Open image. At top of screen, click IMAGE>MODE>RGB.
RGB photography is not as much a style of photography but a type of setting for editing the colours in an image. You may choose this setting selecting or editing the colours in an image. RGB is an acronym for Red Green Blue which refers to the colours making up an image.
red, green, blue
The option to adjust RGB Alpha values may be greyed out in the image editing software because the image does not have an alpha channel, which is needed to adjust transparency.
The RGB alpha channel in digital image processing is significant because it allows for transparency to be added to an image. This means that parts of the image can be made see-through, which is useful for creating overlays, blending images, and creating complex visual effects.
A gray level image is an image that contains only shades of gray (if it is a RGB image, than all its pixels satisfy R=G=B)
RGB is the color model used to display color on televisions and video monitors. It is a mixture of light, as opposed to a printed image which is a mixture of ink. It is more important to understand how RGB works, and when to use this color model.
Using 8-bit RGB color in digital image processing offers advantages such as smaller file sizes, faster processing speeds, and compatibility with a wide range of devices and software.
First open your photo and then goto the "Image" tab and select "Mode" and click "RGB"
RGB is usually the best and has the widest variety of colors
Either by using a palette (color map) or by using RGB values.
Pantone colours are industry standard inks for printing that guarantee color uniformity. An RGB image can not actually be printed until it is converted to CMYK. There is access to Pantone color libraries from within most image editing software, from the library you can choose the specific colour you are looking for.