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2. Help : How to reduce colors for saving a JPEG as PNG

   en.wikipedia.org/wiki/Help:How_to_reduce_colors...

   If you merely convert a JPEG to a PNG, your graphics program will likely produce one of these true-color PNGs, and make a large file. You should convert such PNGs to "indexed" or "palette-based" mode before you upload them. Most raster graphics editors will let you convert from true-color mode (also called "full color" or "RGB"), and let you ...

3. Indexed color - Wikipedia

   en.wikipedia.org/wiki/Indexed_color

   A 2-bit indexed color image. The color of each pixel is represented by a number; each number (the index) corresponds to a color in the color table (the palette).. In computing, indexed color is a technique to manage digital images' colors in a limited fashion, in order to save computer memory and file storage, while speeding up display refresh and file transfers.

4. Image conversion - Wikipedia

   en.wikipedia.org/wiki/Image_conversion

   Data in a RAW-file is structured according to the Bayer filter's pattern in cameras that use a single image sensor. Debayering, the process of obtaining bitmap data from a RAW-image is always a lossy operation. [citation needed] In addition, some downsampling is always performed, again reducing image information.

5. Image color transfer - Wikipedia

   en.wikipedia.org/wiki/Image_color_transfer

   The image modification process is sometimes called color transfer or, when grayscale images are involved, brightness transfer function (BTF); it may also be called photometric camera calibration or radiometric camera calibration. The term image color transfer is a bit of a misnomer since most common algorithms transfer both color and shading ...

6. Grayscale - Wikipedia

   en.wikipedia.org/wiki/Grayscale

   Here is an example of color channel splitting of a full RGB color image. The column at left shows the isolated color channels in natural colors, while at right there are their grayscale equivalences: Composition of RGB from three grayscale images. The reverse is also possible: to build a full-color image from their separate grayscale channels.

7. Color quantization - Wikipedia

   en.wikipedia.org/wiki/Color_quantization

   Many image file formats support indexed color. A whole-image palette typically selects 256 "representative" colors for the entire image, where each pixel references any one of the colors in the palette, as in the GIF and PNG file formats. A block palette typically selects 2 or 4 colors for each block of 4x4 pixels, used in BTC, CCC, S2TC, and S3TC.