PNG (Portable Network Graphic) is a bitmapped format with a lossless compression algorithm. Developed to surpass its predecessor GIF, this format is used for palette-based images, grayscale images with or without alpha channel, and full-color non-palette-based RGB. Some PNG files can use the indexed colored mode, and the other, the RGB mode, and there comes the necessity to convert indexed color or monochrome PNG to RGB, or vice versa. Index color offers a wider color range producing 8-bit images with a palette of up to 256 colors. Index color has very limited editing capabilities, and this is the main reason to convert an indexed color PNG to RGB. RGB color model stands for three names of colors – red, green, and blue. These three colors are mixed together to produce a broad array of various colors. The main purpose of RGB color model is for displaying images on different electronic devices – computers, television, etc. The theory of the RGB color model is based on human perception of colors. ImageConverter Plus supports all conversion types of the PNG images. You can use our image converter to save RGB, indexed-color, grayscale, and bitmap-mode images in the PNG format.