When the colors are all filled in, the layers will look like this:Ĭlick on the foreground color and enter the values for full red as follows: Then make a fourth layer for the white balance target color.
To make the red, green, and blue images in Photoshop, create an image about the shape of your format. Bring that picture into Rawdigger and look at the EXIF WB coefficients and the raw values to see how well you did.Read the UniWB target RGB values from the output cells, and fill the test target with that color in Photoshop.Enter the desired raw value for the UniWB target.Enter the color space gamma into the spreadsheet.Enter the average values of the red, green, and blue raw pixels into the appropriate columns in the spreadsheet. In any RGB color space within the gamut of your monitor for which you know the gamma (sRGB is probably the safest choice), make three exposures: one at R=255, G=0, B=0, one at R=0, G=255, B=0, one at R=0, G=0, B=255.There’s a detailed explanation at the end of this page. Here’s an “.xls” version if your version of Excel is old: OneStepUniWB This spreadsheet (Right-click on it and select “Save target as” to download it.Excel, or another spreadsheet program that can operate with Excel files.Rawdigger, or another program that lets you look at the average values of the ref, green, and blue pixels in raw files.Photoshop, or another image editing program that lets you create images with arbitrary colors.The setup described in the preceding page.
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