What we can do right now is to adjust the values of each pixel in the image using this curve. Notice a spike in the high values on the right, and a small gap at the brightestВ values. In the main area of the dialog I am presented with a linear curve, behind which I will see a histogram of the value data for the entire image (showing the amount of each value across my image). I could also use the drop down for вЂњChannelвЂќ to change to red, green or blue curves if I wanted to. We can see that I start off with the curve for the Value of the pixels. Opening up my Curves dialog shows me theВ following: IвЂ™ll be using this wonderful image by Eric from Flickr. So letвЂ™s leave your pixel alone for the time being, and actually have a look at the Curves dialog. If we were to change the values of each channel, but kept ratio the same between Red, Green, and Blue, then we would keep the same color and just lighten or darken the pixel by someВ amount. The RGB components that mix into your final blue pixel.ДЄs you can see, there is more blue than anything else (it is a blue-ish pixel after all), followed by green, then a dash of red. So now letвЂ™s see what goes into making up yourВ pixel: If all three channels have the same value, then you will get a shade of gray (128,128,128 would be a middle gray color forВ instance). If all three channels have a value of 0 - then the resulting color will be pureВ black. If all three channels have a value of 255 - then the resulting color will be pure white. In GIMP (currently at 8-bit), that means that each RGB color can have a value from 0 - 255, and combining these three colors with varying levels in each channel will result in all the colors you can see in yourВ image. Remember, each pixel is represented by a combination of 3 colors: Red, Green, and Blue. So letвЂ™s investigate what goes into making your pixel. Your Pixels and You В¶ДЇirst thereвЂ™s something you need to consider if you havenвЂ™t before, and thatвЂ™s what goes into representing a colored pixel on yourВ screen.ДЄaand thereвЂ™s your pixel.

Even though GIMP is used to demonstrate these ideas, the principles are generic to just about any RGB curveВ adjustments. Instead, we are going to take a look at the use of the Curves tool in GIMP. Volumes have been written on color and I am in no ways even remotely qualified to speak on it. We associate colors with certain moods, places, feelings, and memories (consciously orВ not).

From the warm glow of a sunny summer afternoon to a cool refreshing early evening in fall. Color has this amazing ability to evoke emotional responses from us.

Gimp replace color