There are a few ways to convert an index image to RGB in Photoshop. One way is to use the ‘Image > Mode > RGB Color’ menu option. This will convert the image to RGB mode and display a color picker. Another way is to use the ‘Layer > New Adjustment Layer > Hue/Saturation..’ menu option.
This will open a dialog box where you can enter values for hue, saturation, and lightness. The ‘Colorize’ option must be checked for the changes to take effect. The last way is to use the ‘Image > Adjustments > Replace Color. This will open a dialog box where you can select a color to replace, and choose new colors for the image.
To convert an index image to RGB in Photoshop, you can use the ‘Image > Mode > RGB Color’ menu option, the ‘Layer > New Adjustment Layer > Hue/Saturation.’ menu option, or the ‘Image > Adjustments > Replace Color.