BMP RGB565

http://atlc.sourceforge.net/bmp.html#_toc381201084 

• when this field is equal to 16.

the bitmap has a maximum of 2^16 colors. if the compression field of the bitmap file is set to bi_rgb, the palette field does not contain any entries. each word in the bitmap array represents a single pixel. the relative intensities of red, green, and blue are represented with 5 bits for each color component. the value for blue is in the least significant 5 bits, followed by 5 bits each for green and red, respectively. the most significant bit is not used.

if the compression field of the bitmap file is set to bi_bitfields, the palette field contains three dword color masks that specify the red, green, and blue components, respectively, of each pixel. each word in the bitmap array represents a single pixel.

windows nt specific: when the compression field is set to bi_bitfields, bits set in each dword mask must be contiguous and should not overlap the bits of another mask. all the bits in the pixel do not have to be used.

windows 95 specific: when the compression field is set to bi_bitfields, windows 95 supports only the following 16bpp color masks: a 5-5-5 16-bit image, where the blue mask is 0x001f, the green mask is 0x03e0, and the red mask is 0x7c00; and a 5-6-5 16-bit image, where the blue mask is 0x001f, the green mask is 0x07e0, and the red mask is 0xf800.

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原文链接：blog.csdn.net/xushx_bigbear/article/details/17091429