col = ReadPixel(x, y)
yfrom the current output device and returns its color.
Please note: The color returned by this function can slightly
vary from the original color at this position. For example, if
you have a brush which is completely white (i.e. all pixels have
the color $FFFFFF). If you use
ReadPixel() now to read the color
of an arbitrary pixel from this brush, you will receive the color
$FFFFFF only if Hollywood runs on a 24-bit or 32-bit screen. If
Hollywood runs on a 16-bit screen, you will get the color $FCF8FC,
on a 15-bit screen you would receive $F8F8F8. This is because those
screens do not have 16.7 million colors but only 65536 (16-bit screens)
or 32768 (15-bit screens) respectively. You can use the function
GetRealColor() to find out which color represents the
specified color on the current screen.
If the current output device is the mask of a brush, then
ReadPixel() will return either 0 if the pixel is invisible or
1 if the pixel is visible.
If the current output device is an alpha channel of a brush,
ReadPixel() will return the transparency level of the
requested pixel which ranges from 0 (full transparency) to 255
CreateBrush(1, 320, 256) SelectBrush(1) SetFillStyle(#FILLCOLOR) Box(0, 0, 320, 256, #GREEN) a = ReadPixel(100, 100) EndSelect()The above code draws a green rectangle to brush 1 and reads the pixel at 100:100 from it. The variable a will receive the value of
#GREENbecause the whole brush is filled with green.