fluorescent lamps color correct
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Mercury-vapor lamp
A mercury-vapor lamp is a gas discharge lamp which uses mercury in an excited state to produce light. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from ultraviolet radiation, and a convenient mounting for the fused quartz arc tube.
Mercury vapor lamps (and their relatives) are often used because they are relatively efficient. Phosphor coated bulbs offer better color rendition than either high- or low-pressure sodium vapor lamps. Mercury vapor lamps also offer a very long lifetime, as well as intense lighting for several applications.
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How to Correct Color Balance in Paint Shop Pro
Instructions
Difficulty: Moderately Easy Step1
The original image with a serious color balance problem.
Take your photographs. If possible, use the three-point lighting system, setting a key light, a fill light and a back light on the subject. Take multiple photographs of the subject from different angles with lighting modifications.
Step2
Import your photographs into Paint Shop Pro. Determine what sort of color balance problem your images are presenting. In the grand majority of cases, photographs taken in low light or indoors will be too yellow. There may also be an excess of red or blue, especially in the background.
Step3
Open the image you would like to correct. If the subject looks fine, but the background is the wrong color, use the Magic Wand Tool to select the background only. Leave the subject unselected. This generally requires that you experiment with the Tolerance in the Tool Options Palette above your image. Hold down the shift key, and left click an area to add it to your selection. Hold down the control key, and left click on an area to remove it from the selection. It's all right to select some of the subject, just as long as the selected areas do not contain the colors you plan to remove. Done properly, this selection will enable you to leave the colors in your subject bright and clear while removing all undesirable colors from the background.
Step4
The image with the background color balance corrected. Note how the color in the subject has been preserved.
Click Adjust, then choose the "Hue and Saturation" button. Under presets in the dialog box, select Factory Defaults. Examine your image to see what undesirable color casts are appearing in your image. If the cast looks orange, for example, then select Yellows in the Edit drop-down box and pull down the Saturation as far as it can reasonably go. Then select Reds in the Edit drop-down box and bring down the Saturation for that value as much as possible. If you still see a pink color cast, bring down the Saturation of the Magentas, and if you see a bluish color cast, bring down the Blues and/or Cyans. Look in the image preview window, and proof your image by selecting the button which looks like an eye. Your background should look grey, and the subject should still be bright and colorful. Click OK.
Step5
The finished image with brightness and contrast enhanced.
Right click on the image with the Magic Wand to deselect the image. Click Adjust > Brightness and Contrast. Experiment with the numbers in the two fields, with autoproof selected, until the image looks right in the window. Click OK. Crop your image if desired.
Step6
Save your image with a new file name in order to preserve the original for future editing.
