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One blending mode in Photoshop which adds red, green, and blue channel values to the RGB values of the base color is the HUE and SATURATION mode.
By using blending modes u can add rgb values
Channel #3
In Photoshop, a document can be converted to, displayed in, and edited in any of the following color modes: Bitmap, Grayscale, Duotone, Indexed Color, RGB Color, CMYK Color, Lab Color, or Multichannel. This conversion is done primarily to take advantage of specific editing or output options. The availability of some Photoshop commands and options will vary depending on the current color mode of your document.
To convert a document to a different mode, make a selection from the Image > Mode sub-menu. If a mode is dimmed on the menu and you want to make it available, you need to convert the file to a different mode as an intermediary step first. For example, to convert a file to Duotone mode, you need to put it into Grayscale mode first. The most common mode that Photoshop users work in is RGB Color.
Some mode conversions can cause noticeable color shifts. For example, if you convert a file from RGB Color mode (the mode used by computer displays) to CMYK Color mode (which contains fewer colors than RGB but is necessary for commercial printing), printable colors in the image will be substituted for any RGB colors that are outside the printable gamut (range). The fewer times you convert a file, the better, as the color data is altered with each conversion. Some conversions fatten layers, such as a conversion to Indexed Color, Multichannel, or Bitmap mode. Other conversions (such as from RGB to CMYK) give you the option to preserve layers via a Don’t Flatten button in an alert dialog that pops up.
Digital cameras and medium- to low-end scanners produce images in the default color mode of RGB. We recommend keeping your files in that mode for faster editing, and to preserve access to all the Photoshop filters. In fact, most desktop color inkjet printers, especially those that use six or more ink colors, are designed to accept RGB files.
And are the main colors of light, which means that all the other colors are a combination of one of these colors (RGB).These color formula uses transmitted light to show the colors used.
Edit it by "Hue & Saturation" mode.
The blending mode specified in the options bar controls how pixels in the image are affected by a painting or editing tool. Think in terms of the following colors when visualizing a blending mode’s effect:
The base color is the original color in the image.
The blend color is the color being applied with the painting or editing tool.
The result color is the color resulting from the blend.
by using hue and saturation
by using hue and saturation we can add red ,blue and green color
