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Contents 1 Definition 2 Parameters 3 Returns 4 Errors 5 Notes

Definition

INT grayscale ( <INT fileID> , <INT graphID> , <BYTE method> )

This will convert the specified graphic by using the specified method; see notes for the details.

Parameters

INT fileID	- The fileID of the file that holds the graphics.
INT graphID	- The graphID of the graphic to convert.
BYTE method	- The method used (see notes).

Returns

INT

-1	- Invalid graphic.
1	- Success.

Errors

Unsupported color depth

- The graphic's color depth is not 16bit.

Notes

The exact formula is:

c = 0.3 * oldpixel_r + 0.59 * oldpixel_g + 0.11 * oldpixel_b

Method 0:

for every pixel:
    newpixel_rgb = (c,c,c)

Method 1:

for every pixel:
    newpixel_rgb = (c,0,0)

Method 2:

for every pixel:
    newpixel_rgb = (0,c,0)

Method 3:

for every pixel:
    newpixel_rgb = (0,0,c)

Method 4:

for every pixel:
    newpixel_rgb = (c,c,0)

Method 5:

for every pixel:
    newpixel_rgb = (c,0,c)

Method 6:

for every pixel:
    newpixel_rgb = (0,c,c)

Other methodnumbers:

for every pixel:
    newpixel_rgb = oldpixel_rgb

Note that rgbscale(0,map,1,1,1) = grayscale(0,map,0).

Graphical effects Functions

• Blur() • Grayscale() • Rgbscale() •