pset
Syntax
 int pset(int x, int y, int z, int v)
Arguments
 x
 An integer pixel xcoordinate in the output buffer.
 y
 An integer pixel ycoordinate in the output buffer.
 z
 An integer channel number in the range 0 to Z  1.
 v
 An integer value to be set for channel 'z'.
Return
 Returns the value of v, properly clamped to the range [0, 255] or [0, 0x8000], if the current pixel depth is 8 or 16 bits, respectively.
Description
 This function sets the value of one channel for a pixel in the output buffer to the properly clamped value of v. The pixel is at coordinates (x,y), and the channel to be set is given by 'z' (0 = red, 1 = green, 2 = blue, and 3 = alpha for the RGBA case).

 If the coordinates (x,y) are outside the current image (i.e., x < 0 or x >= (X)? or y < 0 or y >= (Y)?), or if z < 0 or z >= Z, then the output buffer is not changed.
Example
%ffp
ForEveryTile:
{
for (y=y_start; y<y_end; ++y)
{
for (x=x_start; x<x_end; ++x)
{
for (z=0; z<Z; ++z)
{
pset(x, y, z, 255); // set all (8bit) pixels to white!
}
}
}
return true;
}
Also see
 tset, t2set, pget
Comments
 Everyone can add his or her comments about his or her experiences with this function here. Tips for using it are welcome, too.