pickle wrote:
>There are such things as 24-bit greyscale? I always thought most stuff
>just used 8-bit for greyscale.
Yes. 8 bit greyscale is standard. Even a 24 bit video card will
not use more than 8 bits for greyscale. 8 bit is all that's necessary
for 256 shades of grey, since the video card will simply fire all 3
guns (red, green & blue) at the same level.
24 bit colour still uses 256 levels. But, it uses 8 bits for the
red gun, 8 for the green & 8 for the blue. (256 X 256 X 256 =
16.something million)
16 bit colour uses only 64 levels of fire for each gun. Though a 16
bit card will switch to 256 levels (8 bit) when in greyscale mode.
There may be some professional video cards for video and/or
graphic arts work that will use more than 256 levels. But, they're
not consumer products & you'd pay $$$ through the nose for them.
256 shades is quite subtle. Using PhotoShop, set the background
colour to red=128, green=128, blue=128. then create a new picture
with that as the background. Then set your foreground colour to
red=129, green=129, blue=129. Take your pencil or brush & draw a
picture or pattern... Save the picture, then set it as a desktop on a
machine with 24 bit colour... See if you can see your pattern?
Iechyd Da,
Andrew
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