Graphics File Formats(Windows的.BMP .CUR .ICO文件的格式，有范例)

parameter description

cred specifies the intensity of the red color field.
cgreen specifies the intensity of the green color field.
cblue specifies the intensity of the blue color field.

returns

the return value specifies the resultant rgb color.

comments

the intensity for each argument can range from 0 through 255. if all three
intensities are specified as zero, the result is black. if all three
intensities are specified as 255, the result is white.

comments

the rgb macro is defined in windows.h as follows:

#define rgb(r,g,b) ((colorref)(((byte)(r)|((word)(g)<<8))| \
(((dword)(byte)(b))<<16)))

see also

getbvalue, getgvalue, getrvalue, paletteindex, palettergb

==============================================================================
bitmapcoreinfo (3.0)

typedef struct tagbitmapcoreinfo { /* bmci */
bitmapcoreheader bmciheader;
rgbtriple bmcicolors[1];
} bitmapcoreinfo;

the bitmapcoreinfo structure fully defines the dimensions and color
information for a device-independent bitmap (dib). windows applications
should use the bitmapinfo structure instead of bitmapcoreinfo whenever
possible.

member description

bmciheader specifies a bitmapcoreheader structure that contains
information about the dimensions and color format of a dib.

bmcicolors specifies an array of rgbtriple structures that define the
colors in the bitmap.

comments

the bitmapcoreinfo structure describes the dimensions and colors of a bitmap.
it is followed immediately in memory by an array of bytes which define the
pixels of the bitmap. the bits in the array are packed together, but each
scan line must be zero-padded to end on a long boundary. segment boundaries,
however, can appear anywhere in the bitmap. the origin of the bitmap is the
lower-left corner.

the bcbitcount member of the bitmapcoreheader structure determines the number
of bits that define each pixel and the maximum number of colors in the
bitmap. this member may be set to any of the following values:

value meaning

1 the bitmap is monochrome, and the bmcicolors member must contain two
entries. each bit in the bitmap array represents a pixel. if the bit is
clear, the pixel is displayed with the color of the first entry in the
bmcicolors table. if the bit is set, the pixel has the color of the second
entry in the table.

4 the bitmap has a maximum of 16 colors, and the bmcicolors member
contains 16 entries. each pixel in the bitmap is represented by a four-bit
index into the color table.

for example, if the first byte in the bitmap is 0x1f, the byte represents two
pixels. the first pixel contains the color in the second table entry, and the
second pixel contains the color in the sixteenth table entry.

8 the bitmap has a maximum of 256 colors, and the bmcicolors member
contains 256 entries. in this case, each byte in the array represents a
single pixel.

24 the bitmap has a maximum of 2^24 colors. the bmcicolors member is
null, and each 3-byte sequence in the bitmap array represents the relative
intensities of red, green, and blue, respectively, of a pixel.

the colors in the bmcicolors table should appear in order of importance.

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