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150  * whether we need a dithering cube set up for RGB images, or if we
543 * only do transformations on images where the file_gamma and screen_gamma
548 * are present in the tRNS array for palette images. We can't do it here
569 /* Expand paletted images to RGB, expand grayscale images of
603 /* Expand paletted images to RGB. */
617 /* Expand grayscale images of less than 8-bit depth to 8 bits. */
632 /* Expand grayscale images of less than 8-bit depth to 8 bits. */
1421 * To support RGB backgrounds for gray images we need:
2554 * large of png_color. This lets grayscale images be treated as
3490 * or RGB images. If your bit depth is 8, use gamma_table, if it