background. choose color 1, it
opens up the dialog box. there is hsv(hue,saturation,brightness) and rgb
numbers listed towards the bottom.
On the color chart, if you pick a color(blue) and the pick a different shade
of blue that is horizontal to the first color you'll see the hue number
change but the saturation and brightness numbers remain the same.
If you pick a color directly vertical to the first color you'll change the
saturation, but not the hue..
Actually you can go from red to Pink(one side of the chart to the other), by
only changing the hues.
You should also be able to play with the hues in gimp, I'm not sure if you can
change a pictures' hue, but you can start out with a new project and change
the background color's hue, or just change the background color.
--
Franklin Maurer