Lines Matching refs:grayscale

453     PNG_TRANSFORM_GRAY_TO_RGB   Expand grayscale samples
834 data.  For example, don't swap red and blue on grayscale data.
845 For example, 4 bit/pixel paletted or grayscale data will be returned
854 after each RRGGBB triplet.  Similarly, 8-bit or 16-bit grayscale data can
858 The following code transforms grayscale images of less than 8 to 8 bits,
861 grayscale images with bit depths of 2 or 4 or if there is a multiple-image
883 In the following table, the 01 means grayscale with depth<8, 31 means
1006 For some uses, you may want a grayscale image to be represented as
1013 Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
1040 will be silently converted to grayscale, using the green channel
1068 If you have a grayscale and you are using png_set_expand_depth(),
1191 This function can also be used to invert grayscale and gray-alpha images:
2214 data.  For example, don't swap red and blue on grayscale data.
2218 to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2
2725 of an image.  Filtering is enabled by default for RGB and grayscale