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Basics of Color - part 3 cont.


RGB can change the overall color cast of an image and corrects color balance problems. As seen below, the original has a red/pink cast to it. The second photo had the red hue decreased without any changes to the green or blue settings. The third photo left the red setting unchanged, while increasing the green and blue settings.
Too Pink Reduced Red Increased Green/Blue

Brightness and Contrast
Brightness lightens and darkens the entire image.
Contrast changes the amount of shading between areas (sharpen/blur), and makes colors appear more saturated. The original image below is very dark. Then second image attempts to brighten the entire image, but the image has now lost its contrast. The third image adds more contrast and gives a sharper image.
Note: Brightness in PSP5 uses different methods than PSP6. If you are using PSP6, use values 2 to 2.5 times greater or less than what you were using in PSP5.
Too Dark Brightened Contrasted

Highlight/Midtone/Shadow adjusts dark, middle and light values separately (tonal values). The first image is the original. The smoke makes it appear very dark and it lacks contrast. The second image the Shadows were decreased, the midtones slightly increased and the highlights greatly increased. This gives the photo a sharper/clearer image.
Original Corrected

Hue (tint): at values +/- 100 or at 0, the hue remains the same. At numbers in between the colors cycle around the color wheel.
Saturation (purity): at 0 the saturation remains the same, at +100 the saturation increases and the colors become very vivid, and at -100 the image becomes desaturated (grayscaled).
Lightness (brightness): at 0 the lightness remains the same, at +100 the colors go as close to white as they can get, and at -100 the colors go toward black.
The first photo is the original. The second photo the hue was decreased to add more green and take some of the blue out. In the third image the saturation was decreased to tone the color down some and remove some of the vividness of the red hue. In the final image the lightness was increased to add a little more highlight to the photo.
Original Corrected Hue Corrected Saturation Corrected Lightness

Gamma Correction changes the contrast and brightness of an image. The gamma cure has three elements which are red, green, and blue. These elements can be linked to change the contrast and brightness or unlinked to change the color balance (correct a strong color cast). When all three elements are at 1.00 the image is at its original state, increasing the values together will lighten the image and decreasing them together will darken it. The first image is the original and shows a strong red hue. In the second image, I unlinked the three elements and decreased the red hue, then pushed up the green and blue hues slightly. The image became a little too bright so I linked all three elements again and decreased them together to give more contrast to the image.
Too Red Corrected

Hue Map allows you to change individual colors in an image, as well as saturation and lightness. The colors can actually be replaced by other colors. If a color in the hue map control panel is not in your image, moving the slider will have no effect on the image.
Hue Map

COLOR CORRECTION - Previous Tutorial

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